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[PATCH] PR libstdc++/86398 fix std::is_trivially_constructible regression

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: Wed, 4 Jul 2018 10:02:04 +0100
Subject: [PATCH] PR libstdc++/86398 fix std::is_trivially_constructible regression

The intrinsic doesn't check for allowed conversions between scalar
types, so restore the std::is_constructible check.

Also make some trivial whitespace changes.

	PR libstdc++/86398
	* include/std/type_traits (is_trivially_constructible): Check
	is_constructible before __is_trivially_constructible.
	* testsuite/20_util/is_trivially_constructible/value.cc: Add more
	tests, including negative cases.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Use
	zero for dg-error lineno.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.

I got sick of repeatedly adjusting the dg-error lines in the
make_signed/make_unsigned tests so have just changed them to match any
line.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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