This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[PATCH] Disable PCH for -g other than dwarf[234] (PR pch/54117, take 2)
On Thu, Feb 14, 2013 at 05:48:57AM -0700, Jeff Law wrote:
> I think two tests should be sufficient. First, compile a simple
> program with -g and verify it generates dwarf2 debug records.
> Second verify that there aren't any -g<foo> options, unless <foo> is
> dwarf2.
>
> I'm actually on PTO today/tomorrow, so I won't be able to look
> further at this until Monday.
>
> If someone wants to run with it, my recommendation would be Steven's
> warning patch, moved to the location Jakub suggests so that users
> know stabs+PCH is going away plus a hack to the testsuite suite
> similar to what I outlined above plus something to either suppress
> creation of the pch or suppress reading the PCH in the presence of
> non-dwarf debug output.
Here is what seems to work for me.
Tested with
make check -j4 -k RUNTESTFLAGS='--target_board=unix\{-m32,-m32/-gstabs,-m64,-m64/-gstabs\} pch.exp'
on x86_64-linux, both with gcc just with this patch and also
this patch + changed PREFERRED_DEBUGGING_TYPE to DBX_DEBUG.
No FAILs at all, tests that wouldn't work because either -gstabs is forced
in the flags from target board or tests that would be compiled with -g
when stabs is the default are UNSUPPORTED.
2013-02-15 Jakub Jelinek <jakub@redhat.com>
Steven Bosscher <steven@gcc.gnu.org>
PR pch/54117
* c-opts.c (c_common_post_options): If debug info is enabled
and non-dwarf*, refuse to load PCH files and when writing PCH
file warn.
* lib/dg-pch.exp (pch-init, pch-finish,
check_effective_target_pch_supported_debug): New procs.
(dg-flags-pch): If $pch_unsupported, make tests UNSUPPORTED.
Likewise if $pch_unsupported_debug and $flags include -g.
Skip FAILs about missing *.gch file if $pch_unsupported_debug
and dg-require-effective-target pch_unsupported_debug.
* g++.dg/pch/pch.exp: Call pch-init and pch-finish.
* objc.dg/pch/pch.exp: Likewise.
* gcc.dg/pch/pch.exp: Likewise.
* gcc.dg/pch/valid-1.c: Add dg-require-effective-target
pch_unsupported_debug.
* gcc.dg/pch/valid-1.hs: Likewise.
* gcc.dg/pch/valid-1b.c: Likewise.
* gcc.dg/pch/valid-1b.hs: Likewise.
--- gcc/c-family/c-opts.c.jj 2013-02-14 14:45:01.000000000 +0100
+++ gcc/c-family/c-opts.c 2013-02-15 12:44:48.936535118 +0100
@@ -945,6 +945,16 @@ c_common_post_options (const char **pfil
because the default address space slot then can't be used
for the output PCH file. */
if (pch_file)
+ {
+ c_common_no_more_pch ();
+ /* Only -g0 and -gdwarf* are supported with PCH, for other
+ debug formats we warn here and refuse to load any PCH files. */
+ if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
+ warning (OPT_Wdeprecated,
+ "the \"%s\" debug format cannot be used with "
+ "pre-compiled headers", debug_type_names[write_symbols]);
+ }
+ else if (write_symbols != NO_DEBUG && write_symbols != DWARF2_DEBUG)
c_common_no_more_pch ();
/* Yuk. WTF is this? I do know ObjC relies on it somewhere. */
--- gcc/testsuite/lib/dg-pch.exp.jj 2013-01-11 09:02:39.000000000 +0100
+++ gcc/testsuite/lib/dg-pch.exp 2013-02-15 15:45:53.747855529 +0100
@@ -16,8 +16,49 @@
load_lib copy-file.exp
+proc pch-init { args } {
+ global pch_unsupported_debug pch_unsupported
+
+ if [info exists pch_unsupported_debug] {
+ error "pch-init: pch_unsupported_debug is not empty as expected"
+ }
+ if [info exists pch_unsupported] {
+ error "pch-init: pch_unsupported is not empty as expected"
+ }
+
+ set result [check_compile pchtest object "int i;" "-g -x c-header"]
+ set pch_unsupported_debug \
+ [regexp "debug format cannot be used with pre-compiled headers" \
+ [lindex $result 0]]
+
+ set pch_unsupported 0
+ if { $pch_unsupported_debug } {
+ verbose -log "pch is unsupported with the debug info format"
+
+ set result [check_compile pchtest object "int i;" "-x c-header"]
+ set pch_unsupported \
+ [regexp "debug format cannot be used with pre-compiled headers" \
+ [lindex $result 0]]
+ }
+}
+
+proc pch-finish { args } {
+ global pch_unsupported_debug pch_unsupported
+ unset pch_unsupported_debug
+ unset pch_unsupported
+}
+
+proc check_effective_target_pch_supported_debug { } {
+ global pch_unsupported_debug
+ if { $pch_unsupported_debug } {
+ return 0
+ }
+ return 1
+}
+
proc dg-flags-pch { subdir test otherflags options suffix } {
global runtests dg-do-what-default
+ global pch_unsupported_debug pch_unsupported
# If we're only testing specific files and this isn't one of them, skip it.
if ![runtest_file_p $runtests $test] {
@@ -35,6 +76,13 @@ proc dg-flags-pch { subdir test otherfla
foreach flags $options {
verbose "Testing $nshort, $otherflags $flags" 1
+ if { $pch_unsupported != 0 \
+ || ( $pch_unsupported_debug != 0 && [regexp " -g" " $flags"] ) } {
+ verbose -log "$nshort unsupported because debug format conflicts with PCH"
+ unsupported "$nshort $flags"
+ continue
+ }
+
# For the header files, the default is to precompile.
set dg-do-what-default precompile
catch { file_on_host delete "$bname$suffix" }
@@ -78,7 +126,8 @@ proc dg-flags-pch { subdir test otherfla
fail "$nshort $flags assembly comparison"
}
}
- } else {
+ } elseif { $pch_unsupported_debug == 0 \
+ || [llength [grep $test "{\[ \t\]\+dg-require-effective-target\[ \t\]\+pch_supported_debug\[ \t\]\+.*\[ \t\]\+}"]] > 0 } {
verbose -log "pch file '$bname$suffix.gch' missing"
fail "$nshort $flags"
if { !$have_errs } {
--- gcc/testsuite/g++.dg/pch/pch.exp.jj 2013-01-11 09:02:44.000000000 +0100
+++ gcc/testsuite/g++.dg/pch/pch.exp 2013-02-15 14:53:03.517106464 +0100
@@ -23,6 +23,7 @@ load_lib dg-pch.exp
# Initialize `dg'.
dg-init
+pch-init
set old_dg_do_what_default "${dg-do-what-default}"
@@ -36,4 +37,5 @@ foreach test [lsort [glob -nocomplain $s
set dg-do-what-default "$old_dg_do_what_default"
# All done.
+pch-finish
dg-finish
--- gcc/testsuite/objc.dg/pch/pch.exp.jj 2013-01-11 09:02:44.000000000 +0100
+++ gcc/testsuite/objc.dg/pch/pch.exp 2013-02-15 14:53:30.063951051 +0100
@@ -24,8 +24,8 @@ load_lib torture-options.exp
# Initialize `dg'.
dg-init
-
torture-init
+pch-init
set-torture-options $DG_TORTURE_OPTIONS
@@ -59,5 +59,6 @@ if [istarget "*-*-darwin*" ] {
set dg-do-what-default "$old_dg_do_what_default"
# All done.
+pch-finish
torture-finish
dg-finish
--- gcc/testsuite/gcc.dg/pch/pch.exp.jj 2013-01-11 09:02:42.000000000 +0100
+++ gcc/testsuite/gcc.dg/pch/pch.exp 2013-02-15 14:11:27.053896809 +0100
@@ -26,6 +26,7 @@ load_lib torture-options.exp
dg-init
torture-init
set-torture-options $DG_TORTURE_OPTIONS
+pch-init
set old_dg_do_what_default "${dg-do-what-default}"
@@ -59,5 +60,6 @@ file delete $testh
set dg-do-what-default "$old_dg_do_what_default"
# All done.
+pch-finish
torture-finish
dg-finish
--- gcc/testsuite/gcc.dg/pch/valid-1.c.jj 2009-06-08 11:53:48.000000000 +0200
+++ gcc/testsuite/gcc.dg/pch/valid-1.c 2013-02-15 15:19:44.124833259 +0100
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target pch_supported_debug } */
/* { dg-options "-I. -Winvalid-pch -g" } */
#include "valid-1.h"/* { dg-warning "created with -gnone, but used with -g" } */
--- gcc/testsuite/gcc.dg/pch/valid-1.hs.jj 2008-09-05 12:54:26.000000000 +0200
+++ gcc/testsuite/gcc.dg/pch/valid-1.hs 2013-02-15 15:19:50.686794340 +0100
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target pch_supported_debug } */
/* { dg-options "-I. -Winvalid-pch -g0" } */
extern int x;
--- gcc/testsuite/gcc.dg/pch/valid-1b.c.jj 2008-09-05 12:54:26.000000000 +0200
+++ gcc/testsuite/gcc.dg/pch/valid-1b.c 2013-02-15 15:19:55.935763631 +0100
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target pch_supported_debug } */
/* { dg-options "-I. -Winvalid-pch -g0" } */
#include "valid-1b.h"
--- gcc/testsuite/gcc.dg/pch/valid-1b.hs.jj 2008-09-05 12:54:26.000000000 +0200
+++ gcc/testsuite/gcc.dg/pch/valid-1b.hs 2013-02-15 15:20:02.214727794 +0100
@@ -1,3 +1,4 @@
+/* { dg-require-effective-target pch_supported_debug } */
/* { dg-options "-I. -Winvalid-pch -g" } */
extern int x;
Jakub