Pull in r242623 from upstream libc++ trunk (by Eric Fiselier):

  Enable and fix warnings during the build.

  Although CMake adds warning flags, they are ignored in the libc++ headers
  because the headers '#pragma system header' themselves.

  This patch disables the system header pragma when building libc++ and fixes
  the warnings that arose.

  The warnings fixed were:
  1. <memory> - anonymous structs are a GNU extension
  2. <functional> - anonymous structs are a GNU extension.
  3. <__hash_table> - Embedded preprocessor directives have undefined behavior.
  4. <string> - Definition is missing noexcept from declaration.
  5. <__std_stream> - Unused variable.

This should fix building world (in particular libatf-c++) with -std=c++11.

Reported by:	Oliver Hartmann <ohartman@zedat.fu-berlin.de>

1 files changed, 6 insertions, 1 deletions

diff --git a/contrib/libc++/include/string b/contrib/libc++/include/string
index 6be2195..5777ee2 100644
--- a/contrib/libc++/include/string
+++ b/contrib/libc++/include/string
@@ -1936,7 +1936,12 @@ basic_string<_CharT, _Traits, _Allocator>::basic_string()
 template <class _CharT, class _Traits, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
-    : __r_(__a)
+#if _LIBCPP_STD_VER <= 14
+        _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value)
+#else
+        _NOEXCEPT
+#endif
+: __r_(__a)
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
     __get_db()->__insert_c(this);