According to gcc 4.1 manual, __sync_add_and fetch is builtin for this version, so it should works on 4.2 too.
I have not old Xcode on hands, only Xcode4/Xcode5 (llvm based), but this code compiles and links fine on my FreeBSD with gcc 4.2.1 (in both 32-bit and 64-bit mode):
int main()
{
int _exitflag=0;
if( __sync_add_and_fetch(&_exitflag,0))
return 1;
return 0;
}
May be, you need to specify processor target (-march=core2duo because OS X requires at least core2duo)
According to gcc 4.1 manual, __sync_add_and fetch is builtin for this version, so it should works on 4.2 too.
I have not old Xcode on hands, only Xcode4/Xcode5 (llvm based), but this code compiles and links fine on my FreeBSD with gcc 4.2.1 (in both 32-bit and 64-bit mode):
int main() { int _exitflag=0; if( __sync_add_and_fetch(&_exitflag,0)) return 1; return 0; }May be, you need to specify processor target (-march=core2duo because OS X requires at least core2duo)