r271418 - in /branches/gcc-8-branch: gcc/cp/Cha...

[redi@gcc.gnu.org]

Author: redi
Date: Mon May 20 13:04:39 2019
New Revision: 271418

URL: https://gcc.gnu.org/viewcvs?rev=271418&root=gcc&view=rev
Log:
PR c++/90532 Ensure __is_constructible(T[]) is false

An array of an unknown bound is an incomplete type, so no object of such
a type can be constructed. This means __is_constructible should always
be false for an array of unknown bound.

This patch also changes the std::is_default_constructible trait to use
std::is_constructible, which now gives the right answer for arrays of
unknown bound.

gcc/cp:

	Backported from mainline
	2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/90532 Ensure __is_constructible(T[]) is false
	* method.c (is_xible_helper): Return error_mark_node for construction
	of an array of unknown bound.

gcc/testsuite:

	Backported from mainline
	2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/90532 Ensure __is_constructible(T[]) is false
	* g++.dg/ext/90532.C: New test.

libstdc++-v3:

	Backported from mainline
	2019-05-20  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/90532 Ensure __is_constructible(T[]) is false
	* include/std/type_traits (__do_is_default_constructible_impl)
	(__is_default_constructible_atom, __is_default_constructible_safe):
	Remove.
	(is_default_constructible): Use is_constructible.
	* testsuite/20_util/is_constructible/value.cc: Check int[] case.
	* testsuite/20_util/is_default_constructible/value.cc: Likewise.
	* testsuite/20_util/is_trivially_constructible/value.cc: Likewise.
	* testsuite/20_util/is_trivially_default_constructible/value.cc:
	Likewise.

Modified:
    branches/gcc-8-branch/libstdc++-v3/ChangeLog
    branches/gcc-8-branch/libstdc++-v3/include/std/type_traits
    branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/is_constructible/value.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/is_default_constructible/value.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/is_trivially_constructible/value.cc
    branches/gcc-8-branch/libstdc++-v3/testsuite/20_util/is_trivially_default_constructible/value.cc

Changes in other areas also in this revision:
Added:
    branches/gcc-8-branch/gcc/testsuite/g++.dg/ext/90532.C
Modified:
    branches/gcc-8-branch/gcc/cp/ChangeLog
    branches/gcc-8-branch/gcc/cp/method.c
    branches/gcc-8-branch/gcc/testsuite/ChangeLog