"Ian Lance Taylor" <iant@xxxxxxxxxx> ??????:m3bqhei86l.fsf@xxxxxxxxxxxxxxxxxxxxxxxx > "Zuxy Meng" <zuxy.meng@xxxxxxxxx> writes: > >> I mean what will gcc do if no '--with-cpu' '--with-arch' '--with-tune' >> etc >> are given during configuration. Specifically for x86, when neither march >> nor >> mtune is given, will gcc merely treat it as march=i386 mtune=i386? > > You need to say precisely how gcc was configured, or you need to tell > us the "Target:" line printed by gcc -v. I got several gcc on various machines. Targets include 'i686-pc-linux', 'mingw32' and 'sparc-sun-solaris2.8', so by default gcc will produce code optimized for i686, i386 and v7? > If the target is, e.g., i386-pc-linux-gnu, and none of the options you > mentioned was specified, then older versions of gcc will tune for the > i386, and recent versions of gcc will tune as though gcc were > configured with --with-tune=generic. -- Zuxy
