P0482R5 char8_t: Standard library support

[thirdparty/gcc.git] / libstdc++-v3 / include / bits / c++config

diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 97bb6db70b13b9f168a25374dd4f4c10b6b9913c..9993f4b1998b03f244eb8d84e3af2ce3aa477418 100644 (file)
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -625,6 +625,17 @@ namespace std
 # endif
 #endif
 
+// Unless explicitly specified, enable char8_t extensions only if the core
+// language char8_t feature macro is defined.
+#ifndef _GLIBCXX_USE_CHAR8_T
+# ifdef __cpp_char8_t
+#  define _GLIBCXX_USE_CHAR8_T 1
+# endif
+#endif
+#ifdef _GLIBCXX_USE_CHAR8_T
+# define __cpp_lib_char8_t 201811
+#endif
+
 /* Define if __float128 is supported on this host. */
 #if defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)
 #define _GLIBCXX_USE_FLOAT128