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[PATCH] Define C++17 feature-test macros


This just defines feature-test macros for some C++17 features that we
already support.

	* include/bits/allocator.h (__cpp_lib_incomplete_container_elements):
	Define feature-test macro.
	* include/bits/range_access.h (__cpp_lib_array_constexpr): Likewise.
	* include/std/shared_mutex (__cpp_lib_shared_mutex): Uncomment.
	* include/std/type_traits (__cpp_lib_logical_traits): Fix value.
	(__cpp_lib_type_trait_variable_templates): Define.

Tested powerpc64-linux, committed to trunk.


Attachment: patch.txt
Description: Text document


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