r277458 - in /trunk/libstdc++-v3: ChangeLog inc...

[redi@gcc.gnu.org]

Author: redi
Date: Fri Oct 25 17:02:35 2019
New Revision: 277458

URL: https://gcc.gnu.org/viewcvs?rev=277458&root=gcc&view=rev
Log:
Fix compilation with Clang

The new constexpr destructor on std::allocator breaks compilation with
Clang in C++2a mode. This only makes it constexpr if the compiler
supports the P0784R7 features.

	* include/bits/allocator.h: Check __cpp_constexpr_dynamic_alloc
	before making the std::allocator destructor constexpr.
	* testsuite/20_util/allocator/requirements/constexpr.cc: New test.

Added:
    trunk/libstdc++-v3/testsuite/20_util/allocator/requirements/constexpr.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/allocator.h