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Re: Add workaround to std::variant for Clang bug 31852

From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 5 Apr 2018 17:59:29 +0100
Subject: Re: Add workaround to std::variant for Clang bug 31852
References: <CAH6eHdR5Wc+shTzVGkGY3rWg6mKNwcGGSPy2Hxct=PyRQJwYeA@mail.gmail.com>

On 26 March 2018 at 14:10, Jonathan Wakely wrote:
> This makes it possible to use our std::variant with Clang, as well as
> some minor tweaks to avoid ADL (so the compiler doesn't waste time
> looking in associated namespaces) and adjust whitespace.
>
>        * include/std/variant (__get): Qualify calls to avoid ADL.
>        (__select_index): Adjust whitespace.
>        (variant): Add using-declaration to workaround Clang bug.
>
> Tested powerpc64le-linux, committed to trunk.. I'll backport to
> gcc-7-branch too.

The Clang bug means that __get is ambiguous (because it thinks the
friend declaration is a separate overload) so we also need this
change.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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