From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 948053858C66; Fri,  1 Mar 2024 11:05:53 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 948053858C66
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1709291153;
	bh=gDl293cjHDCJ9XvIHrd4KuAE22Lxm6ExJY60zYxYg5Q=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=xja3ozvsICc/fKIG3G/78eb51W5WcL8b2/aDj8SGUJjHFEdapMj2r1RgtxtPQYEm8
	 vuooZEq7+dT7lHDHdmfSvblUWLJN+flDhMJDk1E/ydYw+LbTaTnqzYkbJsJug4G+78
	 uJX4S/gzhnYiNBmJjq+56eouZZ6Rymy/h5hRjt6I=
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/114181] issubnormal is a macro
Date: Fri, 01 Mar 2024 11:05:51 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-114181-4-ZY2n1Fyppr@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-114181-4@http.gcc.gnu.org/bugzilla/>
References: <bug-114181-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114181

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Libc headers define lots of macros, we don't #undef them in C++ headers unl=
ess
they use the name of a function defined by the C++ library (because C++ says
its library functions must be real functions and must not be hidden by macr=
os).

If you want to provide an implementation of issubnormal (e.g. as
boost::issubnormal) then you need to do:

#include <math.h>
#undef issubnormal

I don't think it's a libstdc++ bug that we don't #undef non-standard macros.

It's certainly not a GCC component=3Dc bug that Glibc defines a macro in its
<math.h>.

So there's no GCC bug here.

Like Andrew said, iff we need to define std::issubnormal then we'll #undef =
it,
but we're not going to do that until we need to.=