Date: Sat, 23 Nov 2002 18:21:09 +0100 From: Jens Rehsack <rehsack@liwing.de> To: Miguel Mendez <flynn@energyhq.homeip.net> Cc: current@freebsd.org Subject: Re: '-ax' option in gcc Message-ID: <3DDFB905.2030107@liwing.de> References: <20021123174502.703cc4cd.flynn@energyhq.homeip.net>
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Miguel Mendez wrote:
> Hi, subject says it all...
>
> A -CURRENT system as of 11/15:
>
> flynn@christine# cat hello.c
> #include <stdio.h>
> #include <stdlib.h>
>
> int main(int argc, char **argv)
> {
> printf("Hello, foo!\n");
> exit(0);
> }
>
> flynn@christine# env CFLAGS="-pg -ax" make hello
> cc -pg -ax -march=pentiumpro hello.c -o hello
> cc1: unrecognized option `-ax'
> *** Error code 1
>
> Stop in /usr/home/flynn.
>
> Is the -ax option deprecated? It's still present in the man page. No
> problem building such program in a -STABLE box with 2.95
>
> Cheers,
The "-ax" option generates code for profiling. The "-ax" options doesn't
appears in the current info documentation, which is an actual one
(AFAIK). So I assume, "-ax" is not supported anymore.
The are new options for that in gcc3, eg. -fprofile-arcs (for generating
profile information) and -fbranch-probabilities (for optimizing using
profile data).
You may also read http://gcc.gnu.org/ for details 'bout the new compiler
and http://gcc.gnu.org/news/profiledriven.html for information about the
new "Infrastructure for Profile Driven Optimizations".
Bye,
Jens
--
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