[Bug 294214] clang builtin functions break libm

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 294214] clang builtin functions break libm"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 02 Apr 2026 20:27:31 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294214

Robert Clausecker <fuz@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |fuz@FreeBSD.org

--- Comment #1 from Robert Clausecker <fuz@FreeBSD.org> ---
This is the same story as memcmp().  The C standard does not specify whether +0
or -0 is returned if the two are passed to fmax() or fmin() and compilers will
optimise this.

We should instead document that our libm supports a stricter behaviour than
what
the C standard guarantees (as we did with memcmp()) and recommend that users
pass
-fno-builtin-fmax and -fno-builtin-fmin or use one of the new C23 functions if
they wish to have the stricter behaviour guaranteed.

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