Alexander Monakov <amonakov@xxxxxxxxx> writes: > 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? As I see it, --help=target reports the state of the command line options. I agree that this behaviour can be confusing, but I also think it would be difficult to fix in a consistent way across targets. But, yes, I think this would be worth an enhancement request in bugzilla to avoid user confusion. Thanks. Ian
