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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100347] [11/12 Regression] GCC 11 does not recognize
 skylake; translates "march=native" to "x86_64"
Date: Thu, 06 May 2021 08:00:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100347

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |iains at gcc dot gnu.org

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Iru Cai from comment #6)
> I've checked host_detect_local_cpu() in gcc/config/i386/driver-i386.c. GCC
> detects x86 host CPU micro architecture by cpuid instruction instead of t=
he
> APIs provided by the OS.

But there shouldn't have been any functional changes in the code 10.x vs. 1=
1.x

Erik - does GCC 10.3 actually still work?  Thus, isn't it maybe some OS
restriction on CPUID access, maybe a difference in whether the GCC binaries
are signed or not?

I wonder if you can try

int main()
{
  __builtin_cpu_init ();
  return __builtin_cpu_is ("skylake");
}

with both compilers?=