------- Comment #10 from joseph dot h dot garvin at gmail dot com 2009-06-08
21:18 -------
After encountering this issue and some testing, I think this is definitely a
bug. The problem ONLY occurs when directly returning a call to an atomic
builtin! Assuming no march flags:
Links:
int main()
{
unsigned long test;
return __sync_add_and_fetch(&test, 1);
return (int)test;
}
Does not link:
int main()
{
unsigned long test;
return __sync_add_and_fetch(&test, 1);
}
If you do specify -march=i686, then they both link! If this somehow isn't a
bug, the design is poor, because it's very hard to debug behavior.
$ gcc -v
Reading specs from
/opt/app/g++lib6/gcc-4.2/lib/gcc/i386-pc-solaris2.10/4.2.2/specs
Target: i386-pc-solaris2.10
Configured with: ../configure --prefix=/opt/app/g++lib6/gcc-4.2
--enable-languages=c,c++,fortran,objc --disable-nls --with-included-gettext
--with-gnu-as --with-as=/usr/sfw/bin/gas --with-target-tools=/usr/sfw/bin/
--with-gmp=/opt/app/nonc++/gmp-4.2 --with-mpfr=/opt/app/nonc++/mpfr-2.3
Thread model: posix
gcc version 4.2.2
--
joseph dot h dot garvin at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |joseph dot h dot garvin at
| |gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34115
