Re: Broken ./configure checks for __cpuid() and __cpuidex()

Michael Paquier <michael(at)paquier(dot)xyz> writes:
> While looking at the surroundings, I have noticed a second check
> that's incorrect in ./configure.ac, with __cpuid(). I may be missing
> something, of course, but these two typos have been introduced by
> 3dc2d62d0486, back in 2015. meson is doing these checks correctly. I
> have not been able to test that on cirrus, it seems to run into
> problems this morning. I don't know much about these instructions,
> but it seems like __get_cpuid_count() and __get_cpuid() are much more
> populate than the two others, so the impact may be lighter than I
> suspect for builds using ./configure.

That's clearly broken. Some quick googling suggests that __cpuid
and __cpuidex are Microsoft-isms, so this would only affect
autoconf-based builds on Windows, which probably explains how we
didn't notice. Still, oughta fix it.

regards, tom lane