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-rw-r--r--include/features.h17
1 files changed, 11 insertions, 6 deletions
diff --git a/include/features.h b/include/features.h
index c063b33b49..22735ec117 100644
--- a/include/features.h
+++ b/include/features.h
@@ -76,6 +76,7 @@
__USE_ISOC11 Define ISO C11 things.
__USE_ISOC99 Define ISO C99 things.
__USE_ISOC95 Define ISO C90 AMD1 (C95) things.
+ __USE_ISOCXX11 Define ISO C++11 things.
__USE_POSIX Define IEEE Std 1003.1 things.
__USE_POSIX2 Define IEEE Std 1003.2 things.
__USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
@@ -238,13 +239,17 @@
# define __USE_ISOC95 1
#endif
+#ifdef __cplusplus
+/* This is to enable compatibility for ISO C++17. */
+# if __cplusplus >= 201703L
+# define __USE_ISOC11 1
+# endif
/* This is to enable compatibility for ISO C++11.
-
- So far g++ does not provide a macro. Check the temporary macro for
- now, too. */
-#if ((defined __cplusplus && __cplusplus >= 201103L) \
- || defined __GXX_EXPERIMENTAL_CXX0X__)
-# define __USE_ISOCXX11 1
+ Check the temporary macro for now, too. */
+# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__
+# define __USE_ISOCXX11 1
+# define __USE_ISOC99 1
+# endif
#endif
/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE