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Ensure C99 and C11 interfaces are available for C++ [BZ #21326]

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This patch ensures that the C99 and C11 features required by C++ are
defined according to the value of the __cplusplus macro, and not just
because G++ always defines _GNU_SOURCE.  This will allow G++ to stop
defining _GNU_SOURCE some day, without causing the C99 and C11
interfaces to disappear for C++ programs.

	[BZ #21326]
	* include/features.h [__cplusplus >= 201103] (__USE_ISOC99): Define.
	[__cplusplus >= 201703] (__USE_ISOCXX17, __USE_ISOC11): Define.
	* math/Makefile (test-math-cxx11): New test.
	* math/test-math-cxx11.cc: New file.
This commit is contained in:
Jonathan Wakely
2017-10-09 14:58:34 +01:00
committed by Florian Weimer
parent 645ac9aaf8
commit d6c064e914
4 changed files with 182 additions and 7 deletions
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17
include/features.h
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@@ -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