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C++ PATCH for C++17 constexpr if

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Cc: Ville Voutilainen <ville dot voutilainen at gmail dot com>
Date: Wed, 10 Aug 2016 17:57:38 -0400
Subject: C++ PATCH for C++17 constexpr if
Authentication-results: sourceware.org; auth=none

This patch implements the C++17 constexpr if feature.  The primary use
is in templates, where the non-taken branch of the constexpr
if-statement is not instantiated.  But it can also be used outside of
templates, where the branches are parsed and discarded, and discarded
return statements are not used for return type deduction.

constexpr if is also active with a pedwarn in C++11 and C++14.

Tested x86_64-pc-linux-gnu, applying to trunk.

Attachment: cx-if.diff
Description: Text document

Follow-Ups:
- Re: C++ PATCH for C++17 constexpr if
  - From: Jason Merrill

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