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[PATCH] Only define __cpp_lib_constexpr_char_traits for C++17

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: Fri, 15 Jun 2018 16:46:56 +0100
Subject: [PATCH] Only define __cpp_lib_constexpr_char_traits for C++17

This macro should not be defined unconditionally.

The macro isn't official (it was proposed in P0426R1 but doesn't
appear in SD-6 or the drafts, or the C++2a working paper) so I haven't
added any tests. Ideally we would have negative tests for each feature
test macro, to make sure they aren't defined when the feature isn't
available. I've done a review and this seems to be the only problem.

	* include/bits/char_traits.h (__cpp_lib_constexpr_char_traits): Only
	define for C++17 and above.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Only define __cpp_lib_constexpr_char_traits for C++17
  - From: Jonathan Wakely

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