https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100758
--- Comment #2 from Erich Eckner <gcc at eckner dot net> --- We use this in archlinux32 to detect, if we can install packages, that have sse2 opcodes: If one sets "Architecture = auto" in /etc/pacman.conf, uname only gives "i686" in both cases (this is how archlinux does/did the probing), and then, we probe for sse2 to check, if we really are "i686" or "pentium4" (our nomenclature for "i686" + sse2). This works well on amd and intel cpus, but fails on via cpus. Details about expected features: https://archlinux32.org/architecture/ We can add some cumbersome code which probes for sse2, but I'd really prefer some compiler builtin instead :-)
