On Tue, May 10, 2005 at 02:19:32PM +0200, Ralf Ertzinger wrote: > On Tue, May 10, 2005 at 08:12:35AM -0400, Build System wrote: > > > - on x86 and x86_64, use -msse and -msse2 to accomodate newer compilers > > Not that I want to revive the whole .i386.rpm vs. i686.rpm discussion, > but... how does gcc handle these flags? Does it build alternative > code for processors that do not have these features? Or does the binary > not run on anything below PII or compatible? The way it is done in current rawhide's GIMP is definitely wrong. %ifarch %ix86 x86_64 CFLAGS="%optflags -msse -msse2" CXXFLAGS="%optflags -msse -msse2" \ %endif %configure \ a) on x86-64 this is unnecessary, all x86-64's have -msse2 by default b) -msse2 implies -msse c) if you use -msse2 in CFLAGS for all files, you can't run the latest GIMP on e.g. Pentium2, or pre-x86_64 AMD chips. -msse2 should be ONLY used on sources that have SSE/SSE2 stuff in it, and GIMP should make sure that no routine from those sources will be ever called on pre-SSE2 chips Jakub -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/fedora-devel-list
