From: "Alex Vinokur" <alexvn AT bigfoot DOT com>
Newsgroups: comp.os.msdos.djgpp,gnu.gcc.help,gnu.utils.help
Subject: Re: gcc -O3 & gprof
Date: Tue, 18 Mar 2003 06:52:29 +0200
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"Tauno Voipio" <tauno DOT voipio AT iki DOT fi DOT SPAMBAIT_REMOVE DOT invalid> wrote in message news:Oejda.183$Zf2 DOT 42 AT read3 DOT inet DOT fi...
>
> "Alex Vinokur" <alexvn AT bigfoot DOT com> wrote in message
[snip]
> >
> > ========= C code : BEGIN =========
> > /* File main.c */
> >
> > int foo1 (int argc) { return argc; }
> > int foo2 (int argc) { return argc; }
>
> The optimisation -O3 inlines simple functions (like yours here). There are
> no calls to trace.
[snip]

How can we see that ?
For instance, nm doesn't distinguish -O0, -O1, -O2, -O3.

====================
Windows 2000
DJGPP 2.03
GNU gcc/g++ version 3.2.1
GNU nm 2.13
====================

gcc -o a0.exe main.c -g -pg
nm a0.exe | grep foo
000016d0 T _foo1
000016e2 T _foo2

gcc -O1 -o a1.exe main.c -g -pg
nm a1.exe | grep foo
000016d0 T _foo1
000016e2 T _foo2

gcc -O2 -o a2.exe main.c -g -pg
nm a2.exe | grep foo
000016d0 T _foo1
000016f0 T _foo2

gcc -O3 -o a3.exe main.c -g -pg
nm a3.exe | grep foo
000016f0 T _foo1
00001710 T _foo2

   =================================
   Alex Vinokur
     mailto:alexvn AT connect DOT to
     http://www.simtel.net/pub/oth/19088.html
   =================================