http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54419
--- Comment #9 from Ulrich Drepper <drepper.fsp at gmail dot com> 2012-08-31 17:46:41 UTC --- (In reply to comment #8) > Is it clear which are the specific requirements for the various x86* targets? > I'm wondering if after all it's just matter of updating: > http://gcc.gnu.org/install/specific.html Indeed. You cannot use old binutils if any of the code generated by the compiler requires something newer. If these dependencies are not wanted then make the compiler to emit .byte sequences when the new builtins are used. > Since rdrand is only supported on Ivy Bridge processors, shouldn't > src/c++11/random.cc have a fall through using rdtsc in case the processor > doesn't support rdrand? Read the code. There is of course a fall-through for older processors. This is about the code generated by the compiler, not what is used at runtime.
