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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/68081] Cygwin GCC cannot compile program that uses
 __builtin_ia32_rdseed64_step
Date: Sat, 03 Apr 2021 10:22:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D68081

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Can this be closed as invalid? The program can't compile because it tries to
use something that doesn't exist, which is not a GCC bug.

(In reply to Jeffrey Walton from comment #7)
> I thought I was allowed to use documented functions; and I was not suppos=
ed
> to use undocumented ones. Yeah, this seems to be turned on its head :)

Many built-in functions are documented so that authors of other compilers a=
nd
other tools (like static analysis checkers) can implement the same thing in=
 a
compatible way. That doesn't mean users are supposed to use them directly.=