Re: gcc 4.2 profiling breaks argv

On Fri, Aug 03, 2007 at 01:53:20PM +1000, Nick Frampton wrote:
> Hi all,
>
> Programs segfault when attempting to access argv from main when compiled 
> under gcc 4.2.0 with the -pg profiling option.  The following program 
> illustrates this problem.
>
> $ cat test.c
> #include <stdio.h>
> int main (int argc, char **argv) {
>   fprintf (stderr, "argv=%p\n", argv);
>   return 0;
> }
> $ cc -c -o test.o -pg  test.c  &&  cc -o test  -pg  test.o
> $ ./test
> Segmentation fault (core dumped)
>
> $ cc -v
> Using built-in specs.
> Target: i386-undermydesk-freebsd
> Configured with: FreeBSD/i386 system compiler
> Thread model: posix
> gcc version 4.2.0 20070514 [FreeBSD]
>
> $ uname -a
> FreeBSD test03.statseeker.com 7.0-CURRENT FreeBSD 7.0-CURRENT #1: Fri Aug  
> 3 11:07:03 EST 2007     
> root_at_test03.statseeker.com:/usr/obj/usr/src/sys/GENERIC  i386
>
> This issue was reported on this list on 5th July 2007 by Garrett Cooper but 
> argv was not mentioned in that post.  I have not seen this problem reported 
> elsewhere (e.g. on the gcc mailing list).
>
> -Nick
> **

FWIW, I can't reproduce it on amd64:

> cc -c -o test.o -pg test.c && cc -o test -pg test.o
> ./test
argv=0x7fffffffe8b0
> cc -v
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.0 20070514 [FreeBSD]


Yuri