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[PATCH] PR libstdc++/80446 cope with libc defining __has_builtin

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Wed, 19 Apr 2017 11:49:07 +0100
Subject: [PATCH] PR libstdc++/80446 cope with libc defining __has_builtin
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Both newlib and FreeBSD have this in libc headers:

#ifndef __has_builtin
#define __has_builtin(x) 0
#endif

This means our attempts to use #ifdef __has_builtin aren't reliable,
so we need a different approach. With this patch we don't care whether
it's defined or not, only its value.

	PR libstdc++/80446
	* include/std/type_traits (is_aggregate): Change __has_builtin checks.
	* libsupc++/new (launder): Likewise.

Tested ppc64le-linux and x86_64-freebsd11.0, committed to trunk.

Attachment: patch.txt
Description: Text document

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  - From: Jonathan Wakely

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