Fwd: [PATCH,libstdc++] C++ constexpr tuple is broken.

[Ed Smith-Rowland via gcc-patches]

I missed a file in my recent patch for C++20 constexpr tuple. Bestrafe Mich.

Ed



2019-11-16  Edward Smith-Rowland  <3dw...@verizon.net>

	Repair the <tuple> part of C++20 p1032 Misc constexpr bits.
	* include/bits/uses_allocator.h (__uses_alloc0::_Sink::operaror=)
	(__use_alloc(const _Alloc&)) : Constexpr.



Index: include/bits/uses_allocator.h
===================================================================
--- include/bits/uses_allocator.h	(revision 278366)
+++ include/bits/uses_allocator.h	(working copy)
@@ -72,7 +72,7 @@
 
   struct __uses_alloc0 : __uses_alloc_base
   {
-    struct _Sink { void operator=(const void*) { } } _M_a;
+    struct _Sink { void _GLIBCXX20_CONSTEXPR operator=(const void*) { } } _M_a;
   };
 
   template<typename _Alloc>
@@ -109,6 +109,7 @@
       __uses_alloc<uses_allocator<_Tp, _Alloc>::value, _Tp, _Alloc, _Args...>;
 
   template<typename _Tp, typename _Alloc, typename... _Args>
+    _GLIBCXX20_CONSTEXPR
     inline __uses_alloc_t<_Tp, _Alloc, _Args...>
     __use_alloc(const _Alloc& __a)
     {