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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/108734] powerpc: False Detection of __atomic_*_8  Builtins
Date: Fri, 10 Feb 2023 09:33:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108734

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to David Edelsohn from comment #5)
> __has_builtin() does not mean that the builtin is inlined.  It only means
> that GCC recognizes the builtin.  That is how __has_builtin() is document=
ed.
> In 32 bit mode, GCC emits an external reference for the builtin: 8 byte
> atomic requires libatomic library, which is not linked by default (and
> shouldn't be).

And this is consistent with e.g. __has_builtin(__builtin_strlen). The fact =
that
GCC recognizes the token "__builtin_strlen" doesn't mean that you don't nee=
d an
extern definition of strlen for cases where the built-in isn't inlined. It's
just that for the atomic built-ins the name of the built-in is the same as =
the
name of the extern function that might be used.=