libstdc++: Fix macro redefinition warnings

Including <version> after <iterator> gives a warning about redefining
the __cpp_lib_array_constexpr macro. What happens is that <iterator>
sets the C++20 value, then <version> redefines it to the C++17 value,
then undefines it and defines it again to the C++20 value.

This change avoids defining it to the C++17 value when compiling C++20
or later (which also means we no longer need the #undef).

A similar warning happens for __cpp_lib_constexpr_char_traits when
including <version> after any header that includes <bits/char_traits.h>.

libstdc++-v3/ChangeLog:

	* include/std/version (__cpp_lib_array_constexpr)
	(__cpp_lib_constexpr_char_traits): Only define C++17 value when
	compiling C++17.

(cherry picked from commit f903c13ce8674c623f176eaf4516505205fefcf6)

diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index 758b121571be995067cc0633479c5e04ef359f1b..1cb2e4edb75f387df75cfda448784b30f6b4f003 100644 (file)
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -122,12 +122,16 @@
 #if _GLIBCXX_HOSTED
 #define __cpp_lib_any 201606L
 #define __cpp_lib_apply 201603
-#define __cpp_lib_array_constexpr 201803L
+#if __cplusplus == 201703L // N.B. updated value in C++20
+# define __cpp_lib_array_constexpr 201803L
+#endif
 #define __cpp_lib_as_const 201510
 #define __cpp_lib_boyer_moore_searcher 201603
 #define __cpp_lib_chrono 201611
 #define __cpp_lib_clamp 201603
-#define __cpp_lib_constexpr_char_traits 201611L
+#if __cplusplus == 201703L // N.B. updated value in C++20
+# define __cpp_lib_constexpr_char_traits 201611L
+#endif
 #define __cpp_lib_enable_shared_from_this 201603
 #define __cpp_lib_execution 201902L // FIXME: should be 201603L
 #define __cpp_lib_filesystem 201703
@@ -190,8 +194,6 @@
 #define __cpp_lib_unwrap_ref 201811L
 
 #if _GLIBCXX_HOSTED
-#undef __cpp_lib_array_constexpr
-#undef __cpp_lib_constexpr_char_traits
 #define __cpp_lib_array_constexpr 201811L
 #define __cpp_lib_assume_aligned 201811L
 #define __cpp_lib_bind_front 201907L