target/5212: profiling support for i386-gnu specs file

[Marcus Brinkmann <marcus dot brinkmann at ruhr-uni-bochum dot de>]

>Number:         5212
>Category:       target
>Synopsis:       profiling support for i386-gnu specs file
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 28 10:56:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Marcus Brinkmann
>Release:        3.0.2 (Debian) (Debian testing/unstable)
>Organization:
To organize is to destroy.
>Environment:
System: GNU/Hurd ulysses 2.4.0-test9 #1 Mon Okt 30 20:36:05 CET 2000 i686 unknown
Architecture: i686

	
host: i386-pc-gnu
build: i386-pc-gnu
target: i386-pc-gnu
configured with: ../src/configure -v --enable-languages=c,c++,f77,proto,objc --prefix=/usr --infodir=/share/info --mandir=/share/man --enable-shared --with-gnu-as --with-gnu-ld --with-system-zlib --enable-long-long --enable-nls --without-included-gettext --disable-checking --with-cpp-install-dir=bin --enable-objc-gc i386-gnu
>Description:
I fixed the Hurd specs file to support profiling (which was broken
for statically linked programs).  The specs file I successfully used
is attached, an analysis of what it does (or should do) is in the
table below.  The only relevant part of the specs file (the only
parts which I changed) are "cc1" and "startfile".

The Hurd has the i386-gnu architecture.

To profile the program only:
$ gcc -o main main.c -pg
$ ./main
$ gprof main gmon.out

To profile the program and the C library:
$ gcc -o main main.c -profile
$ ./main
$ gprof main gmon.out

The specs file implement the following option combinations:
Notes: -shared overrides (and prevents) profiling options at the linking
stage
       -profile forces to link the profiling C library statically
       -pg/-p does link to the normal C library (dynamically or statically)

The cc1 option -p is added for all of -p/-pg/-profile (for the first
two automatically, for the third there is a rule in the specs file).

static  shared  pg      p       profile =>lib
Y/N     N       Y/N     Y/N     N       -lc
N       Y       Y/N     Y/N     Y/N     -lc

Y/N     N       Y/N     Y/N     Y       -lc_p

static  shared  pg      p       profile =>startfile
N       N       N       N       N       crt1.o crti.o crtbegin.o
Y       N       N       N       N       crt0.o crti.o crtbegin.o
N       Y       Y/N     Y/N     Y/N     crti.o crtbeginS.o

N       N       Y/N     Y/N     Y       gcrt0.o crti.o crtbegin.o
Y       N       Y/N     Y/N     Y/N     gcrt0.o crti.o crtbegin.o
                ^^^^^^^^^^^^^^^^^^^ at least one Y

N       N       Y/N     Y/N     N       gcrt1.o crti.o crtbegin.o
                ^^^^^^^^^^^ at least one Y
>How-To-Repeat:
	
>Fix:
--- specs.old	Fri Dec 28 19:49:19 2001
+++ specs	Fri Dec 28 19:49:15 2001
@@ -21,7 +21,7 @@
 %{traditional|ftraditional|traditional-cpp:trad}cpp0
 
 *cc1:
-%(cc1_cpu)
+%(cc1_cpu) %{profile:-p}
 
 *cc1_options:
 %{pg:%{fomit-frame-pointer:%e-pg and -fomit-frame-pointer are incompatible}} %1 %{!Q:-quiet} -dumpbase %B %{d*} %{m*} %{a*} %{g*} %{O*} %{W*} %{w} %{pedantic*} %{std*} %{ansi} %{traditional} %{v:-version} %{pg:-p} %{p} %{f*} %{Qn:-fno-ident} %{--help:--help} %{--target-help:--target-help} %{!fsyntax-only:%{S:%W{o*}%{!o*:-o %b.s}}} %{fsyntax-only:-o %j} %{-param*}
@@ -36,13 +36,13 @@
 -m elf_i386 %{shared:-shared}   %{!shared:     %{!static:       %{rdynamic:-export-dynamic}       %{!dynamic-linker:-dynamic-linker /lib/ld.so}}     %{static:-static}}
 
 *lib:
-%{bsd:-lbsd-compat} %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}
+%{bsd:-lbsd-compat} %{shared:-lc}%{!shared:%{profile:-lc_p}%{!profile:-lc}}
 
 *libgcc:
 %{shared-libgcc:-lgcc_s%M -lgcc}%{static-libgcc:-lgcc}%{!shared-libgcc:%{!static-libgcc:%{shared:-lgcc_s%M -lgcc}}}%{!shared-libgcc:%{!static-libgcc:%{!shared:-lgcc}}}
 
 *startfile:
-%{!shared:      %{!static:        %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}}      %{static:crt0.o%s}}    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}
+%{!shared: %{!static: %{profile:gcrt0.o%s} %{!profile:%{pg:gcrt1.o%s}%{!pg:%{p:gcrt1.o%s}%{!p:crt1.o%s}}}}    %{static:  %{profile:gcrt0.o%s} %{!profile:%{pg:gcrt0.o%s}%{!pg:%{p:gcrt0.o%s}%{!p:crt0.o%s}}}}} crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}
 
 *switches_need_spaces:
 
>Release-Note:
>Audit-Trail:
>Unformatted: