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[committed] libstdc++: Add comment to <charconv> explaining C++14 status

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: Mon, 17 Feb 2020 16:05:08 +0000
Subject: [committed] libstdc++: Add comment to <charconv> explaining C++14 status

This header is intentionally valid in C++14 mode, because no conforming
C++14 program will try to include <charconv> and so it's OK to add new
(non-reserved in C++14) names to namespace std. However, other headers
must not include <charconv> transitively prior to C++17, so that we
don't add those non-reserved names without the user requesting it.

This adds a comment to the header explaining that.

	* include/std/charconv: Add comment.

Tested powerpc64le-linux, committed to master.

Attachment: patch.txt
Description: Text document

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