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C++ PATCH for libstdc++ test failure in C++17 mode

From: Jason Merrill <jason at redhat dot com>
To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Cc: Jonathan Wakely <jwakely at redhat dot com>
Date: Tue, 25 Oct 2016 13:21:14 -0400
Subject: C++ PATCH for libstdc++ test failure in C++17 mode
Authentication-results: sourceware.org; auth=none

Jonathan recently noticed that 20_util/shared_ptr/cons/constexpr.cc
was failing in C++17 mode.  This was due to the copy elision changes
introducing TARGET_EXPR that wasn't there before, and
maybe_constant_init deciding that it wasn't sufficiently constant.  I
fixed that by looking through the TARGET_EXPR, but that broke
self-assign-test-1.C, because we were optimizing away the
self-assignment of foo and returning the incomplete CONSTRUCTOR that
we were in the process of building up.  I fixed that by making sure
that we don't return an incomplete CONSTRUCTOR as the final value of a
constant expression.

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

Attachment: unique.diff
Description: Text document

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