* L. A. Walsh: > Is there some sort of "profile-this-cpu-for-pertinent-options" binary > or compiler-option that one should(or could) run on the target > machine in order that the correct compiler switches be set? In recent glibc, ld.so --help (the actual paths to ld.so vary unfortunately) prints supported glibc-hwcaps subdirectories for some common targets. GCC supports a matching -march= or -mcpu= option (the latter for POWER). This does not cover all CPU features exactly, it is a conservative approximation. Cryptographic features and features with a checkered past (features which already have been disabled once in a microcode update) are left out. Thanks, Florian
