On Wed, Apr 22, 2009 at 06:30:39AM -0700, Ian Lance Taylor wrote: > Oleg Kravchenko <oleg@xxxxxxxxxx> writes: > > > Why gcc say what mmx, sse, sse2 is disabled? > > > > $ gcc -march=nocona -mtune=nocona --help=target > > They are disabled because you didn't explicitly request them. > > Ian Sorry, Ian, but is this behaviour really intended? These extensions are enabled by gcc/config/i386/i386.c:override_options() for -march=nocona, and if one uses -fverbose-asm, they are really listed as enabled there. IMHO, in this situation behaviour of -Q --help=target and -fverbose-asm seems contradictory and a bit confusing to the user. Perhaps GCC could do better by calling OVERRIDE_OPTIONS (currently in toplev.c:process_options()) before calling decode_options()? Is it worth a bugzilla entry? Thanks. -- Alexander Monakov
