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gcc/libstdc++-v3
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Jonathan Wakely 61c71a6245 libstdc++: Define (and use) _GLIBCXX_HAVE_ATOMIC_WAIT 
In order to simplify the preprocessor checks for whether __atomic_wait
is available, this commit does:

-#if defined _GLIBCXX_HAS_GTHREADS || _GLIBCXX_HAVE_LINUX_FUTEX
+#ifdef _GLIBCXX_HAVE_ATOMIC_WAIT

The original was wrong anyway, as it should have used 'defined' to check
_GLIBCXX_HAVE_LINUX_FUTEX (for consistency with how that's used
elsewhere).

The new macro is defined in <bits/atomic_wait.h> when the file is
defines __atomic_wait and related facilities. All other code that
depends on those features can just check the one macro.

libstdc++-v3/ChangeLog:

	* include/bits/atomic_wait.h (_GLIBCXX_HAVE_ATOMIC_WAIT):
	Define.
	* include/bits/atomic_base.h: Check _GLIBCXX_HAVE_ATOMIC_WAIT.
	* include/bits/atomic_timed_wait.h: Likewise.
	* include/bits/semaphore_base.h: Likewise.
	* include/std/atomic: Likewise.
	* include/std/latch: Likewise.
	* include/std/semaphore: Likewise.
2020-11-26 23:53:09 +00:00
..
config libstdc++: Avoid calling undefined __gthread_self weak symbol [PR 95989] 2020-11-19 21:07:06 +00:00
doc ada: c++: Get rid of libposix4, librt on Solaris 2020-11-26 13:01:30 +01:00
include libstdc++: Define (and use) _GLIBCXX_HAVE_ATOMIC_WAIT 2020-11-26 23:53:09 +00:00
libsupc++ libstdc++: Use 'inline' consistently in std::exception_ptr [PR 97729] 2020-11-09 14:28:38 +00:00
po libstdc++: Regenerate makefiles 2020-06-23 07:59:40 +01:00
python libstdc++: Fix compatibility support in unique_ptr pretty printer 2020-08-10 18:47:06 +01:00
scripts libstdc++: Pass CXXFLAGS to check_performance script 2020-10-09 14:01:55 +01:00
src libstdc++: Encapsulate __gthread_cond_t as std::__condvar 2020-11-25 18:24:13 +00:00
testsuite libstc++: Fix typo in new check_effective_target_gthreads proc 2020-11-26 21:43:18 +00:00
acinclude.m4 ada: c++: Get rid of libposix4, librt on Solaris 2020-11-26 13:01:30 +01:00
aclocal.m4
ChangeLog Daily bump. 2020-11-26 00:16:41 +00:00
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config.h.in libstdc++: Add configure checks for semaphores 2020-11-23 18:12:39 +00:00
configure ada: c++: Get rid of libposix4, librt on Solaris 2020-11-26 13:01:30 +01:00
configure.ac libstdc++: Add std::from_chars for floating-point types 2020-07-20 23:49:27 +01:00
configure.host Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
crossconfig.m4 Scope libstdc++ configuration for vxworks to all versions 2020-10-22 16:40:57 +00:00
fragment.am
linkage.m4
Makefile.am build: Use -include instead of conditional include. 2020-06-22 21:31:48 +00:00
Makefile.in build: Use -include instead of conditional include. 2020-06-22 21:31:48 +00:00
README

README 

file: libstdc++-v3/README

New users may wish to point their web browsers to the file
index.html in the 'doc/html' subdirectory.  It contains brief
building instructions and notes on how to configure the library in
interesting ways.