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[doc, 6/n] invoke.texi: split debugging options into programmer vs developer sections
- From: Sandra Loosemore <sandra at codesourcery dot com>
- To: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Sat, 16 Jan 2016 21:11:53 -0700
- Subject: [doc, 6/n] invoke.texi: split debugging options into programmer vs developer sections
- Authentication-results: sourceware.org; auth=none
- References: <5692EE28 dot 1070502 at codesourcery dot com>
This is the last planned part of my series to try to make it easier for
users to find information about command-line options (although as I've
been going through this chapter I've been finding places that need
copy-editing or technical corrections, which I'll handle separately).
In this part, I've split the options relating to debugging GCC itself
into a new section, separate from the one about producing debuggable code.
Here's the list of options remaining in the "Debugging Options" section:
@gccoptlist{-g -g@var{level} -gcoff -gdwarf-@var{version} @gol
-ggdb -grecord-gcc-switches -gno-record-gcc-switches @gol
-gstabs -gstabs+ -gstrict-dwarf -gno-strict-dwarf @gol
-gvms -gxcoff -gxcoff+ -gz@r{[}=@var{type}@r{]} @gol
-fdebug-prefix-map=@var{old}=@var{new} -fdebug-types-section @gol
-feliminate-dwarf2-dups -fno-eliminate-unused-debug-types @gol
-femit-struct-debug-baseonly -femit-struct-debug-reduced @gol
-femit-struct-debug-detailed@r{[}=@var{spec-list}@r{]} @gol
-feliminate-unused-debug-symbols -femit-class-debug-always @gol
-fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
-fvar-tracking -fvar-tracking-assignments}
And here's the list in the new "GCC Developer Options" section:
@gccoptlist{-d@var{letters} -dumpspecs -dumpmachine -dumpversion @gol
-fchecking -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
-fdisable-ipa-@var{pass_name} @gol
-fdisable-rtl-@var{pass_name} @gol
-fdisable-rtl-@var{pass-name}=@var{range-list} @gol
-fdisable-tree-@var{pass_name} @gol
-fdisable-tree-@var{pass-name}=@var{range-list} @gol
-fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links @gol
-fdump-translation-unit@r{[}-@var{n}@r{]} @gol
-fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
-fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
-fdump-passes @gol
-fdump-rtl-@var{pass} -fdump-rtl-@var{pass}=@var{filename} @gol
-fdump-statistics @gol
-fdump-tree-all @gol
-fdump-tree-original@r{[}-@var{n}@r{]} @gol
-fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
-fdump-tree-cfg -fdump-tree-alias @gol
-fdump-tree-ch @gol
-fdump-tree-ssa@r{[}-@var{n}@r{]} -fdump-tree-pre@r{[}-@var{n}@r{]} @gol
-fdump-tree-ccp@r{[}-@var{n}@r{]} -fdump-tree-dce@r{[}-@var{n}@r{]} @gol
-fdump-tree-gimple@r{[}-raw@r{]} @gol
-fdump-tree-dom@r{[}-@var{n}@r{]} @gol
-fdump-tree-dse@r{[}-@var{n}@r{]} @gol
-fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
-fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
-fdump-tree-backprop@r{[}-@var{n}@r{]} @gol
-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
-fdump-tree-nrv -fdump-tree-vect @gol
-fdump-tree-sink @gol
-fdump-tree-sra@r{[}-@var{n}@r{]} @gol
-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
-fdump-tree-fre@r{[}-@var{n}@r{]} @gol
-fdump-tree-vtable-verify @gol
-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
-fdump-tree-split-paths@r{[}-@var{n}@r{]} @gol
-fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
-fdump-final-insns=@var{file} @gol
-fcompare-debug@r{[}=@var{opts}@r{]} -fcompare-debug-second @gol
-fenable-@var{kind}-@var{pass} @gol
-fenable-@var{kind}-@var{pass}=@var{range-list} @gol
-fira-verbose=@var{n} @gol
-flto-report -flto-report-wpa -fmem-report-wpa @gol
-fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report @gol
-fopt-info -fopt-info-@var{options}@r{[}=@var{file}@r{]} @gol
-fprofile-report @gol
-frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
-fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
-fstats -fstack-usage -ftime-report @gol
-fvar-tracking-assignments-toggle -gtoggle @gol
-print-file-name=@var{library} -print-libgcc-file-name @gol
-print-multi-directory -print-multi-lib -print-multi-os-directory @gol
-print-prog-name=@var{program} -print-search-dirs -Q @gol
-print-sysroot -print-sysroot-headers-suffix @gol
-save-temps -save-temps=cwd -save-temps=obj -time@r{[}=@var{file}@r{]}}
I've generally not touched the option descriptions, just moved them
around. The exception is that I incorporated some of the material from
the -g description into the section introduction, and also added a
pointer to -Og to the discussion about the interaction between -O and -g
(having previously run into PR62225 myself).
I'll commit this in a couple days unless I hear complaints meanwhile.
-Sandra
2016-01-16 Sandra Loosemore <sandra@codesourcery.com>
gcc/
* doc/invoke.texi (Invoking GCC): Add new section to menu.
(Option Summary): Update to reflect new section and moved options.
(C++ Dialect Options): Move -fstats to new section.
(Debugging Options): Move all dump, statistics, and other GCC
developer options to new section. Rewrite section introduction
and re-order remaining options to put the more basic ones first.
(Optimization Options): Move -fira-verbose and -flto-report* to
new section.
(Developer Options): New section incorporating moved options.
* doc/cppopts.texi (-dM): Update cross-reference.
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 232475)
+++ gcc/doc/invoke.texi (working copy)
@@ -138,7 +138,7 @@ only one of these two forms, whichever o
* Diagnostic Message Formatting Options:: Controlling how diagnostics should
be formatted.
* Warning Options:: How picky should the compiler be?
-* Debugging Options:: Symbol tables, measurements, and debugging dumps.
+* Debugging Options:: Producing debuggable code.
* Optimize Options:: How much optimization?
* Instrumentation Options:: Enabling profiling and extra run-time error checking.
* Preprocessor Options:: Controlling header files and macro definitions.
@@ -149,6 +149,8 @@ only one of these two forms, whichever o
Where to find the compiler executable files.
* Code Gen Options:: Specifying conventions for function calls, data layout
and register usage.
+* Developer Options:: Printing GCC configuration info, statistics, and
+ debugging dumps.
* Submodel Options:: Target-specific options, such as compiling for a
specific processor variant.
* Spec Files:: How to pass switches to sub-processes.
@@ -199,7 +201,7 @@ in the following sections.
-fno-optional-diags -fpermissive @gol
-fno-pretty-templates @gol
-frepo -fno-rtti -fsized-deallocation @gol
--fstats -ftemplate-backtrace-limit=@var{n} @gol
+-ftemplate-backtrace-limit=@var{n} @gol
-ftemplate-depth=@var{n} @gol
-fno-threadsafe-statics -fuse-cxa-atexit @gol
-fno-weak -nostdinc++ @gol
@@ -313,71 +315,18 @@ Objective-C and Objective-C++ Dialects}.
-Wdeclaration-after-statement -Wpointer-sign}
@item Debugging Options
-@xref{Debugging Options,,Options for Debugging Your Program or GCC}.
-@gccoptlist{-d@var{letters} -dumpspecs -dumpmachine -dumpversion @gol
--fchecking -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
--fdisable-ipa-@var{pass_name} @gol
--fdisable-rtl-@var{pass_name} @gol
--fdisable-rtl-@var{pass-name}=@var{range-list} @gol
--fdisable-tree-@var{pass_name} @gol
--fdisable-tree-@var{pass-name}=@var{range-list} @gol
--fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links @gol
--fdump-translation-unit@r{[}-@var{n}@r{]} @gol
--fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
--fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
--fdump-passes @gol
--fdump-statistics @gol
--fdump-tree-all @gol
--fdump-tree-original@r{[}-@var{n}@r{]} @gol
--fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
--fdump-tree-cfg -fdump-tree-alias @gol
--fdump-tree-ch @gol
--fdump-tree-ssa@r{[}-@var{n}@r{]} -fdump-tree-pre@r{[}-@var{n}@r{]} @gol
--fdump-tree-ccp@r{[}-@var{n}@r{]} -fdump-tree-dce@r{[}-@var{n}@r{]} @gol
--fdump-tree-gimple@r{[}-raw@r{]} @gol
--fdump-tree-dom@r{[}-@var{n}@r{]} @gol
--fdump-tree-dse@r{[}-@var{n}@r{]} @gol
--fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
--fdump-tree-backprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-nrv -fdump-tree-vect @gol
--fdump-tree-sink @gol
--fdump-tree-sra@r{[}-@var{n}@r{]} @gol
--fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
--fdump-tree-fre@r{[}-@var{n}@r{]} @gol
--fdump-tree-vtable-verify @gol
--fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
--fdump-tree-split-paths@r{[}-@var{n}@r{]} @gol
--fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
--fdump-final-insns=@var{file} @gol
--fcompare-debug@r{[}=@var{opts}@r{]} -fcompare-debug-second @gol
--feliminate-dwarf2-dups -fno-eliminate-unused-debug-types @gol
--feliminate-unused-debug-symbols -femit-class-debug-always @gol
--fenable-@var{kind}-@var{pass} @gol
--fenable-@var{kind}-@var{pass}=@var{range-list} @gol
--fdebug-types-section -fmem-report-wpa @gol
--fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report @gol
--fopt-info @gol
--fopt-info-@var{options}@r{[}=@var{file}@r{]} @gol
--fprofile-report @gol
--frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
--fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
--fstack-usage -ftime-report -fvar-tracking @gol
--fvar-tracking-assignments -fvar-tracking-assignments-toggle @gol
--g -g@var{level} -gtoggle -gcoff -gdwarf-@var{version} @gol
+@xref{Debugging Options,,Options for Debugging Your Program}.
+@gccoptlist{-g -g@var{level} -gcoff -gdwarf-@var{version} @gol
-ggdb -grecord-gcc-switches -gno-record-gcc-switches @gol
-gstabs -gstabs+ -gstrict-dwarf -gno-strict-dwarf @gol
-gvms -gxcoff -gxcoff+ -gz@r{[}=@var{type}@r{]} @gol
--fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
--fdebug-prefix-map=@var{old}=@var{new} @gol
+-fdebug-prefix-map=@var{old}=@var{new} -fdebug-types-section @gol
+-feliminate-dwarf2-dups -fno-eliminate-unused-debug-types @gol
-femit-struct-debug-baseonly -femit-struct-debug-reduced @gol
-femit-struct-debug-detailed@r{[}=@var{spec-list}@r{]} @gol
--print-file-name=@var{library} -print-libgcc-file-name @gol
--print-multi-directory -print-multi-lib -print-multi-os-directory @gol
--print-prog-name=@var{program} -print-search-dirs -Q @gol
--print-sysroot -print-sysroot-headers-suffix @gol
--save-temps -save-temps=cwd -save-temps=obj -time@r{[}=@var{file}@r{]}}
+-feliminate-unused-debug-symbols -femit-class-debug-always @gol
+-fno-merge-debug-strings -fno-dwarf2-cfi-asm @gol
+-fvar-tracking -fvar-tracking-assignments}
@item Optimization Options
@xref{Optimize Options,,Options that Control Optimization}.
@@ -407,14 +356,14 @@ Objective-C and Objective-C++ Dialects}.
-fira-algorithm=@var{algorithm} @gol
-fira-region=@var{region} -fira-hoist-pressure @gol
-fira-loop-pressure -fno-ira-share-save-slots @gol
--fno-ira-share-spill-slots -fira-verbose=@var{n} @gol
+-fno-ira-share-spill-slots @gol
-fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute @gol
-fivopts -fkeep-inline-functions -fkeep-static-functions @gol
-fkeep-static-consts -flive-range-shrinkage @gol
-floop-block -floop-interchange -floop-strip-mine @gol
-floop-unroll-and-jam -floop-nest-optimize @gol
-floop-parallelize-all -flra-remat -flto -flto-compression-level @gol
--flto-partition=@var{alg} -flto-report -flto-report-wpa -fmerge-all-constants @gol
+-flto-partition=@var{alg} -fmerge-all-constants @gol
-fmerge-constants -fmodulo-sched -fmodulo-sched-allow-regmoves @gol
-fmove-loop-invariants -fno-branch-count-reg @gol
-fno-defer-pop -fno-function-cse -fno-guess-branch-probability @gol
@@ -548,6 +497,64 @@ Objective-C and Objective-C++ Dialects}.
-fvisibility=@r{[}default@r{|}internal@r{|}hidden@r{|}protected@r{]} @gol
-fstrict-volatile-bitfields -fsync-libcalls}
+@item Developer Options
+@xref{Developer Options,,GCC Developer Options}
+@gccoptlist{-d@var{letters} -dumpspecs -dumpmachine -dumpversion @gol
+-fchecking -fdbg-cnt-list -fdbg-cnt=@var{counter-value-list} @gol
+-fdisable-ipa-@var{pass_name} @gol
+-fdisable-rtl-@var{pass_name} @gol
+-fdisable-rtl-@var{pass-name}=@var{range-list} @gol
+-fdisable-tree-@var{pass_name} @gol
+-fdisable-tree-@var{pass-name}=@var{range-list} @gol
+-fdump-noaddr -fdump-unnumbered -fdump-unnumbered-links @gol
+-fdump-translation-unit@r{[}-@var{n}@r{]} @gol
+-fdump-class-hierarchy@r{[}-@var{n}@r{]} @gol
+-fdump-ipa-all -fdump-ipa-cgraph -fdump-ipa-inline @gol
+-fdump-passes @gol
+-fdump-rtl-@var{pass} -fdump-rtl-@var{pass}=@var{filename} @gol
+-fdump-statistics @gol
+-fdump-tree-all @gol
+-fdump-tree-original@r{[}-@var{n}@r{]} @gol
+-fdump-tree-optimized@r{[}-@var{n}@r{]} @gol
+-fdump-tree-cfg -fdump-tree-alias @gol
+-fdump-tree-ch @gol
+-fdump-tree-ssa@r{[}-@var{n}@r{]} -fdump-tree-pre@r{[}-@var{n}@r{]} @gol
+-fdump-tree-ccp@r{[}-@var{n}@r{]} -fdump-tree-dce@r{[}-@var{n}@r{]} @gol
+-fdump-tree-gimple@r{[}-raw@r{]} @gol
+-fdump-tree-dom@r{[}-@var{n}@r{]} @gol
+-fdump-tree-dse@r{[}-@var{n}@r{]} @gol
+-fdump-tree-phiprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-phiopt@r{[}-@var{n}@r{]} @gol
+-fdump-tree-backprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-nrv -fdump-tree-vect @gol
+-fdump-tree-sink @gol
+-fdump-tree-sra@r{[}-@var{n}@r{]} @gol
+-fdump-tree-forwprop@r{[}-@var{n}@r{]} @gol
+-fdump-tree-fre@r{[}-@var{n}@r{]} @gol
+-fdump-tree-vtable-verify @gol
+-fdump-tree-vrp@r{[}-@var{n}@r{]} @gol
+-fdump-tree-split-paths@r{[}-@var{n}@r{]} @gol
+-fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
+-fdump-final-insns=@var{file} @gol
+-fcompare-debug@r{[}=@var{opts}@r{]} -fcompare-debug-second @gol
+-fenable-@var{kind}-@var{pass} @gol
+-fenable-@var{kind}-@var{pass}=@var{range-list} @gol
+-fira-verbose=@var{n} @gol
+-flto-report -flto-report-wpa -fmem-report-wpa @gol
+-fmem-report -fpre-ipa-mem-report -fpost-ipa-mem-report @gol
+-fopt-info -fopt-info-@var{options}@r{[}=@var{file}@r{]} @gol
+-fprofile-report @gol
+-frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
+-fsel-sched-verbose -fsel-sched-dump-cfg -fsel-sched-pipelining-verbose @gol
+-fstats -fstack-usage -ftime-report @gol
+-fvar-tracking-assignments-toggle -gtoggle @gol
+-print-file-name=@var{library} -print-libgcc-file-name @gol
+-print-multi-directory -print-multi-lib -print-multi-os-directory @gol
+-print-prog-name=@var{program} -print-search-dirs -Q @gol
+-print-sysroot -print-sysroot-headers-suffix @gol
+-save-temps -save-temps=cwd -save-temps=obj -time@r{[}=@var{file}@r{]}}
+
@item Machine-Dependent Options
@xref{Submodel Options,,Machine-Dependent Options}.
@c This list is ordered alphanumerically by subsection name.
@@ -2433,11 +2440,6 @@ to make deallocation faster. Enabled by
@option{-std=c++14} and above. The flag @option{-Wsized-deallocation}
warns about places that might want to add a definition.
-@item -fstats
-@opindex fstats
-Emit statistics about front-end processing at the end of the compilation.
-This information is generally only useful to the G++ development team.
-
@item -fstrict-enums
@opindex fstrict-enums
Allow the compiler to optimize using the assumption that a value of
@@ -5694,12 +5696,28 @@ attribute.
@end table
@node Debugging Options
-@section Options for Debugging Your Program or GCC
+@section Options for Debugging Your Program
@cindex options, debugging
@cindex debugging information options
-GCC has various special options that are used for debugging
-either your program or GCC:
+To tell GCC to emit extra information for use by a debugger, in almost
+all cases you need only to add @option{-g} to your other options.
+
+GCC allows you to use @option{-g} with
+@option{-O}. The shortcuts taken by optimized code may occasionally
+be surprising: some variables you declared may not exist
+at all; flow of control may briefly move where you did not expect it;
+some statements may not be executed because they compute constant
+results or their values are already at hand; some statements may
+execute in different places because they have been moved out of loops.
+Nevertheless it is possible to debug optimized output. This makes
+it reasonable to use the optimizer for programs that might have bugs.
+
+If you are not using some other optimization option, consider
+using @option{-Og} (@pxref{Optimize Options}) with @option{-g}.
+With no @option{-O} option at all, some compiler passes that collect
+information useful for debugging do not run at all, so that
+@option{-Og} may result in a better debugging experience.
@table @gcctabopt
@item -g
@@ -5716,28 +5734,6 @@ refuse to read the program. If you want
to generate the extra information, use @option{-gstabs+}, @option{-gstabs},
@option{-gxcoff+}, @option{-gxcoff}, or @option{-gvms} (see below).
-GCC allows you to use @option{-g} with
-@option{-O}. The shortcuts taken by optimized code may occasionally
-produce surprising results: some variables you declared may not exist
-at all; flow of control may briefly move where you did not expect it;
-some statements may not be executed because they compute constant
-results or their values are already at hand; some statements may
-execute in different places because they have been moved out of loops.
-
-Nevertheless it proves possible to debug optimized output. This makes
-it reasonable to use the optimizer for programs that might have bugs.
-
-The following options are useful when GCC is generated with the
-capability for more than one debugging format.
-
-@item -gsplit-dwarf
-@opindex gsplit-dwarf
-Separate as much dwarf debugging information as possible into a
-separate output file with the extension .dwo. This option allows
-the build system to avoid linking files with debug information. To
-be useful, this option requires a debugger capable of reading .dwo
-files.
-
@item -ggdb
@opindex ggdb
Produce debugging information for use by GDB@. This means to use the
@@ -5745,15 +5741,17 @@ most expressive format available (DWARF
if neither of those are supported), including GDB extensions if at all
possible.
-@item -gpubnames
-@opindex gpubnames
-Generate dwarf .debug_pubnames and .debug_pubtypes sections.
+@item -gdwarf-@var{version}
+@opindex gdwarf-@var{version}
+Produce debugging information in DWARF format (if that is supported).
+The value of @var{version} may be either 2, 3, 4 or 5; the default version
+for most targets is 4. DWARF Version 5 is only experimental.
-@item -ggnu-pubnames
-@opindex ggnu-pubnames
-Generate .debug_pubnames and .debug_pubtypes sections in a format
-suitable for conversion into a GDB@ index. This option is only useful
-with a linker that can produce GDB@ index version 7.
+Note that with DWARF Version 2, some ports require and always
+use some non-conflicting DWARF 3 extensions in the unwind tables.
+
+Version 4 may require GDB 7.0 and @option{-fvar-tracking-assignments}
+for maximum benefit.
@item -gstabs
@opindex gstabs
@@ -5763,31 +5761,6 @@ systems. On MIPS, Alpha and System V Re
produces stabs debugging output that is not understood by DBX or SDB@.
On System V Release 4 systems this option requires the GNU assembler.
-@item -feliminate-unused-debug-symbols
-@opindex feliminate-unused-debug-symbols
-Produce debugging information in stabs format (if that is supported),
-for only symbols that are actually used.
-
-@item -femit-class-debug-always
-@opindex femit-class-debug-always
-Instead of emitting debugging information for a C++ class in only one
-object file, emit it in all object files using the class. This option
-should be used only with debuggers that are unable to handle the way GCC
-normally emits debugging information for classes because using this
-option increases the size of debugging information by as much as a
-factor of two.
-
-@item -fdebug-types-section
-@opindex fdebug-types-section
-@opindex fno-debug-types-section
-When using DWARF Version 4 or higher, type DIEs can be put into
-their own @code{.debug_types} section instead of making them part of the
-@code{.debug_info} section. It is more efficient to put them in a separate
-comdat sections since the linker can then remove duplicates.
-But not all DWARF consumers support @code{.debug_types} sections yet
-and on some objects @code{.debug_types} produces larger instead of smaller
-debugging information.
-
@item -gstabs+
@opindex gstabs+
Produce debugging information in stabs format (if that is supported),
@@ -5814,55 +5787,6 @@ use of these extensions is likely to mak
refuse to read the program, and may cause assemblers other than the GNU
assembler (GAS) to fail with an error.
-@item -gdwarf-@var{version}
-@opindex gdwarf-@var{version}
-Produce debugging information in DWARF format (if that is supported).
-The value of @var{version} may be either 2, 3, 4 or 5; the default version
-for most targets is 4. DWARF Version 5 is only experimental.
-
-Note that with DWARF Version 2, some ports require and always
-use some non-conflicting DWARF 3 extensions in the unwind tables.
-
-Version 4 may require GDB 7.0 and @option{-fvar-tracking-assignments}
-for maximum benefit.
-
-@item -grecord-gcc-switches
-@opindex grecord-gcc-switches
-This switch causes the command-line options used to invoke the
-compiler that may affect code generation to be appended to the
-DW_AT_producer attribute in DWARF debugging information. The options
-are concatenated with spaces separating them from each other and from
-the compiler version. See also @option{-frecord-gcc-switches} for another
-way of storing compiler options into the object file. This is the default.
-
-@item -gno-record-gcc-switches
-@opindex gno-record-gcc-switches
-Disallow appending command-line options to the DW_AT_producer attribute
-in DWARF debugging information.
-
-@item -gstrict-dwarf
-@opindex gstrict-dwarf
-Disallow using extensions of later DWARF standard version than selected
-with @option{-gdwarf-@var{version}}. On most targets using non-conflicting
-DWARF extensions from later standard versions is allowed.
-
-@item -gno-strict-dwarf
-@opindex gno-strict-dwarf
-Allow using extensions of later DWARF standard version than selected with
-@option{-gdwarf-@var{version}}.
-
-@item -gz@r{[}=@var{type}@r{]}
-@opindex gz
-Produce compressed debug sections in DWARF format, if that is supported.
-If @var{type} is not given, the default type depends on the capabilities
-of the assembler and linker used. @var{type} may be one of
-@samp{none} (don't compress debug sections), @samp{zlib} (use zlib
-compression in ELF gABI format), or @samp{zlib-gnu} (use zlib
-compression in traditional GNU format). If the linker doesn't support
-writing compressed debug sections, the option is rejected. Otherwise,
-if the assembler does not support them, @option{-gz} is silently ignored
-when producing object files.
-
@item -gvms
@opindex gvms
Produce debugging information in Alpha/VMS debug format (if that is
@@ -5897,69 +5821,122 @@ debug format is long obsolete, but the o
Instead use an additional @option{-g@var{level}} option to change the
debug level for DWARF.
-@item -gtoggle
-@opindex gtoggle
-Turn off generation of debug info, if leaving out this option
-generates it, or turn it on at level 2 otherwise. The position of this
-argument in the command line does not matter; it takes effect after all
-other options are processed, and it does so only once, no matter how
-many times it is given. This is mainly intended to be used with
-@option{-fcompare-debug}.
+@item -feliminate-unused-debug-symbols
+@opindex feliminate-unused-debug-symbols
+Produce debugging information in stabs format (if that is supported),
+for only symbols that are actually used.
-@item -fchecking
-@opindex fchecking
-@opindex fno-checking
-Enable internal consistency checking. The default depends on
-the compiler configuration.
+@item -femit-class-debug-always
+@opindex femit-class-debug-always
+Instead of emitting debugging information for a C++ class in only one
+object file, emit it in all object files using the class. This option
+should be used only with debuggers that are unable to handle the way GCC
+normally emits debugging information for classes because using this
+option increases the size of debugging information by as much as a
+factor of two.
-@item -fdump-final-insns@r{[}=@var{file}@r{]}
-@opindex fdump-final-insns
-Dump the final internal representation (RTL) to @var{file}. If the
-optional argument is omitted (or if @var{file} is @code{.}), the name
-of the dump file is determined by appending @code{.gkd} to the
-compilation output file name.
+@item -fno-merge-debug-strings
+@opindex fmerge-debug-strings
+@opindex fno-merge-debug-strings
+Direct the linker to not merge together strings in the debugging
+information that are identical in different object files. Merging is
+not supported by all assemblers or linkers. Merging decreases the size
+of the debug information in the output file at the cost of increasing
+link processing time. Merging is enabled by default.
-@item -fcompare-debug@r{[}=@var{opts}@r{]}
-@opindex fcompare-debug
-@opindex fno-compare-debug
-If no error occurs during compilation, run the compiler a second time,
-adding @var{opts} and @option{-fcompare-debug-second} to the arguments
-passed to the second compilation. Dump the final internal
-representation in both compilations, and print an error if they differ.
+@item -fdebug-prefix-map=@var{old}=@var{new}
+@opindex fdebug-prefix-map
+When compiling files in directory @file{@var{old}}, record debugging
+information describing them as in @file{@var{new}} instead.
-If the equal sign is omitted, the default @option{-gtoggle} is used.
+@item -fvar-tracking
+@opindex fvar-tracking
+Run variable tracking pass. It computes where variables are stored at each
+position in code. Better debugging information is then generated
+(if the debugging information format supports this information).
-The environment variable @env{GCC_COMPARE_DEBUG}, if defined, non-empty
-and nonzero, implicitly enables @option{-fcompare-debug}. If
-@env{GCC_COMPARE_DEBUG} is defined to a string starting with a dash,
-then it is used for @var{opts}, otherwise the default @option{-gtoggle}
-is used.
+It is enabled by default when compiling with optimization (@option{-Os},
+@option{-O}, @option{-O2}, @dots{}), debugging information (@option{-g}) and
+the debug info format supports it.
-@option{-fcompare-debug=}, with the equal sign but without @var{opts},
-is equivalent to @option{-fno-compare-debug}, which disables the dumping
-of the final representation and the second compilation, preventing even
-@env{GCC_COMPARE_DEBUG} from taking effect.
+@item -fvar-tracking-assignments
+@opindex fvar-tracking-assignments
+@opindex fno-var-tracking-assignments
+Annotate assignments to user variables early in the compilation and
+attempt to carry the annotations over throughout the compilation all the
+way to the end, in an attempt to improve debug information while
+optimizing. Use of @option{-gdwarf-4} is recommended along with it.
-To verify full coverage during @option{-fcompare-debug} testing, set
-@env{GCC_COMPARE_DEBUG} to say @option{-fcompare-debug-not-overridden},
-which GCC rejects as an invalid option in any actual compilation
-(rather than preprocessing, assembly or linking). To get just a
-warning, setting @env{GCC_COMPARE_DEBUG} to @samp{-w%n-fcompare-debug
-not overridden} will do.
+It can be enabled even if var-tracking is disabled, in which case
+annotations are created and maintained, but discarded at the end.
+By default, this flag is enabled together with @option{-fvar-tracking},
+except when selective scheduling is enabled.
-@item -fcompare-debug-second
-@opindex fcompare-debug-second
-This option is implicitly passed to the compiler for the second
-compilation requested by @option{-fcompare-debug}, along with options to
-silence warnings, and omitting other options that would cause
-side-effect compiler outputs to files or to the standard output. Dump
-files and preserved temporary files are renamed so as to contain the
-@code{.gk} additional extension during the second compilation, to avoid
-overwriting those generated by the first.
+@item -gsplit-dwarf
+@opindex gsplit-dwarf
+Separate as much dwarf debugging information as possible into a
+separate output file with the extension .dwo. This option allows
+the build system to avoid linking files with debug information. To
+be useful, this option requires a debugger capable of reading .dwo
+files.
-When this option is passed to the compiler driver, it causes the
-@emph{first} compilation to be skipped, which makes it useful for little
-other than debugging the compiler proper.
+@item -gpubnames
+@opindex gpubnames
+Generate dwarf .debug_pubnames and .debug_pubtypes sections.
+
+@item -ggnu-pubnames
+@opindex ggnu-pubnames
+Generate .debug_pubnames and .debug_pubtypes sections in a format
+suitable for conversion into a GDB@ index. This option is only useful
+with a linker that can produce GDB@ index version 7.
+
+@item -fdebug-types-section
+@opindex fdebug-types-section
+@opindex fno-debug-types-section
+When using DWARF Version 4 or higher, type DIEs can be put into
+their own @code{.debug_types} section instead of making them part of the
+@code{.debug_info} section. It is more efficient to put them in a separate
+comdat sections since the linker can then remove duplicates.
+But not all DWARF consumers support @code{.debug_types} sections yet
+and on some objects @code{.debug_types} produces larger instead of smaller
+debugging information.
+
+@item -grecord-gcc-switches
+@opindex grecord-gcc-switches
+This switch causes the command-line options used to invoke the
+compiler that may affect code generation to be appended to the
+DW_AT_producer attribute in DWARF debugging information. The options
+are concatenated with spaces separating them from each other and from
+the compiler version. See also @option{-frecord-gcc-switches} for another
+way of storing compiler options into the object file. This is the default.
+
+@item -gno-record-gcc-switches
+@opindex gno-record-gcc-switches
+Disallow appending command-line options to the DW_AT_producer attribute
+in DWARF debugging information.
+
+@item -gstrict-dwarf
+@opindex gstrict-dwarf
+Disallow using extensions of later DWARF standard version than selected
+with @option{-gdwarf-@var{version}}. On most targets using non-conflicting
+DWARF extensions from later standard versions is allowed.
+
+@item -gno-strict-dwarf
+@opindex gno-strict-dwarf
+Allow using extensions of later DWARF standard version than selected with
+@option{-gdwarf-@var{version}}.
+
+@item -gz@r{[}=@var{type}@r{]}
+@opindex gz
+Produce compressed debug sections in DWARF format, if that is supported.
+If @var{type} is not given, the default type depends on the capabilities
+of the assembler and linker used. @var{type} may be one of
+@samp{none} (don't compress debug sections), @samp{zlib} (use zlib
+compression in ELF gABI format), or @samp{zlib-gnu} (use zlib
+compression in traditional GNU format). If the linker doesn't support
+writing compressed debug sections, the option is rejected. Otherwise,
+if the assembler does not support them, @option{-gz} is silently ignored
+when producing object files.
@item -feliminate-dwarf2-dups
@opindex feliminate-dwarf2-dups
@@ -6042,1164 +6019,12 @@ The default is @option{-femit-struct-deb
This option works only with DWARF 2.
-@item -fno-merge-debug-strings
-@opindex fmerge-debug-strings
-@opindex fno-merge-debug-strings
-Direct the linker to not merge together strings in the debugging
-information that are identical in different object files. Merging is
-not supported by all assemblers or linkers. Merging decreases the size
-of the debug information in the output file at the cost of increasing
-link processing time. Merging is enabled by default.
-
-@item -fdebug-prefix-map=@var{old}=@var{new}
-@opindex fdebug-prefix-map
-When compiling files in directory @file{@var{old}}, record debugging
-information describing them as in @file{@var{new}} instead.
-
@item -fno-dwarf2-cfi-asm
@opindex fdwarf2-cfi-asm
@opindex fno-dwarf2-cfi-asm
Emit DWARF 2 unwind info as compiler generated @code{.eh_frame} section
instead of using GAS @code{.cfi_*} directives.
-@item -Q
-@opindex Q
-Makes the compiler print out each function name as it is compiled, and
-print some statistics about each pass when it finishes.
-
-@item -ftime-report
-@opindex ftime-report
-Makes the compiler print some statistics about the time consumed by each
-pass when it finishes.
-
-@item -fmem-report
-@opindex fmem-report
-Makes the compiler print some statistics about permanent memory
-allocation when it finishes.
-
-@item -fmem-report-wpa
-@opindex fmem-report-wpa
-Makes the compiler print some statistics about permanent memory
-allocation for the WPA phase only.
-
-@item -fpre-ipa-mem-report
-@opindex fpre-ipa-mem-report
-@item -fpost-ipa-mem-report
-@opindex fpost-ipa-mem-report
-Makes the compiler print some statistics about permanent memory
-allocation before or after interprocedural optimization.
-
-@item -fprofile-report
-@opindex fprofile-report
-Makes the compiler print some statistics about consistency of the
-(estimated) profile and effect of individual passes.
-
-@item -fstack-usage
-@opindex fstack-usage
-Makes the compiler output stack usage information for the program, on a
-per-function basis. The filename for the dump is made by appending
-@file{.su} to the @var{auxname}. @var{auxname} is generated from the name of
-the output file, if explicitly specified and it is not an executable,
-otherwise it is the basename of the source file. An entry is made up
-of three fields:
-
-@itemize
-@item
-The name of the function.
-@item
-A number of bytes.
-@item
-One or more qualifiers: @code{static}, @code{dynamic}, @code{bounded}.
-@end itemize
-
-The qualifier @code{static} means that the function manipulates the stack
-statically: a fixed number of bytes are allocated for the frame on function
-entry and released on function exit; no stack adjustments are otherwise made
-in the function. The second field is this fixed number of bytes.
-
-The qualifier @code{dynamic} means that the function manipulates the stack
-dynamically: in addition to the static allocation described above, stack
-adjustments are made in the body of the function, for example to push/pop
-arguments around function calls. If the qualifier @code{bounded} is also
-present, the amount of these adjustments is bounded at compile time and
-the second field is an upper bound of the total amount of stack used by
-the function. If it is not present, the amount of these adjustments is
-not bounded at compile time and the second field only represents the
-bounded part.
-
-@item -fdbg-cnt-list
-@opindex fdbg-cnt-list
-Print the name and the counter upper bound for all debug counters.
-
-
-@item -fdbg-cnt=@var{counter-value-list}
-@opindex fdbg-cnt
-Set the internal debug counter upper bound. @var{counter-value-list}
-is a comma-separated list of @var{name}:@var{value} pairs
-which sets the upper bound of each debug counter @var{name} to @var{value}.
-All debug counters have the initial upper bound of @code{UINT_MAX};
-thus @code{dbg_cnt} returns true always unless the upper bound
-is set by this option.
-For example, with @option{-fdbg-cnt=dce:10,tail_call:0},
-@code{dbg_cnt(dce)} returns true only for first 10 invocations.
-
-@item -fenable-@var{kind}-@var{pass}
-@itemx -fdisable-@var{kind}-@var{pass}=@var{range-list}
-@opindex fdisable-
-@opindex fenable-
-
-This is a set of options that are used to explicitly disable/enable
-optimization passes. These options are intended for use for debugging GCC.
-Compiler users should use regular options for enabling/disabling
-passes instead.
-
-@table @gcctabopt
-
-@item -fdisable-ipa-@var{pass}
-Disable IPA pass @var{pass}. @var{pass} is the pass name. If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1.
-
-@item -fdisable-rtl-@var{pass}
-@itemx -fdisable-rtl-@var{pass}=@var{range-list}
-Disable RTL pass @var{pass}. @var{pass} is the pass name. If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1. @var{range-list} is a
-comma-separated list of function ranges or assembler names. Each range is a number
-pair separated by a colon. The range is inclusive in both ends. If the range
-is trivial, the number pair can be simplified as a single number. If the
-function's call graph node's @var{uid} falls within one of the specified ranges,
-the @var{pass} is disabled for that function. The @var{uid} is shown in the
-function header of a dump file, and the pass names can be dumped by using
-option @option{-fdump-passes}.
-
-@item -fdisable-tree-@var{pass}
-@itemx -fdisable-tree-@var{pass}=@var{range-list}
-Disable tree pass @var{pass}. See @option{-fdisable-rtl} for the description of
-option arguments.
-
-@item -fenable-ipa-@var{pass}
-Enable IPA pass @var{pass}. @var{pass} is the pass name. If the same pass is
-statically invoked in the compiler multiple times, the pass name should be
-appended with a sequential number starting from 1.
-
-@item -fenable-rtl-@var{pass}
-@itemx -fenable-rtl-@var{pass}=@var{range-list}
-Enable RTL pass @var{pass}. See @option{-fdisable-rtl} for option argument
-description and examples.
-
-@item -fenable-tree-@var{pass}
-@itemx -fenable-tree-@var{pass}=@var{range-list}
-Enable tree pass @var{pass}. See @option{-fdisable-rtl} for the description
-of option arguments.
-
-@end table
-
-Here are some examples showing uses of these options.
-
-@smallexample
-
-# disable ccp1 for all functions
- -fdisable-tree-ccp1
-# disable complete unroll for function whose cgraph node uid is 1
- -fenable-tree-cunroll=1
-# disable gcse2 for functions at the following ranges [1,1],
-# [300,400], and [400,1000]
-# disable gcse2 for functions foo and foo2
- -fdisable-rtl-gcse2=foo,foo2
-# disable early inlining
- -fdisable-tree-einline
-# disable ipa inlining
- -fdisable-ipa-inline
-# enable tree full unroll
- -fenable-tree-unroll
-
-@end smallexample
-
-@item -d@var{letters}
-@itemx -fdump-rtl-@var{pass}
-@itemx -fdump-rtl-@var{pass}=@var{filename}
-@opindex d
-@opindex fdump-rtl-@var{pass}
-Says to make debugging dumps during compilation at times specified by
-@var{letters}. This is used for debugging the RTL-based passes of the
-compiler. The file names for most of the dumps are made by appending
-a pass number and a word to the @var{dumpname}, and the files are
-created in the directory of the output file. In case of
-@option{=@var{filename}} option, the dump is output on the given file
-instead of the pass numbered dump files. Note that the pass number is
-assigned as passes are registered into the pass manager. Most passes
-are registered in the order that they will execute and for these passes
-the number corresponds to the pass execution order. However, passes
-registered by plugins, passes specific to compilation targets, or
-passes that are otherwise registered after all the other passes are
-numbered higher than a pass named "final", even if they are executed
-earlier. @var{dumpname} is generated from the name of the output
-file if explicitly specified and not an executable, otherwise it is
-the basename of the source file. These switches may have different
-effects when @option{-E} is used for preprocessing.
-
-Debug dumps can be enabled with a @option{-fdump-rtl} switch or some
-@option{-d} option @var{letters}. Here are the possible
-letters for use in @var{pass} and @var{letters}, and their meanings:
-
-@table @gcctabopt
-
-@item -fdump-rtl-alignments
-@opindex fdump-rtl-alignments
-Dump after branch alignments have been computed.
-
-@item -fdump-rtl-asmcons
-@opindex fdump-rtl-asmcons
-Dump after fixing rtl statements that have unsatisfied in/out constraints.
-
-@item -fdump-rtl-auto_inc_dec
-@opindex fdump-rtl-auto_inc_dec
-Dump after auto-inc-dec discovery. This pass is only run on
-architectures that have auto inc or auto dec instructions.
-
-@item -fdump-rtl-barriers
-@opindex fdump-rtl-barriers
-Dump after cleaning up the barrier instructions.
-
-@item -fdump-rtl-bbpart
-@opindex fdump-rtl-bbpart
-Dump after partitioning hot and cold basic blocks.
-
-@item -fdump-rtl-bbro
-@opindex fdump-rtl-bbro
-Dump after block reordering.
-
-@item -fdump-rtl-btl1
-@itemx -fdump-rtl-btl2
-@opindex fdump-rtl-btl2
-@opindex fdump-rtl-btl2
-@option{-fdump-rtl-btl1} and @option{-fdump-rtl-btl2} enable dumping
-after the two branch
-target load optimization passes.
-
-@item -fdump-rtl-bypass
-@opindex fdump-rtl-bypass
-Dump after jump bypassing and control flow optimizations.
-
-@item -fdump-rtl-combine
-@opindex fdump-rtl-combine
-Dump after the RTL instruction combination pass.
-
-@item -fdump-rtl-compgotos
-@opindex fdump-rtl-compgotos
-Dump after duplicating the computed gotos.
-
-@item -fdump-rtl-ce1
-@itemx -fdump-rtl-ce2
-@itemx -fdump-rtl-ce3
-@opindex fdump-rtl-ce1
-@opindex fdump-rtl-ce2
-@opindex fdump-rtl-ce3
-@option{-fdump-rtl-ce1}, @option{-fdump-rtl-ce2}, and
-@option{-fdump-rtl-ce3} enable dumping after the three
-if conversion passes.
-
-@item -fdump-rtl-cprop_hardreg
-@opindex fdump-rtl-cprop_hardreg
-Dump after hard register copy propagation.
-
-@item -fdump-rtl-csa
-@opindex fdump-rtl-csa
-Dump after combining stack adjustments.
-
-@item -fdump-rtl-cse1
-@itemx -fdump-rtl-cse2
-@opindex fdump-rtl-cse1
-@opindex fdump-rtl-cse2
-@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
-the two common subexpression elimination passes.
-
-@item -fdump-rtl-dce
-@opindex fdump-rtl-dce
-Dump after the standalone dead code elimination passes.
-
-@item -fdump-rtl-dbr
-@opindex fdump-rtl-dbr
-Dump after delayed branch scheduling.
-
-@item -fdump-rtl-dce1
-@itemx -fdump-rtl-dce2
-@opindex fdump-rtl-dce1
-@opindex fdump-rtl-dce2
-@option{-fdump-rtl-dce1} and @option{-fdump-rtl-dce2} enable dumping after
-the two dead store elimination passes.
-
-@item -fdump-rtl-eh
-@opindex fdump-rtl-eh
-Dump after finalization of EH handling code.
-
-@item -fdump-rtl-eh_ranges
-@opindex fdump-rtl-eh_ranges
-Dump after conversion of EH handling range regions.
-
-@item -fdump-rtl-expand
-@opindex fdump-rtl-expand
-Dump after RTL generation.
-
-@item -fdump-rtl-fwprop1
-@itemx -fdump-rtl-fwprop2
-@opindex fdump-rtl-fwprop1
-@opindex fdump-rtl-fwprop2
-@option{-fdump-rtl-fwprop1} and @option{-fdump-rtl-fwprop2} enable
-dumping after the two forward propagation passes.
-
-@item -fdump-rtl-gcse1
-@itemx -fdump-rtl-gcse2
-@opindex fdump-rtl-gcse1
-@opindex fdump-rtl-gcse2
-@option{-fdump-rtl-gcse1} and @option{-fdump-rtl-gcse2} enable dumping
-after global common subexpression elimination.
-
-@item -fdump-rtl-init-regs
-@opindex fdump-rtl-init-regs
-Dump after the initialization of the registers.
-
-@item -fdump-rtl-initvals
-@opindex fdump-rtl-initvals
-Dump after the computation of the initial value sets.
-
-@item -fdump-rtl-into_cfglayout
-@opindex fdump-rtl-into_cfglayout
-Dump after converting to cfglayout mode.
-
-@item -fdump-rtl-ira
-@opindex fdump-rtl-ira
-Dump after iterated register allocation.
-
-@item -fdump-rtl-jump
-@opindex fdump-rtl-jump
-Dump after the second jump optimization.
-
-@item -fdump-rtl-loop2
-@opindex fdump-rtl-loop2
-@option{-fdump-rtl-loop2} enables dumping after the rtl
-loop optimization passes.
-
-@item -fdump-rtl-mach
-@opindex fdump-rtl-mach
-Dump after performing the machine dependent reorganization pass, if that
-pass exists.
-
-@item -fdump-rtl-mode_sw
-@opindex fdump-rtl-mode_sw
-Dump after removing redundant mode switches.
-
-@item -fdump-rtl-rnreg
-@opindex fdump-rtl-rnreg
-Dump after register renumbering.
-
-@item -fdump-rtl-outof_cfglayout
-@opindex fdump-rtl-outof_cfglayout
-Dump after converting from cfglayout mode.
-
-@item -fdump-rtl-peephole2
-@opindex fdump-rtl-peephole2
-Dump after the peephole pass.
-
-@item -fdump-rtl-postreload
-@opindex fdump-rtl-postreload
-Dump after post-reload optimizations.
-
-@item -fdump-rtl-pro_and_epilogue
-@opindex fdump-rtl-pro_and_epilogue
-Dump after generating the function prologues and epilogues.
-
-@item -fdump-rtl-sched1
-@itemx -fdump-rtl-sched2
-@opindex fdump-rtl-sched1
-@opindex fdump-rtl-sched2
-@option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2} enable dumping
-after the basic block scheduling passes.
-
-@item -fdump-rtl-ree
-@opindex fdump-rtl-ree
-Dump after sign/zero extension elimination.
-
-@item -fdump-rtl-seqabstr
-@opindex fdump-rtl-seqabstr
-Dump after common sequence discovery.
-
-@item -fdump-rtl-shorten
-@opindex fdump-rtl-shorten
-Dump after shortening branches.
-
-@item -fdump-rtl-sibling
-@opindex fdump-rtl-sibling
-Dump after sibling call optimizations.
-
-@item -fdump-rtl-split1
-@itemx -fdump-rtl-split2
-@itemx -fdump-rtl-split3
-@itemx -fdump-rtl-split4
-@itemx -fdump-rtl-split5
-@opindex fdump-rtl-split1
-@opindex fdump-rtl-split2
-@opindex fdump-rtl-split3
-@opindex fdump-rtl-split4
-@opindex fdump-rtl-split5
-These options enable dumping after five rounds of
-instruction splitting.
-
-@item -fdump-rtl-sms
-@opindex fdump-rtl-sms
-Dump after modulo scheduling. This pass is only run on some
-architectures.
-
-@item -fdump-rtl-stack
-@opindex fdump-rtl-stack
-Dump after conversion from GCC's ``flat register file'' registers to the
-x87's stack-like registers. This pass is only run on x86 variants.
-
-@item -fdump-rtl-subreg1
-@itemx -fdump-rtl-subreg2
-@opindex fdump-rtl-subreg1
-@opindex fdump-rtl-subreg2
-@option{-fdump-rtl-subreg1} and @option{-fdump-rtl-subreg2} enable dumping after
-the two subreg expansion passes.
-
-@item -fdump-rtl-unshare
-@opindex fdump-rtl-unshare
-Dump after all rtl has been unshared.
-
-@item -fdump-rtl-vartrack
-@opindex fdump-rtl-vartrack
-Dump after variable tracking.
-
-@item -fdump-rtl-vregs
-@opindex fdump-rtl-vregs
-Dump after converting virtual registers to hard registers.
-
-@item -fdump-rtl-web
-@opindex fdump-rtl-web
-Dump after live range splitting.
-
-@item -fdump-rtl-regclass
-@itemx -fdump-rtl-subregs_of_mode_init
-@itemx -fdump-rtl-subregs_of_mode_finish
-@itemx -fdump-rtl-dfinit
-@itemx -fdump-rtl-dfinish
-@opindex fdump-rtl-regclass
-@opindex fdump-rtl-subregs_of_mode_init
-@opindex fdump-rtl-subregs_of_mode_finish
-@opindex fdump-rtl-dfinit
-@opindex fdump-rtl-dfinish
-These dumps are defined but always produce empty files.
-
-@item -da
-@itemx -fdump-rtl-all
-@opindex da
-@opindex fdump-rtl-all
-Produce all the dumps listed above.
-
-@item -dA
-@opindex dA
-Annotate the assembler output with miscellaneous debugging information.
-
-@item -dD
-@opindex dD
-Dump all macro definitions, at the end of preprocessing, in addition to
-normal output.
-
-@item -dH
-@opindex dH
-Produce a core dump whenever an error occurs.
-
-@item -dp
-@opindex dp
-Annotate the assembler output with a comment indicating which
-pattern and alternative is used. The length of each instruction is
-also printed.
-
-@item -dP
-@opindex dP
-Dump the RTL in the assembler output as a comment before each instruction.
-Also turns on @option{-dp} annotation.
-
-@item -dx
-@opindex dx
-Just generate RTL for a function instead of compiling it. Usually used
-with @option{-fdump-rtl-expand}.
-@end table
-
-@item -fdump-noaddr
-@opindex fdump-noaddr
-When doing debugging dumps, suppress address output. This makes it more
-feasible to use diff on debugging dumps for compiler invocations with
-different compiler binaries and/or different
-text / bss / data / heap / stack / dso start locations.
-
-@item -freport-bug
-@opindex freport-bug
-Collect and dump debug information into temporary file if ICE in C/C++
-compiler occured.
-
-@item -fdump-unnumbered
-@opindex fdump-unnumbered
-When doing debugging dumps, suppress instruction numbers and address output.
-This makes it more feasible to use diff on debugging dumps for compiler
-invocations with different options, in particular with and without
-@option{-g}.
-
-@item -fdump-unnumbered-links
-@opindex fdump-unnumbered-links
-When doing debugging dumps (see @option{-d} option above), suppress
-instruction numbers for the links to the previous and next instructions
-in a sequence.
-
-@item -fdump-translation-unit @r{(C++ only)}
-@itemx -fdump-translation-unit-@var{options} @r{(C++ only)}
-@opindex fdump-translation-unit
-Dump a representation of the tree structure for the entire translation
-unit to a file. The file name is made by appending @file{.tu} to the
-source file name, and the file is created in the same directory as the
-output file. If the @samp{-@var{options}} form is used, @var{options}
-controls the details of the dump as described for the
-@option{-fdump-tree} options.
-
-@item -fdump-class-hierarchy @r{(C++ only)}
-@itemx -fdump-class-hierarchy-@var{options} @r{(C++ only)}
-@opindex fdump-class-hierarchy
-Dump a representation of each class's hierarchy and virtual function
-table layout to a file. The file name is made by appending
-@file{.class} to the source file name, and the file is created in the
-same directory as the output file. If the @samp{-@var{options}} form
-is used, @var{options} controls the details of the dump as described
-for the @option{-fdump-tree} options.
-
-@item -fdump-ipa-@var{switch}
-@opindex fdump-ipa
-Control the dumping at various stages of inter-procedural analysis
-language tree to a file. The file name is generated by appending a
-switch specific suffix to the source file name, and the file is created
-in the same directory as the output file. The following dumps are
-possible:
-
-@table @samp
-@item all
-Enables all inter-procedural analysis dumps.
-
-@item cgraph
-Dumps information about call-graph optimization, unused function removal,
-and inlining decisions.
-
-@item inline
-Dump after function inlining.
-
-@end table
-
-@item -fdump-passes
-@opindex fdump-passes
-Dump the list of optimization passes that are turned on and off by
-the current command-line options.
-
-@item -fdump-statistics-@var{option}
-@opindex fdump-statistics
-Enable and control dumping of pass statistics in a separate file. The
-file name is generated by appending a suffix ending in
-@samp{.statistics} to the source file name, and the file is created in
-the same directory as the output file. If the @samp{-@var{option}}
-form is used, @samp{-stats} causes counters to be summed over the
-whole compilation unit while @samp{-details} dumps every event as
-the passes generate them. The default with no option is to sum
-counters for each function compiled.
-
-@item -fdump-tree-@var{switch}
-@itemx -fdump-tree-@var{switch}-@var{options}
-@itemx -fdump-tree-@var{switch}-@var{options}=@var{filename}
-@opindex fdump-tree
-Control the dumping at various stages of processing the intermediate
-language tree to a file. The file name is generated by appending a
-switch-specific suffix to the source file name, and the file is
-created in the same directory as the output file. In case of
-@option{=@var{filename}} option, the dump is output on the given file
-instead of the auto named dump files. If the @samp{-@var{options}}
-form is used, @var{options} is a list of @samp{-} separated options
-which control the details of the dump. Not all options are applicable
-to all dumps; those that are not meaningful are ignored. The
-following options are available
-
-@table @samp
-@item address
-Print the address of each node. Usually this is not meaningful as it
-changes according to the environment and source file. Its primary use
-is for tying up a dump file with a debug environment.
-@item asmname
-If @code{DECL_ASSEMBLER_NAME} has been set for a given decl, use that
-in the dump instead of @code{DECL_NAME}. Its primary use is ease of
-use working backward from mangled names in the assembly file.
-@item slim
-When dumping front-end intermediate representations, inhibit dumping
-of members of a scope or body of a function merely because that scope
-has been reached. Only dump such items when they are directly reachable
-by some other path.
-
-When dumping pretty-printed trees, this option inhibits dumping the
-bodies of control structures.
-
-When dumping RTL, print the RTL in slim (condensed) form instead of
-the default LISP-like representation.
-@item raw
-Print a raw representation of the tree. By default, trees are
-pretty-printed into a C-like representation.
-@item details
-Enable more detailed dumps (not honored by every dump option). Also
-include information from the optimization passes.
-@item stats
-Enable dumping various statistics about the pass (not honored by every dump
-option).
-@item blocks
-Enable showing basic block boundaries (disabled in raw dumps).
-@item graph
-For each of the other indicated dump files (@option{-fdump-rtl-@var{pass}}),
-dump a representation of the control flow graph suitable for viewing with
-GraphViz to @file{@var{file}.@var{passid}.@var{pass}.dot}. Each function in
-the file is pretty-printed as a subgraph, so that GraphViz can render them
-all in a single plot.
-
-This option currently only works for RTL dumps, and the RTL is always
-dumped in slim form.
-@item vops
-Enable showing virtual operands for every statement.
-@item lineno
-Enable showing line numbers for statements.
-@item uid
-Enable showing the unique ID (@code{DECL_UID}) for each variable.
-@item verbose
-Enable showing the tree dump for each statement.
-@item eh
-Enable showing the EH region number holding each statement.
-@item scev
-Enable showing scalar evolution analysis details.
-@item optimized
-Enable showing optimization information (only available in certain
-passes).
-@item missed
-Enable showing missed optimization information (only available in certain
-passes).
-@item note
-Enable other detailed optimization information (only available in
-certain passes).
-@item =@var{filename}
-Instead of an auto named dump file, output into the given file
-name. The file names @file{stdout} and @file{stderr} are treated
-specially and are considered already open standard streams. For
-example,
-
-@smallexample
-gcc -O2 -ftree-vectorize -fdump-tree-vect-blocks=foo.dump
- -fdump-tree-pre=stderr file.c
-@end smallexample
-
-outputs vectorizer dump into @file{foo.dump}, while the PRE dump is
-output on to @file{stderr}. If two conflicting dump filenames are
-given for the same pass, then the latter option overrides the earlier
-one.
-
-@item split-paths
-@opindex fdump-tree-split-paths
-Dump each function after splitting paths to loop backedges. The file
-name is made by appending @file{.split-paths} to the source file name.
-
-@item all
-Turn on all options, except @option{raw}, @option{slim}, @option{verbose}
-and @option{lineno}.
-
-@item optall
-Turn on all optimization options, i.e., @option{optimized},
-@option{missed}, and @option{note}.
-@end table
-
-The following tree dumps are possible:
-@table @samp
-
-@item original
-@opindex fdump-tree-original
-Dump before any tree based optimization, to @file{@var{file}.original}.
-
-@item optimized
-@opindex fdump-tree-optimized
-Dump after all tree based optimization, to @file{@var{file}.optimized}.
-
-@item gimple
-@opindex fdump-tree-gimple
-Dump each function before and after the gimplification pass to a file. The
-file name is made by appending @file{.gimple} to the source file name.
-
-@item cfg
-@opindex fdump-tree-cfg
-Dump the control flow graph of each function to a file. The file name is
-made by appending @file{.cfg} to the source file name.
-
-@item ch
-@opindex fdump-tree-ch
-Dump each function after copying loop headers. The file name is made by
-appending @file{.ch} to the source file name.
-
-@item ssa
-@opindex fdump-tree-ssa
-Dump SSA related information to a file. The file name is made by appending
-@file{.ssa} to the source file name.
-
-@item alias
-@opindex fdump-tree-alias
-Dump aliasing information for each function. The file name is made by
-appending @file{.alias} to the source file name.
-
-@item ccp
-@opindex fdump-tree-ccp
-Dump each function after CCP@. The file name is made by appending
-@file{.ccp} to the source file name.
-
-@item storeccp
-@opindex fdump-tree-storeccp
-Dump each function after STORE-CCP@. The file name is made by appending
-@file{.storeccp} to the source file name.
-
-@item pre
-@opindex fdump-tree-pre
-Dump trees after partial redundancy elimination. The file name is made
-by appending @file{.pre} to the source file name.
-
-@item fre
-@opindex fdump-tree-fre
-Dump trees after full redundancy elimination. The file name is made
-by appending @file{.fre} to the source file name.
-
-@item copyprop
-@opindex fdump-tree-copyprop
-Dump trees after copy propagation. The file name is made
-by appending @file{.copyprop} to the source file name.
-
-@item store_copyprop
-@opindex fdump-tree-store_copyprop
-Dump trees after store copy-propagation. The file name is made
-by appending @file{.store_copyprop} to the source file name.
-
-@item dce
-@opindex fdump-tree-dce
-Dump each function after dead code elimination. The file name is made by
-appending @file{.dce} to the source file name.
-
-@item sra
-@opindex fdump-tree-sra
-Dump each function after performing scalar replacement of aggregates. The
-file name is made by appending @file{.sra} to the source file name.
-
-@item sink
-@opindex fdump-tree-sink
-Dump each function after performing code sinking. The file name is made
-by appending @file{.sink} to the source file name.
-
-@item dom
-@opindex fdump-tree-dom
-Dump each function after applying dominator tree optimizations. The file
-name is made by appending @file{.dom} to the source file name.
-
-@item dse
-@opindex fdump-tree-dse
-Dump each function after applying dead store elimination. The file
-name is made by appending @file{.dse} to the source file name.
-
-@item phiopt
-@opindex fdump-tree-phiopt
-Dump each function after optimizing PHI nodes into straightline code. The file
-name is made by appending @file{.phiopt} to the source file name.
-
-@item backprop
-@opindex fdump-tree-backprop
-Dump each function after back-propagating use information up the definition
-chain. The file name is made by appending @file{.backprop} to the
-source file name.
-
-@item forwprop
-@opindex fdump-tree-forwprop
-Dump each function after forward propagating single use variables. The file
-name is made by appending @file{.forwprop} to the source file name.
-
-@item nrv
-@opindex fdump-tree-nrv
-Dump each function after applying the named return value optimization on
-generic trees. The file name is made by appending @file{.nrv} to the source
-file name.
-
-@item vect
-@opindex fdump-tree-vect
-Dump each function after applying vectorization of loops. The file name is
-made by appending @file{.vect} to the source file name.
-
-@item slp
-@opindex fdump-tree-slp
-Dump each function after applying vectorization of basic blocks. The file name
-is made by appending @file{.slp} to the source file name.
-
-@item vrp
-@opindex fdump-tree-vrp
-Dump each function after Value Range Propagation (VRP). The file name
-is made by appending @file{.vrp} to the source file name.
-
-@item oaccdevlow
-@opindex fdump-tree-oaccdevlow
-Dump each function after applying device-specific OpenACC transformations.
-The file name is made by appending @file{.oaccdevlow} to the source file name.
-
-@item all
-@opindex fdump-tree-all
-Enable all the available tree dumps with the flags provided in this option.
-@end table
-
-@item -fopt-info
-@itemx -fopt-info-@var{options}
-@itemx -fopt-info-@var{options}=@var{filename}
-@opindex fopt-info
-Controls optimization dumps from various optimization passes. If the
-@samp{-@var{options}} form is used, @var{options} is a list of
-@samp{-} separated option keywords to select the dump details and
-optimizations.
-
-The @var{options} can be divided into two groups: options describing the
-verbosity of the dump, and options describing which optimizations
-should be included. The options from both the groups can be freely
-mixed as they are non-overlapping. However, in case of any conflicts,
-the later options override the earlier options on the command
-line.
-
-The following options control the dump verbosity:
-
-@table @samp
-@item optimized
-Print information when an optimization is successfully applied. It is
-up to a pass to decide which information is relevant. For example, the
-vectorizer passes print the source location of loops which are
-successfully vectorized.
-@item missed
-Print information about missed optimizations. Individual passes
-control which information to include in the output.
-@item note
-Print verbose information about optimizations, such as certain
-transformations, more detailed messages about decisions etc.
-@item all
-Print detailed optimization information. This includes
-@samp{optimized}, @samp{missed}, and @samp{note}.
-@end table
-
-One or more of the following option keywords can be used to describe a
-group of optimizations:
-
-@table @samp
-@item ipa
-Enable dumps from all interprocedural optimizations.
-@item loop
-Enable dumps from all loop optimizations.
-@item inline
-Enable dumps from all inlining optimizations.
-@item vec
-Enable dumps from all vectorization optimizations.
-@item optall
-Enable dumps from all optimizations. This is a superset of
-the optimization groups listed above.
-@end table
-
-If @var{options} is
-omitted, it defaults to @samp{optimized-optall}, which means to dump all
-info about successful optimizations from all the passes.
-
-If the @var{filename} is provided, then the dumps from all the
-applicable optimizations are concatenated into the @var{filename}.
-Otherwise the dump is output onto @file{stderr}. Though multiple
-@option{-fopt-info} options are accepted, only one of them can include
-a @var{filename}. If other filenames are provided then all but the
-first such option are ignored.
-
-Note that the output @var{filename} is overwritten
-in case of multiple translation units. If a combined output from
-multiple translation units is desired, @file{stderr} should be used
-instead.
-
-In the following example, the optimization info is output to
-@file{stderr}:
-
-@smallexample
-gcc -O3 -fopt-info
-@end smallexample
-
-This example:
-@smallexample
-gcc -O3 -fopt-info-missed=missed.all
-@end smallexample
-
-@noindent
-outputs missed optimization report from all the passes into
-@file{missed.all}, and this one:
-
-@smallexample
-gcc -O2 -ftree-vectorize -fopt-info-vec-missed
-@end smallexample
-
-@noindent
-prints information about missed optimization opportunities from
-vectorization passes on @file{stderr}.
-Note that @option{-fopt-info-vec-missed} is equivalent to
-@option{-fopt-info-missed-vec}.
-
-As another example,
-@smallexample
-gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
-@end smallexample
-
-@noindent
-outputs information about missed optimizations as well as
-optimized locations from all the inlining passes into
-@file{inline.txt}.
-
-Finally, consider:
-
-@smallexample
-gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
-@end smallexample
-
-@noindent
-Here the two output filenames @file{vec.miss} and @file{loop.opt} are
-in conflict since only one output file is allowed. In this case, only
-the first option takes effect and the subsequent options are
-ignored. Thus only @file{vec.miss} is produced which contains
-dumps from the vectorizer about missed opportunities.
-
-@item -frandom-seed=@var{string}
-@opindex frandom-seed
-This option provides a seed that GCC uses in place of
-random numbers in generating certain symbol names
-that have to be different in every compiled file. It is also used to
-place unique stamps in coverage data files and the object files that
-produce them. You can use the @option{-frandom-seed} option to produce
-reproducibly identical object files.
-
-The @var{string} can either be a number (decimal, octal or hex) or an
-arbitrary string (in which case it's converted to a number by
-computing CRC32).
-
-The @var{string} should be different for every file you compile.
-
-@item -fsched-verbose=@var{n}
-@opindex fsched-verbose
-On targets that use instruction scheduling, this option controls the
-amount of debugging output the scheduler prints to the dump files.
-
-For @var{n} greater than zero, @option{-fsched-verbose} outputs the
-same information as @option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2}.
-For @var{n} greater than one, it also output basic block probabilities,
-detailed ready list information and unit/insn info. For @var{n} greater
-than two, it includes RTL at abort point, control-flow and regions info.
-And for @var{n} over four, @option{-fsched-verbose} also includes
-dependence info.
-
-@item -save-temps
-@itemx -save-temps=cwd
-@opindex save-temps
-Store the usual ``temporary'' intermediate files permanently; place them
-in the current directory and name them based on the source file. Thus,
-compiling @file{foo.c} with @option{-c -save-temps} produces files
-@file{foo.i} and @file{foo.s}, as well as @file{foo.o}. This creates a
-preprocessed @file{foo.i} output file even though the compiler now
-normally uses an integrated preprocessor.
-
-When used in combination with the @option{-x} command-line option,
-@option{-save-temps} is sensible enough to avoid over writing an
-input source file with the same extension as an intermediate file.
-The corresponding intermediate file may be obtained by renaming the
-source file before using @option{-save-temps}.
-
-If you invoke GCC in parallel, compiling several different source
-files that share a common base name in different subdirectories or the
-same source file compiled for multiple output destinations, it is
-likely that the different parallel compilers will interfere with each
-other, and overwrite the temporary files. For instance:
-
-@smallexample
-gcc -save-temps -o outdir1/foo.o indir1/foo.c&
-gcc -save-temps -o outdir2/foo.o indir2/foo.c&
-@end smallexample
-
-may result in @file{foo.i} and @file{foo.o} being written to
-simultaneously by both compilers.
-
-@item -save-temps=obj
-@opindex save-temps=obj
-Store the usual ``temporary'' intermediate files permanently. If the
-@option{-o} option is used, the temporary files are based on the
-object file. If the @option{-o} option is not used, the
-@option{-save-temps=obj} switch behaves like @option{-save-temps}.
-
-For example:
-
-@smallexample
-gcc -save-temps=obj -c foo.c
-gcc -save-temps=obj -c bar.c -o dir/xbar.o
-gcc -save-temps=obj foobar.c -o dir2/yfoobar
-@end smallexample
-
-@noindent
-creates @file{foo.i}, @file{foo.s}, @file{dir/xbar.i},
-@file{dir/xbar.s}, @file{dir2/yfoobar.i}, @file{dir2/yfoobar.s}, and
-@file{dir2/yfoobar.o}.
-
-@item -time@r{[}=@var{file}@r{]}
-@opindex time
-Report the CPU time taken by each subprocess in the compilation
-sequence. For C source files, this is the compiler proper and assembler
-(plus the linker if linking is done).
-
-Without the specification of an output file, the output looks like this:
-
-@smallexample
-# cc1 0.12 0.01
-# as 0.00 0.01
-@end smallexample
-
-The first number on each line is the ``user time'', that is time spent
-executing the program itself. The second number is ``system time'',
-time spent executing operating system routines on behalf of the program.
-Both numbers are in seconds.
-
-With the specification of an output file, the output is appended to the
-named file, and it looks like this:
-
-@smallexample
-0.12 0.01 cc1 @var{options}
-0.00 0.01 as @var{options}
-@end smallexample
-
-The ``user time'' and the ``system time'' are moved before the program
-name, and the options passed to the program are displayed, so that one
-can later tell what file was being compiled, and with which options.
-
-@item -fvar-tracking
-@opindex fvar-tracking
-Run variable tracking pass. It computes where variables are stored at each
-position in code. Better debugging information is then generated
-(if the debugging information format supports this information).
-
-It is enabled by default when compiling with optimization (@option{-Os},
-@option{-O}, @option{-O2}, @dots{}), debugging information (@option{-g}) and
-the debug info format supports it.
-
-@item -fvar-tracking-assignments
-@opindex fvar-tracking-assignments
-@opindex fno-var-tracking-assignments
-Annotate assignments to user variables early in the compilation and
-attempt to carry the annotations over throughout the compilation all the
-way to the end, in an attempt to improve debug information while
-optimizing. Use of @option{-gdwarf-4} is recommended along with it.
-
-It can be enabled even if var-tracking is disabled, in which case
-annotations are created and maintained, but discarded at the end.
-By default, this flag is enabled together with @option{-fvar-tracking},
-except when selective scheduling is enabled.
-
-@item -fvar-tracking-assignments-toggle
-@opindex fvar-tracking-assignments-toggle
-@opindex fno-var-tracking-assignments-toggle
-Toggle @option{-fvar-tracking-assignments}, in the same way that
-@option{-gtoggle} toggles @option{-g}.
-
-@item -print-file-name=@var{library}
-@opindex print-file-name
-Print the full absolute name of the library file @var{library} that
-would be used when linking---and don't do anything else. With this
-option, GCC does not compile or link anything; it just prints the
-file name.
-
-@item -print-multi-directory
-@opindex print-multi-directory
-Print the directory name corresponding to the multilib selected by any
-other switches present in the command line. This directory is supposed
-to exist in @env{GCC_EXEC_PREFIX}.
-
-@item -print-multi-lib
-@opindex print-multi-lib
-Print the mapping from multilib directory names to compiler switches
-that enable them. The directory name is separated from the switches by
-@samp{;}, and each switch starts with an @samp{@@} instead of the
-@samp{-}, without spaces between multiple switches. This is supposed to
-ease shell processing.
-
-@item -print-multi-os-directory
-@opindex print-multi-os-directory
-Print the path to OS libraries for the selected
-multilib, relative to some @file{lib} subdirectory. If OS libraries are
-present in the @file{lib} subdirectory and no multilibs are used, this is
-usually just @file{.}, if OS libraries are present in @file{lib@var{suffix}}
-sibling directories this prints e.g.@: @file{../lib64}, @file{../lib} or
-@file{../lib32}, or if OS libraries are present in @file{lib/@var{subdir}}
-subdirectories it prints e.g.@: @file{amd64}, @file{sparcv9} or @file{ev6}.
-
-@item -print-multiarch
-@opindex print-multiarch
-Print the path to OS libraries for the selected multiarch,
-relative to some @file{lib} subdirectory.
-
-@item -print-prog-name=@var{program}
-@opindex print-prog-name
-Like @option{-print-file-name}, but searches for a program such as @command{cpp}.
-
-@item -print-libgcc-file-name
-@opindex print-libgcc-file-name
-Same as @option{-print-file-name=libgcc.a}.
-
-This is useful when you use @option{-nostdlib} or @option{-nodefaultlibs}
-but you do want to link with @file{libgcc.a}. You can do:
-
-@smallexample
-gcc -nostdlib @var{files}@dots{} `gcc -print-libgcc-file-name`
-@end smallexample
-
-@item -print-search-dirs
-@opindex print-search-dirs
-Print the name of the configured installation directory and a list of
-program and library directories @command{gcc} searches---and don't do anything else.
-
-This is useful when @command{gcc} prints the error message
-@samp{installation problem, cannot exec cpp0: No such file or directory}.
-To resolve this you either need to put @file{cpp0} and the other compiler
-components where @command{gcc} expects to find them, or you can set the environment
-variable @env{GCC_EXEC_PREFIX} to the directory where you installed them.
-Don't forget the trailing @samp{/}.
-@xref{Environment Variables}.
-
-@item -print-sysroot
-@opindex print-sysroot
-Print the target sysroot directory that is used during
-compilation. This is the target sysroot specified either at configure
-time or using the @option{--sysroot} option, possibly with an extra
-suffix that depends on compilation options. If no target sysroot is
-specified, the option prints nothing.
-
-@item -print-sysroot-headers-suffix
-@opindex print-sysroot-headers-suffix
-Print the suffix added to the target sysroot when searching for
-headers, or give an error if the compiler is not configured with such
-a suffix---and don't do anything else.
-
-@item -dumpmachine
-@opindex dumpmachine
-Print the compiler's target machine (for example,
-@samp{i686-pc-linux-gnu})---and don't do anything else.
-
-@item -dumpversion
-@opindex dumpversion
-Print the compiler version (for example, @code{3.0})---and don't do
-anything else.
-
-@item -dumpspecs
-@opindex dumpspecs
-Print the compiler's built-in specs---and don't do anything else. (This
-is used when GCC itself is being built.) @xref{Spec Files}.
-
@item -fno-eliminate-unused-debug-types
@opindex feliminate-unused-debug-types
@opindex fno-eliminate-unused-debug-types
@@ -7988,12 +6813,6 @@ Disable sharing of stack slots allocated
pseudo-register that does not get a hard register gets a separate
stack slot, and as a result function stack frames are larger.
-@item -fira-verbose=@var{n}
-@opindex fira-verbose
-Control the verbosity of the dump file for the integrated register allocator.
-The default value is 5. If the value @var{n} is greater or equal to 10,
-the dump output is sent to stderr using the same format as @var{n} minus 10.
-
@item -flra-remat
@opindex flra-remat
Enable CFG-sensitive rematerialization in LRA. Instead of loading
@@ -9227,20 +8046,6 @@ values are 0 (no compression) to 9 (maxi
outside this range are clamped to either 0 or 9. If the option is not
given, a default balanced compression setting is used.
-@item -flto-report
-@opindex flto-report
-Prints a report with internal details on the workings of the link-time
-optimizer. The contents of this report vary from version to version.
-It is meant to be useful to GCC developers when processing object
-files in LTO mode (via @option{-flto}).
-
-Disabled by default.
-
-@item -flto-report-wpa
-@opindex flto-report-wpa
-Like @option{-flto-report}, but only print for the WPA phase of Link
-Time Optimization.
-
@item -fuse-linker-plugin
@opindex fuse-linker-plugin
Enables the use of a linker plugin during link-time optimization. This
@@ -12610,6 +11415,1234 @@ the implementation of the @file{libatomi
@end table
+@node Developer Options
+@section GCC Developer Options
+@cindex developer options
+@cindex debugging GCC
+@cindex debug dump options
+@cindex dump options
+@cindex compilation statistics
+
+This section describes command-line options that are primarily of
+interest to GCC developers, including options to support compiler
+testing and investigation of compiler bugs and compile-time
+performance problems. This includes options that produce debug dumps
+at various points in the compilation; that print statistics such as
+memory use and execution time; and that print information about GCC's
+configuration, such as where it searches for libraries. You should
+rarely need to use any of these options for ordinary compilation and
+linking tasks.
+
+@table @gcctabopt
+
+@item -d@var{letters}
+@itemx -fdump-rtl-@var{pass}
+@itemx -fdump-rtl-@var{pass}=@var{filename}
+@opindex d
+@opindex fdump-rtl-@var{pass}
+Says to make debugging dumps during compilation at times specified by
+@var{letters}. This is used for debugging the RTL-based passes of the
+compiler. The file names for most of the dumps are made by appending
+a pass number and a word to the @var{dumpname}, and the files are
+created in the directory of the output file. In case of
+@option{=@var{filename}} option, the dump is output on the given file
+instead of the pass numbered dump files. Note that the pass number is
+assigned as passes are registered into the pass manager. Most passes
+are registered in the order that they will execute and for these passes
+the number corresponds to the pass execution order. However, passes
+registered by plugins, passes specific to compilation targets, or
+passes that are otherwise registered after all the other passes are
+numbered higher than a pass named "final", even if they are executed
+earlier. @var{dumpname} is generated from the name of the output
+file if explicitly specified and not an executable, otherwise it is
+the basename of the source file. These switches may have different
+effects when @option{-E} is used for preprocessing.
+
+Debug dumps can be enabled with a @option{-fdump-rtl} switch or some
+@option{-d} option @var{letters}. Here are the possible
+letters for use in @var{pass} and @var{letters}, and their meanings:
+
+@table @gcctabopt
+
+@item -fdump-rtl-alignments
+@opindex fdump-rtl-alignments
+Dump after branch alignments have been computed.
+
+@item -fdump-rtl-asmcons
+@opindex fdump-rtl-asmcons
+Dump after fixing rtl statements that have unsatisfied in/out constraints.
+
+@item -fdump-rtl-auto_inc_dec
+@opindex fdump-rtl-auto_inc_dec
+Dump after auto-inc-dec discovery. This pass is only run on
+architectures that have auto inc or auto dec instructions.
+
+@item -fdump-rtl-barriers
+@opindex fdump-rtl-barriers
+Dump after cleaning up the barrier instructions.
+
+@item -fdump-rtl-bbpart
+@opindex fdump-rtl-bbpart
+Dump after partitioning hot and cold basic blocks.
+
+@item -fdump-rtl-bbro
+@opindex fdump-rtl-bbro
+Dump after block reordering.
+
+@item -fdump-rtl-btl1
+@itemx -fdump-rtl-btl2
+@opindex fdump-rtl-btl2
+@opindex fdump-rtl-btl2
+@option{-fdump-rtl-btl1} and @option{-fdump-rtl-btl2} enable dumping
+after the two branch
+target load optimization passes.
+
+@item -fdump-rtl-bypass
+@opindex fdump-rtl-bypass
+Dump after jump bypassing and control flow optimizations.
+
+@item -fdump-rtl-combine
+@opindex fdump-rtl-combine
+Dump after the RTL instruction combination pass.
+
+@item -fdump-rtl-compgotos
+@opindex fdump-rtl-compgotos
+Dump after duplicating the computed gotos.
+
+@item -fdump-rtl-ce1
+@itemx -fdump-rtl-ce2
+@itemx -fdump-rtl-ce3
+@opindex fdump-rtl-ce1
+@opindex fdump-rtl-ce2
+@opindex fdump-rtl-ce3
+@option{-fdump-rtl-ce1}, @option{-fdump-rtl-ce2}, and
+@option{-fdump-rtl-ce3} enable dumping after the three
+if conversion passes.
+
+@item -fdump-rtl-cprop_hardreg
+@opindex fdump-rtl-cprop_hardreg
+Dump after hard register copy propagation.
+
+@item -fdump-rtl-csa
+@opindex fdump-rtl-csa
+Dump after combining stack adjustments.
+
+@item -fdump-rtl-cse1
+@itemx -fdump-rtl-cse2
+@opindex fdump-rtl-cse1
+@opindex fdump-rtl-cse2
+@option{-fdump-rtl-cse1} and @option{-fdump-rtl-cse2} enable dumping after
+the two common subexpression elimination passes.
+
+@item -fdump-rtl-dce
+@opindex fdump-rtl-dce
+Dump after the standalone dead code elimination passes.
+
+@item -fdump-rtl-dbr
+@opindex fdump-rtl-dbr
+Dump after delayed branch scheduling.
+
+@item -fdump-rtl-dce1
+@itemx -fdump-rtl-dce2
+@opindex fdump-rtl-dce1
+@opindex fdump-rtl-dce2
+@option{-fdump-rtl-dce1} and @option{-fdump-rtl-dce2} enable dumping after
+the two dead store elimination passes.
+
+@item -fdump-rtl-eh
+@opindex fdump-rtl-eh
+Dump after finalization of EH handling code.
+
+@item -fdump-rtl-eh_ranges
+@opindex fdump-rtl-eh_ranges
+Dump after conversion of EH handling range regions.
+
+@item -fdump-rtl-expand
+@opindex fdump-rtl-expand
+Dump after RTL generation.
+
+@item -fdump-rtl-fwprop1
+@itemx -fdump-rtl-fwprop2
+@opindex fdump-rtl-fwprop1
+@opindex fdump-rtl-fwprop2
+@option{-fdump-rtl-fwprop1} and @option{-fdump-rtl-fwprop2} enable
+dumping after the two forward propagation passes.
+
+@item -fdump-rtl-gcse1
+@itemx -fdump-rtl-gcse2
+@opindex fdump-rtl-gcse1
+@opindex fdump-rtl-gcse2
+@option{-fdump-rtl-gcse1} and @option{-fdump-rtl-gcse2} enable dumping
+after global common subexpression elimination.
+
+@item -fdump-rtl-init-regs
+@opindex fdump-rtl-init-regs
+Dump after the initialization of the registers.
+
+@item -fdump-rtl-initvals
+@opindex fdump-rtl-initvals
+Dump after the computation of the initial value sets.
+
+@item -fdump-rtl-into_cfglayout
+@opindex fdump-rtl-into_cfglayout
+Dump after converting to cfglayout mode.
+
+@item -fdump-rtl-ira
+@opindex fdump-rtl-ira
+Dump after iterated register allocation.
+
+@item -fdump-rtl-jump
+@opindex fdump-rtl-jump
+Dump after the second jump optimization.
+
+@item -fdump-rtl-loop2
+@opindex fdump-rtl-loop2
+@option{-fdump-rtl-loop2} enables dumping after the rtl
+loop optimization passes.
+
+@item -fdump-rtl-mach
+@opindex fdump-rtl-mach
+Dump after performing the machine dependent reorganization pass, if that
+pass exists.
+
+@item -fdump-rtl-mode_sw
+@opindex fdump-rtl-mode_sw
+Dump after removing redundant mode switches.
+
+@item -fdump-rtl-rnreg
+@opindex fdump-rtl-rnreg
+Dump after register renumbering.
+
+@item -fdump-rtl-outof_cfglayout
+@opindex fdump-rtl-outof_cfglayout
+Dump after converting from cfglayout mode.
+
+@item -fdump-rtl-peephole2
+@opindex fdump-rtl-peephole2
+Dump after the peephole pass.
+
+@item -fdump-rtl-postreload
+@opindex fdump-rtl-postreload
+Dump after post-reload optimizations.
+
+@item -fdump-rtl-pro_and_epilogue
+@opindex fdump-rtl-pro_and_epilogue
+Dump after generating the function prologues and epilogues.
+
+@item -fdump-rtl-sched1
+@itemx -fdump-rtl-sched2
+@opindex fdump-rtl-sched1
+@opindex fdump-rtl-sched2
+@option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2} enable dumping
+after the basic block scheduling passes.
+
+@item -fdump-rtl-ree
+@opindex fdump-rtl-ree
+Dump after sign/zero extension elimination.
+
+@item -fdump-rtl-seqabstr
+@opindex fdump-rtl-seqabstr
+Dump after common sequence discovery.
+
+@item -fdump-rtl-shorten
+@opindex fdump-rtl-shorten
+Dump after shortening branches.
+
+@item -fdump-rtl-sibling
+@opindex fdump-rtl-sibling
+Dump after sibling call optimizations.
+
+@item -fdump-rtl-split1
+@itemx -fdump-rtl-split2
+@itemx -fdump-rtl-split3
+@itemx -fdump-rtl-split4
+@itemx -fdump-rtl-split5
+@opindex fdump-rtl-split1
+@opindex fdump-rtl-split2
+@opindex fdump-rtl-split3
+@opindex fdump-rtl-split4
+@opindex fdump-rtl-split5
+These options enable dumping after five rounds of
+instruction splitting.
+
+@item -fdump-rtl-sms
+@opindex fdump-rtl-sms
+Dump after modulo scheduling. This pass is only run on some
+architectures.
+
+@item -fdump-rtl-stack
+@opindex fdump-rtl-stack
+Dump after conversion from GCC's ``flat register file'' registers to the
+x87's stack-like registers. This pass is only run on x86 variants.
+
+@item -fdump-rtl-subreg1
+@itemx -fdump-rtl-subreg2
+@opindex fdump-rtl-subreg1
+@opindex fdump-rtl-subreg2
+@option{-fdump-rtl-subreg1} and @option{-fdump-rtl-subreg2} enable dumping after
+the two subreg expansion passes.
+
+@item -fdump-rtl-unshare
+@opindex fdump-rtl-unshare
+Dump after all rtl has been unshared.
+
+@item -fdump-rtl-vartrack
+@opindex fdump-rtl-vartrack
+Dump after variable tracking.
+
+@item -fdump-rtl-vregs
+@opindex fdump-rtl-vregs
+Dump after converting virtual registers to hard registers.
+
+@item -fdump-rtl-web
+@opindex fdump-rtl-web
+Dump after live range splitting.
+
+@item -fdump-rtl-regclass
+@itemx -fdump-rtl-subregs_of_mode_init
+@itemx -fdump-rtl-subregs_of_mode_finish
+@itemx -fdump-rtl-dfinit
+@itemx -fdump-rtl-dfinish
+@opindex fdump-rtl-regclass
+@opindex fdump-rtl-subregs_of_mode_init
+@opindex fdump-rtl-subregs_of_mode_finish
+@opindex fdump-rtl-dfinit
+@opindex fdump-rtl-dfinish
+These dumps are defined but always produce empty files.
+
+@item -da
+@itemx -fdump-rtl-all
+@opindex da
+@opindex fdump-rtl-all
+Produce all the dumps listed above.
+
+@item -dA
+@opindex dA
+Annotate the assembler output with miscellaneous debugging information.
+
+@item -dD
+@opindex dD
+Dump all macro definitions, at the end of preprocessing, in addition to
+normal output.
+
+@item -dH
+@opindex dH
+Produce a core dump whenever an error occurs.
+
+@item -dp
+@opindex dp
+Annotate the assembler output with a comment indicating which
+pattern and alternative is used. The length of each instruction is
+also printed.
+
+@item -dP
+@opindex dP
+Dump the RTL in the assembler output as a comment before each instruction.
+Also turns on @option{-dp} annotation.
+
+@item -dx
+@opindex dx
+Just generate RTL for a function instead of compiling it. Usually used
+with @option{-fdump-rtl-expand}.
+@end table
+
+@item -fdump-noaddr
+@opindex fdump-noaddr
+When doing debugging dumps, suppress address output. This makes it more
+feasible to use diff on debugging dumps for compiler invocations with
+different compiler binaries and/or different
+text / bss / data / heap / stack / dso start locations.
+
+@item -freport-bug
+@opindex freport-bug
+Collect and dump debug information into temporary file if ICE in C/C++
+compiler occured.
+
+@item -fdump-unnumbered
+@opindex fdump-unnumbered
+When doing debugging dumps, suppress instruction numbers and address output.
+This makes it more feasible to use diff on debugging dumps for compiler
+invocations with different options, in particular with and without
+@option{-g}.
+
+@item -fdump-unnumbered-links
+@opindex fdump-unnumbered-links
+When doing debugging dumps (see @option{-d} option above), suppress
+instruction numbers for the links to the previous and next instructions
+in a sequence.
+
+@item -fdump-translation-unit @r{(C++ only)}
+@itemx -fdump-translation-unit-@var{options} @r{(C++ only)}
+@opindex fdump-translation-unit
+Dump a representation of the tree structure for the entire translation
+unit to a file. The file name is made by appending @file{.tu} to the
+source file name, and the file is created in the same directory as the
+output file. If the @samp{-@var{options}} form is used, @var{options}
+controls the details of the dump as described for the
+@option{-fdump-tree} options.
+
+@item -fdump-class-hierarchy @r{(C++ only)}
+@itemx -fdump-class-hierarchy-@var{options} @r{(C++ only)}
+@opindex fdump-class-hierarchy
+Dump a representation of each class's hierarchy and virtual function
+table layout to a file. The file name is made by appending
+@file{.class} to the source file name, and the file is created in the
+same directory as the output file. If the @samp{-@var{options}} form
+is used, @var{options} controls the details of the dump as described
+for the @option{-fdump-tree} options.
+
+@item -fdump-ipa-@var{switch}
+@opindex fdump-ipa
+Control the dumping at various stages of inter-procedural analysis
+language tree to a file. The file name is generated by appending a
+switch specific suffix to the source file name, and the file is created
+in the same directory as the output file. The following dumps are
+possible:
+
+@table @samp
+@item all
+Enables all inter-procedural analysis dumps.
+
+@item cgraph
+Dumps information about call-graph optimization, unused function removal,
+and inlining decisions.
+
+@item inline
+Dump after function inlining.
+
+@end table
+
+@item -fdump-passes
+@opindex fdump-passes
+Dump the list of optimization passes that are turned on and off by
+the current command-line options.
+
+@item -fdump-statistics-@var{option}
+@opindex fdump-statistics
+Enable and control dumping of pass statistics in a separate file. The
+file name is generated by appending a suffix ending in
+@samp{.statistics} to the source file name, and the file is created in
+the same directory as the output file. If the @samp{-@var{option}}
+form is used, @samp{-stats} causes counters to be summed over the
+whole compilation unit while @samp{-details} dumps every event as
+the passes generate them. The default with no option is to sum
+counters for each function compiled.
+
+@item -fdump-tree-@var{switch}
+@itemx -fdump-tree-@var{switch}-@var{options}
+@itemx -fdump-tree-@var{switch}-@var{options}=@var{filename}
+@opindex fdump-tree
+Control the dumping at various stages of processing the intermediate
+language tree to a file. The file name is generated by appending a
+switch-specific suffix to the source file name, and the file is
+created in the same directory as the output file. In case of
+@option{=@var{filename}} option, the dump is output on the given file
+instead of the auto named dump files. If the @samp{-@var{options}}
+form is used, @var{options} is a list of @samp{-} separated options
+which control the details of the dump. Not all options are applicable
+to all dumps; those that are not meaningful are ignored. The
+following options are available
+
+@table @samp
+@item address
+Print the address of each node. Usually this is not meaningful as it
+changes according to the environment and source file. Its primary use
+is for tying up a dump file with a debug environment.
+@item asmname
+If @code{DECL_ASSEMBLER_NAME} has been set for a given decl, use that
+in the dump instead of @code{DECL_NAME}. Its primary use is ease of
+use working backward from mangled names in the assembly file.
+@item slim
+When dumping front-end intermediate representations, inhibit dumping
+of members of a scope or body of a function merely because that scope
+has been reached. Only dump such items when they are directly reachable
+by some other path.
+
+When dumping pretty-printed trees, this option inhibits dumping the
+bodies of control structures.
+
+When dumping RTL, print the RTL in slim (condensed) form instead of
+the default LISP-like representation.
+@item raw
+Print a raw representation of the tree. By default, trees are
+pretty-printed into a C-like representation.
+@item details
+Enable more detailed dumps (not honored by every dump option). Also
+include information from the optimization passes.
+@item stats
+Enable dumping various statistics about the pass (not honored by every dump
+option).
+@item blocks
+Enable showing basic block boundaries (disabled in raw dumps).
+@item graph
+For each of the other indicated dump files (@option{-fdump-rtl-@var{pass}}),
+dump a representation of the control flow graph suitable for viewing with
+GraphViz to @file{@var{file}.@var{passid}.@var{pass}.dot}. Each function in
+the file is pretty-printed as a subgraph, so that GraphViz can render them
+all in a single plot.
+
+This option currently only works for RTL dumps, and the RTL is always
+dumped in slim form.
+@item vops
+Enable showing virtual operands for every statement.
+@item lineno
+Enable showing line numbers for statements.
+@item uid
+Enable showing the unique ID (@code{DECL_UID}) for each variable.
+@item verbose
+Enable showing the tree dump for each statement.
+@item eh
+Enable showing the EH region number holding each statement.
+@item scev
+Enable showing scalar evolution analysis details.
+@item optimized
+Enable showing optimization information (only available in certain
+passes).
+@item missed
+Enable showing missed optimization information (only available in certain
+passes).
+@item note
+Enable other detailed optimization information (only available in
+certain passes).
+@item =@var{filename}
+Instead of an auto named dump file, output into the given file
+name. The file names @file{stdout} and @file{stderr} are treated
+specially and are considered already open standard streams. For
+example,
+
+@smallexample
+gcc -O2 -ftree-vectorize -fdump-tree-vect-blocks=foo.dump
+ -fdump-tree-pre=stderr file.c
+@end smallexample
+
+outputs vectorizer dump into @file{foo.dump}, while the PRE dump is
+output on to @file{stderr}. If two conflicting dump filenames are
+given for the same pass, then the latter option overrides the earlier
+one.
+
+@item split-paths
+@opindex fdump-tree-split-paths
+Dump each function after splitting paths to loop backedges. The file
+name is made by appending @file{.split-paths} to the source file name.
+
+@item all
+Turn on all options, except @option{raw}, @option{slim}, @option{verbose}
+and @option{lineno}.
+
+@item optall
+Turn on all optimization options, i.e., @option{optimized},
+@option{missed}, and @option{note}.
+@end table
+
+The following tree dumps are possible:
+@table @samp
+
+@item original
+@opindex fdump-tree-original
+Dump before any tree based optimization, to @file{@var{file}.original}.
+
+@item optimized
+@opindex fdump-tree-optimized
+Dump after all tree based optimization, to @file{@var{file}.optimized}.
+
+@item gimple
+@opindex fdump-tree-gimple
+Dump each function before and after the gimplification pass to a file. The
+file name is made by appending @file{.gimple} to the source file name.
+
+@item cfg
+@opindex fdump-tree-cfg
+Dump the control flow graph of each function to a file. The file name is
+made by appending @file{.cfg} to the source file name.
+
+@item ch
+@opindex fdump-tree-ch
+Dump each function after copying loop headers. The file name is made by
+appending @file{.ch} to the source file name.
+
+@item ssa
+@opindex fdump-tree-ssa
+Dump SSA related information to a file. The file name is made by appending
+@file{.ssa} to the source file name.
+
+@item alias
+@opindex fdump-tree-alias
+Dump aliasing information for each function. The file name is made by
+appending @file{.alias} to the source file name.
+
+@item ccp
+@opindex fdump-tree-ccp
+Dump each function after CCP@. The file name is made by appending
+@file{.ccp} to the source file name.
+
+@item storeccp
+@opindex fdump-tree-storeccp
+Dump each function after STORE-CCP@. The file name is made by appending
+@file{.storeccp} to the source file name.
+
+@item pre
+@opindex fdump-tree-pre
+Dump trees after partial redundancy elimination. The file name is made
+by appending @file{.pre} to the source file name.
+
+@item fre
+@opindex fdump-tree-fre
+Dump trees after full redundancy elimination. The file name is made
+by appending @file{.fre} to the source file name.
+
+@item copyprop
+@opindex fdump-tree-copyprop
+Dump trees after copy propagation. The file name is made
+by appending @file{.copyprop} to the source file name.
+
+@item store_copyprop
+@opindex fdump-tree-store_copyprop
+Dump trees after store copy-propagation. The file name is made
+by appending @file{.store_copyprop} to the source file name.
+
+@item dce
+@opindex fdump-tree-dce
+Dump each function after dead code elimination. The file name is made by
+appending @file{.dce} to the source file name.
+
+@item sra
+@opindex fdump-tree-sra
+Dump each function after performing scalar replacement of aggregates. The
+file name is made by appending @file{.sra} to the source file name.
+
+@item sink
+@opindex fdump-tree-sink
+Dump each function after performing code sinking. The file name is made
+by appending @file{.sink} to the source file name.
+
+@item dom
+@opindex fdump-tree-dom
+Dump each function after applying dominator tree optimizations. The file
+name is made by appending @file{.dom} to the source file name.
+
+@item dse
+@opindex fdump-tree-dse
+Dump each function after applying dead store elimination. The file
+name is made by appending @file{.dse} to the source file name.
+
+@item phiopt
+@opindex fdump-tree-phiopt
+Dump each function after optimizing PHI nodes into straightline code. The file
+name is made by appending @file{.phiopt} to the source file name.
+
+@item backprop
+@opindex fdump-tree-backprop
+Dump each function after back-propagating use information up the definition
+chain. The file name is made by appending @file{.backprop} to the
+source file name.
+
+@item forwprop
+@opindex fdump-tree-forwprop
+Dump each function after forward propagating single use variables. The file
+name is made by appending @file{.forwprop} to the source file name.
+
+@item nrv
+@opindex fdump-tree-nrv
+Dump each function after applying the named return value optimization on
+generic trees. The file name is made by appending @file{.nrv} to the source
+file name.
+
+@item vect
+@opindex fdump-tree-vect
+Dump each function after applying vectorization of loops. The file name is
+made by appending @file{.vect} to the source file name.
+
+@item slp
+@opindex fdump-tree-slp
+Dump each function after applying vectorization of basic blocks. The file name
+is made by appending @file{.slp} to the source file name.
+
+@item vrp
+@opindex fdump-tree-vrp
+Dump each function after Value Range Propagation (VRP). The file name
+is made by appending @file{.vrp} to the source file name.
+
+@item oaccdevlow
+@opindex fdump-tree-oaccdevlow
+Dump each function after applying device-specific OpenACC transformations.
+The file name is made by appending @file{.oaccdevlow} to the source file name.
+
+@item all
+@opindex fdump-tree-all
+Enable all the available tree dumps with the flags provided in this option.
+@end table
+
+@item -fopt-info
+@itemx -fopt-info-@var{options}
+@itemx -fopt-info-@var{options}=@var{filename}
+@opindex fopt-info
+Controls optimization dumps from various optimization passes. If the
+@samp{-@var{options}} form is used, @var{options} is a list of
+@samp{-} separated option keywords to select the dump details and
+optimizations.
+
+The @var{options} can be divided into two groups: options describing the
+verbosity of the dump, and options describing which optimizations
+should be included. The options from both the groups can be freely
+mixed as they are non-overlapping. However, in case of any conflicts,
+the later options override the earlier options on the command
+line.
+
+The following options control the dump verbosity:
+
+@table @samp
+@item optimized
+Print information when an optimization is successfully applied. It is
+up to a pass to decide which information is relevant. For example, the
+vectorizer passes print the source location of loops which are
+successfully vectorized.
+@item missed
+Print information about missed optimizations. Individual passes
+control which information to include in the output.
+@item note
+Print verbose information about optimizations, such as certain
+transformations, more detailed messages about decisions etc.
+@item all
+Print detailed optimization information. This includes
+@samp{optimized}, @samp{missed}, and @samp{note}.
+@end table
+
+One or more of the following option keywords can be used to describe a
+group of optimizations:
+
+@table @samp
+@item ipa
+Enable dumps from all interprocedural optimizations.
+@item loop
+Enable dumps from all loop optimizations.
+@item inline
+Enable dumps from all inlining optimizations.
+@item vec
+Enable dumps from all vectorization optimizations.
+@item optall
+Enable dumps from all optimizations. This is a superset of
+the optimization groups listed above.
+@end table
+
+If @var{options} is
+omitted, it defaults to @samp{optimized-optall}, which means to dump all
+info about successful optimizations from all the passes.
+
+If the @var{filename} is provided, then the dumps from all the
+applicable optimizations are concatenated into the @var{filename}.
+Otherwise the dump is output onto @file{stderr}. Though multiple
+@option{-fopt-info} options are accepted, only one of them can include
+a @var{filename}. If other filenames are provided then all but the
+first such option are ignored.
+
+Note that the output @var{filename} is overwritten
+in case of multiple translation units. If a combined output from
+multiple translation units is desired, @file{stderr} should be used
+instead.
+
+In the following example, the optimization info is output to
+@file{stderr}:
+
+@smallexample
+gcc -O3 -fopt-info
+@end smallexample
+
+This example:
+@smallexample
+gcc -O3 -fopt-info-missed=missed.all
+@end smallexample
+
+@noindent
+outputs missed optimization report from all the passes into
+@file{missed.all}, and this one:
+
+@smallexample
+gcc -O2 -ftree-vectorize -fopt-info-vec-missed
+@end smallexample
+
+@noindent
+prints information about missed optimization opportunities from
+vectorization passes on @file{stderr}.
+Note that @option{-fopt-info-vec-missed} is equivalent to
+@option{-fopt-info-missed-vec}.
+
+As another example,
+@smallexample
+gcc -O3 -fopt-info-inline-optimized-missed=inline.txt
+@end smallexample
+
+@noindent
+outputs information about missed optimizations as well as
+optimized locations from all the inlining passes into
+@file{inline.txt}.
+
+Finally, consider:
+
+@smallexample
+gcc -fopt-info-vec-missed=vec.miss -fopt-info-loop-optimized=loop.opt
+@end smallexample
+
+@noindent
+Here the two output filenames @file{vec.miss} and @file{loop.opt} are
+in conflict since only one output file is allowed. In this case, only
+the first option takes effect and the subsequent options are
+ignored. Thus only @file{vec.miss} is produced which contains
+dumps from the vectorizer about missed opportunities.
+
+@item -fsched-verbose=@var{n}
+@opindex fsched-verbose
+On targets that use instruction scheduling, this option controls the
+amount of debugging output the scheduler prints to the dump files.
+
+For @var{n} greater than zero, @option{-fsched-verbose} outputs the
+same information as @option{-fdump-rtl-sched1} and @option{-fdump-rtl-sched2}.
+For @var{n} greater than one, it also output basic block probabilities,
+detailed ready list information and unit/insn info. For @var{n} greater
+than two, it includes RTL at abort point, control-flow and regions info.
+And for @var{n} over four, @option{-fsched-verbose} also includes
+dependence info.
+
+
+
+@item -fenable-@var{kind}-@var{pass}
+@itemx -fdisable-@var{kind}-@var{pass}=@var{range-list}
+@opindex fdisable-
+@opindex fenable-
+
+This is a set of options that are used to explicitly disable/enable
+optimization passes. These options are intended for use for debugging GCC.
+Compiler users should use regular options for enabling/disabling
+passes instead.
+
+@table @gcctabopt
+
+@item -fdisable-ipa-@var{pass}
+Disable IPA pass @var{pass}. @var{pass} is the pass name. If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1.
+
+@item -fdisable-rtl-@var{pass}
+@itemx -fdisable-rtl-@var{pass}=@var{range-list}
+Disable RTL pass @var{pass}. @var{pass} is the pass name. If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1. @var{range-list} is a
+comma-separated list of function ranges or assembler names. Each range is a number
+pair separated by a colon. The range is inclusive in both ends. If the range
+is trivial, the number pair can be simplified as a single number. If the
+function's call graph node's @var{uid} falls within one of the specified ranges,
+the @var{pass} is disabled for that function. The @var{uid} is shown in the
+function header of a dump file, and the pass names can be dumped by using
+option @option{-fdump-passes}.
+
+@item -fdisable-tree-@var{pass}
+@itemx -fdisable-tree-@var{pass}=@var{range-list}
+Disable tree pass @var{pass}. See @option{-fdisable-rtl} for the description of
+option arguments.
+
+@item -fenable-ipa-@var{pass}
+Enable IPA pass @var{pass}. @var{pass} is the pass name. If the same pass is
+statically invoked in the compiler multiple times, the pass name should be
+appended with a sequential number starting from 1.
+
+@item -fenable-rtl-@var{pass}
+@itemx -fenable-rtl-@var{pass}=@var{range-list}
+Enable RTL pass @var{pass}. See @option{-fdisable-rtl} for option argument
+description and examples.
+
+@item -fenable-tree-@var{pass}
+@itemx -fenable-tree-@var{pass}=@var{range-list}
+Enable tree pass @var{pass}. See @option{-fdisable-rtl} for the description
+of option arguments.
+
+@end table
+
+Here are some examples showing uses of these options.
+
+@smallexample
+
+# disable ccp1 for all functions
+ -fdisable-tree-ccp1
+# disable complete unroll for function whose cgraph node uid is 1
+ -fenable-tree-cunroll=1
+# disable gcse2 for functions at the following ranges [1,1],
+# [300,400], and [400,1000]
+# disable gcse2 for functions foo and foo2
+ -fdisable-rtl-gcse2=foo,foo2
+# disable early inlining
+ -fdisable-tree-einline
+# disable ipa inlining
+ -fdisable-ipa-inline
+# enable tree full unroll
+ -fenable-tree-unroll
+
+@end smallexample
+
+@item -fchecking
+@opindex fchecking
+@opindex fno-checking
+Enable internal consistency checking. The default depends on
+the compiler configuration.
+
+@item -frandom-seed=@var{string}
+@opindex frandom-seed
+This option provides a seed that GCC uses in place of
+random numbers in generating certain symbol names
+that have to be different in every compiled file. It is also used to
+place unique stamps in coverage data files and the object files that
+produce them. You can use the @option{-frandom-seed} option to produce
+reproducibly identical object files.
+
+The @var{string} can either be a number (decimal, octal or hex) or an
+arbitrary string (in which case it's converted to a number by
+computing CRC32).
+
+The @var{string} should be different for every file you compile.
+
+@item -save-temps
+@itemx -save-temps=cwd
+@opindex save-temps
+Store the usual ``temporary'' intermediate files permanently; place them
+in the current directory and name them based on the source file. Thus,
+compiling @file{foo.c} with @option{-c -save-temps} produces files
+@file{foo.i} and @file{foo.s}, as well as @file{foo.o}. This creates a
+preprocessed @file{foo.i} output file even though the compiler now
+normally uses an integrated preprocessor.
+
+When used in combination with the @option{-x} command-line option,
+@option{-save-temps} is sensible enough to avoid over writing an
+input source file with the same extension as an intermediate file.
+The corresponding intermediate file may be obtained by renaming the
+source file before using @option{-save-temps}.
+
+If you invoke GCC in parallel, compiling several different source
+files that share a common base name in different subdirectories or the
+same source file compiled for multiple output destinations, it is
+likely that the different parallel compilers will interfere with each
+other, and overwrite the temporary files. For instance:
+
+@smallexample
+gcc -save-temps -o outdir1/foo.o indir1/foo.c&
+gcc -save-temps -o outdir2/foo.o indir2/foo.c&
+@end smallexample
+
+may result in @file{foo.i} and @file{foo.o} being written to
+simultaneously by both compilers.
+
+@item -save-temps=obj
+@opindex save-temps=obj
+Store the usual ``temporary'' intermediate files permanently. If the
+@option{-o} option is used, the temporary files are based on the
+object file. If the @option{-o} option is not used, the
+@option{-save-temps=obj} switch behaves like @option{-save-temps}.
+
+For example:
+
+@smallexample
+gcc -save-temps=obj -c foo.c
+gcc -save-temps=obj -c bar.c -o dir/xbar.o
+gcc -save-temps=obj foobar.c -o dir2/yfoobar
+@end smallexample
+
+@noindent
+creates @file{foo.i}, @file{foo.s}, @file{dir/xbar.i},
+@file{dir/xbar.s}, @file{dir2/yfoobar.i}, @file{dir2/yfoobar.s}, and
+@file{dir2/yfoobar.o}.
+
+@item -time@r{[}=@var{file}@r{]}
+@opindex time
+Report the CPU time taken by each subprocess in the compilation
+sequence. For C source files, this is the compiler proper and assembler
+(plus the linker if linking is done).
+
+Without the specification of an output file, the output looks like this:
+
+@smallexample
+# cc1 0.12 0.01
+# as 0.00 0.01
+@end smallexample
+
+The first number on each line is the ``user time'', that is time spent
+executing the program itself. The second number is ``system time'',
+time spent executing operating system routines on behalf of the program.
+Both numbers are in seconds.
+
+With the specification of an output file, the output is appended to the
+named file, and it looks like this:
+
+@smallexample
+0.12 0.01 cc1 @var{options}
+0.00 0.01 as @var{options}
+@end smallexample
+
+The ``user time'' and the ``system time'' are moved before the program
+name, and the options passed to the program are displayed, so that one
+can later tell what file was being compiled, and with which options.
+
+@item -fdump-final-insns@r{[}=@var{file}@r{]}
+@opindex fdump-final-insns
+Dump the final internal representation (RTL) to @var{file}. If the
+optional argument is omitted (or if @var{file} is @code{.}), the name
+of the dump file is determined by appending @code{.gkd} to the
+compilation output file name.
+
+@item -fcompare-debug@r{[}=@var{opts}@r{]}
+@opindex fcompare-debug
+@opindex fno-compare-debug
+If no error occurs during compilation, run the compiler a second time,
+adding @var{opts} and @option{-fcompare-debug-second} to the arguments
+passed to the second compilation. Dump the final internal
+representation in both compilations, and print an error if they differ.
+
+If the equal sign is omitted, the default @option{-gtoggle} is used.
+
+The environment variable @env{GCC_COMPARE_DEBUG}, if defined, non-empty
+and nonzero, implicitly enables @option{-fcompare-debug}. If
+@env{GCC_COMPARE_DEBUG} is defined to a string starting with a dash,
+then it is used for @var{opts}, otherwise the default @option{-gtoggle}
+is used.
+
+@option{-fcompare-debug=}, with the equal sign but without @var{opts},
+is equivalent to @option{-fno-compare-debug}, which disables the dumping
+of the final representation and the second compilation, preventing even
+@env{GCC_COMPARE_DEBUG} from taking effect.
+
+To verify full coverage during @option{-fcompare-debug} testing, set
+@env{GCC_COMPARE_DEBUG} to say @option{-fcompare-debug-not-overridden},
+which GCC rejects as an invalid option in any actual compilation
+(rather than preprocessing, assembly or linking). To get just a
+warning, setting @env{GCC_COMPARE_DEBUG} to @samp{-w%n-fcompare-debug
+not overridden} will do.
+
+@item -fcompare-debug-second
+@opindex fcompare-debug-second
+This option is implicitly passed to the compiler for the second
+compilation requested by @option{-fcompare-debug}, along with options to
+silence warnings, and omitting other options that would cause
+side-effect compiler outputs to files or to the standard output. Dump
+files and preserved temporary files are renamed so as to contain the
+@code{.gk} additional extension during the second compilation, to avoid
+overwriting those generated by the first.
+
+When this option is passed to the compiler driver, it causes the
+@emph{first} compilation to be skipped, which makes it useful for little
+other than debugging the compiler proper.
+
+@item -gtoggle
+@opindex gtoggle
+Turn off generation of debug info, if leaving out this option
+generates it, or turn it on at level 2 otherwise. The position of this
+argument in the command line does not matter; it takes effect after all
+other options are processed, and it does so only once, no matter how
+many times it is given. This is mainly intended to be used with
+@option{-fcompare-debug}.
+
+@item -fvar-tracking-assignments-toggle
+@opindex fvar-tracking-assignments-toggle
+@opindex fno-var-tracking-assignments-toggle
+Toggle @option{-fvar-tracking-assignments}, in the same way that
+@option{-gtoggle} toggles @option{-g}.
+
+@item -Q
+@opindex Q
+Makes the compiler print out each function name as it is compiled, and
+print some statistics about each pass when it finishes.
+
+@item -ftime-report
+@opindex ftime-report
+Makes the compiler print some statistics about the time consumed by each
+pass when it finishes.
+
+@item -fira-verbose=@var{n}
+@opindex fira-verbose
+Control the verbosity of the dump file for the integrated register allocator.
+The default value is 5. If the value @var{n} is greater or equal to 10,
+the dump output is sent to stderr using the same format as @var{n} minus 10.
+
+@item -flto-report
+@opindex flto-report
+Prints a report with internal details on the workings of the link-time
+optimizer. The contents of this report vary from version to version.
+It is meant to be useful to GCC developers when processing object
+files in LTO mode (via @option{-flto}).
+
+Disabled by default.
+
+@item -flto-report-wpa
+@opindex flto-report-wpa
+Like @option{-flto-report}, but only print for the WPA phase of Link
+Time Optimization.
+
+@item -fmem-report
+@opindex fmem-report
+Makes the compiler print some statistics about permanent memory
+allocation when it finishes.
+
+@item -fmem-report-wpa
+@opindex fmem-report-wpa
+Makes the compiler print some statistics about permanent memory
+allocation for the WPA phase only.
+
+@item -fpre-ipa-mem-report
+@opindex fpre-ipa-mem-report
+@item -fpost-ipa-mem-report
+@opindex fpost-ipa-mem-report
+Makes the compiler print some statistics about permanent memory
+allocation before or after interprocedural optimization.
+
+@item -fprofile-report
+@opindex fprofile-report
+Makes the compiler print some statistics about consistency of the
+(estimated) profile and effect of individual passes.
+
+@item -fstack-usage
+@opindex fstack-usage
+Makes the compiler output stack usage information for the program, on a
+per-function basis. The filename for the dump is made by appending
+@file{.su} to the @var{auxname}. @var{auxname} is generated from the name of
+the output file, if explicitly specified and it is not an executable,
+otherwise it is the basename of the source file. An entry is made up
+of three fields:
+
+@itemize
+@item
+The name of the function.
+@item
+A number of bytes.
+@item
+One or more qualifiers: @code{static}, @code{dynamic}, @code{bounded}.
+@end itemize
+
+The qualifier @code{static} means that the function manipulates the stack
+statically: a fixed number of bytes are allocated for the frame on function
+entry and released on function exit; no stack adjustments are otherwise made
+in the function. The second field is this fixed number of bytes.
+
+The qualifier @code{dynamic} means that the function manipulates the stack
+dynamically: in addition to the static allocation described above, stack
+adjustments are made in the body of the function, for example to push/pop
+arguments around function calls. If the qualifier @code{bounded} is also
+present, the amount of these adjustments is bounded at compile time and
+the second field is an upper bound of the total amount of stack used by
+the function. If it is not present, the amount of these adjustments is
+not bounded at compile time and the second field only represents the
+bounded part.
+
+@item -fstats
+@opindex fstats
+Emit statistics about front-end processing at the end of the compilation.
+This option is supported only by the C++ front end, and
+the information is generally only useful to the G++ development team.
+
+@item -fdbg-cnt-list
+@opindex fdbg-cnt-list
+Print the name and the counter upper bound for all debug counters.
+
+
+@item -fdbg-cnt=@var{counter-value-list}
+@opindex fdbg-cnt
+Set the internal debug counter upper bound. @var{counter-value-list}
+is a comma-separated list of @var{name}:@var{value} pairs
+which sets the upper bound of each debug counter @var{name} to @var{value}.
+All debug counters have the initial upper bound of @code{UINT_MAX};
+thus @code{dbg_cnt} returns true always unless the upper bound
+is set by this option.
+For example, with @option{-fdbg-cnt=dce:10,tail_call:0},
+@code{dbg_cnt(dce)} returns true only for first 10 invocations.
+
+@item -print-file-name=@var{library}
+@opindex print-file-name
+Print the full absolute name of the library file @var{library} that
+would be used when linking---and don't do anything else. With this
+option, GCC does not compile or link anything; it just prints the
+file name.
+
+@item -print-multi-directory
+@opindex print-multi-directory
+Print the directory name corresponding to the multilib selected by any
+other switches present in the command line. This directory is supposed
+to exist in @env{GCC_EXEC_PREFIX}.
+
+@item -print-multi-lib
+@opindex print-multi-lib
+Print the mapping from multilib directory names to compiler switches
+that enable them. The directory name is separated from the switches by
+@samp{;}, and each switch starts with an @samp{@@} instead of the
+@samp{-}, without spaces between multiple switches. This is supposed to
+ease shell processing.
+
+@item -print-multi-os-directory
+@opindex print-multi-os-directory
+Print the path to OS libraries for the selected
+multilib, relative to some @file{lib} subdirectory. If OS libraries are
+present in the @file{lib} subdirectory and no multilibs are used, this is
+usually just @file{.}, if OS libraries are present in @file{lib@var{suffix}}
+sibling directories this prints e.g.@: @file{../lib64}, @file{../lib} or
+@file{../lib32}, or if OS libraries are present in @file{lib/@var{subdir}}
+subdirectories it prints e.g.@: @file{amd64}, @file{sparcv9} or @file{ev6}.
+
+@item -print-multiarch
+@opindex print-multiarch
+Print the path to OS libraries for the selected multiarch,
+relative to some @file{lib} subdirectory.
+
+@item -print-prog-name=@var{program}
+@opindex print-prog-name
+Like @option{-print-file-name}, but searches for a program such as @command{cpp}.
+
+@item -print-libgcc-file-name
+@opindex print-libgcc-file-name
+Same as @option{-print-file-name=libgcc.a}.
+
+This is useful when you use @option{-nostdlib} or @option{-nodefaultlibs}
+but you do want to link with @file{libgcc.a}. You can do:
+
+@smallexample
+gcc -nostdlib @var{files}@dots{} `gcc -print-libgcc-file-name`
+@end smallexample
+
+@item -print-search-dirs
+@opindex print-search-dirs
+Print the name of the configured installation directory and a list of
+program and library directories @command{gcc} searches---and don't do anything else.
+
+This is useful when @command{gcc} prints the error message
+@samp{installation problem, cannot exec cpp0: No such file or directory}.
+To resolve this you either need to put @file{cpp0} and the other compiler
+components where @command{gcc} expects to find them, or you can set the environment
+variable @env{GCC_EXEC_PREFIX} to the directory where you installed them.
+Don't forget the trailing @samp{/}.
+@xref{Environment Variables}.
+
+@item -print-sysroot
+@opindex print-sysroot
+Print the target sysroot directory that is used during
+compilation. This is the target sysroot specified either at configure
+time or using the @option{--sysroot} option, possibly with an extra
+suffix that depends on compilation options. If no target sysroot is
+specified, the option prints nothing.
+
+@item -print-sysroot-headers-suffix
+@opindex print-sysroot-headers-suffix
+Print the suffix added to the target sysroot when searching for
+headers, or give an error if the compiler is not configured with such
+a suffix---and don't do anything else.
+
+@item -dumpmachine
+@opindex dumpmachine
+Print the compiler's target machine (for example,
+@samp{i686-pc-linux-gnu})---and don't do anything else.
+
+@item -dumpversion
+@opindex dumpversion
+Print the compiler version (for example, @code{3.0})---and don't do
+anything else.
+
+@item -dumpspecs
+@opindex dumpspecs
+Print the compiler's built-in specs---and don't do anything else. (This
+is used when GCC itself is being built.) @xref{Spec Files}.
+@end table
+
@node Submodel Options
@section Machine-Dependent Options
@cindex submodel options
Index: gcc/doc/cppopts.texi
===================================================================
--- gcc/doc/cppopts.texi (revision 232474)
+++ gcc/doc/cppopts.texi (working copy)
@@ -710,7 +710,7 @@ will show all the predefined macros.
If you use @option{-dM} without the @option{-E} option, @option{-dM} is
interpreted as a synonym for @option{-fdump-rtl-mach}.
-@xref{Debugging Options, , ,gcc}.
+@xref{Developer Options, , ,gcc}.
@item D
@opindex dD