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libstdc++: Ignore _GLIBCXX_USE_POSIX_SEMAPHORE if not supported [PR116992]

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If _GLIBCXX_HAVE_POSIX_SEMAPHRE is undefined then users get an error
when defining _GLIBCXX_USE_POSIX_SEMAPHORE. We can just ignore it
instead (and warn them it's being ignored).

This fixes a testsuite failure on hppa64-hp-hpux11.11 (and probably some
other targets):

FAIL: 30_threads/semaphore/platform_try_acquire_for.cc  -std=gnu++20 (test for excess errors)
Excess errors:
semaphore:49: error: '__semaphore_impl' has not been declared

libstdc++-v3/ChangeLog:

	PR libstdc++/116992
	* include/bits/semaphore_base.h (_GLIBCXX_USE_POSIX_SEMAPHORE):
	Undefine and issue a warning if POSIX sem_t is not supported.
	* testsuite/30_threads/semaphore/platform_try_acquire_for.cc:
	Prune new warning.
This commit is contained in:
Jonathan Wakely 2024-10-07 10:22:24 +01:00 committed by Jonathan Wakely
parent e998014d1b
commit 9a5ac633f0
No known key found for this signature in database
2 changed files with 5 additions and 0 deletions
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3
libstdc++-v3/include/bits/semaphore_base.h
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@ -45,6 +45,9 @@
# include <cerrno> // errno, EINTR, EAGAIN etc.
# include <limits.h> // SEM_VALUE_MAX
# include <semaphore.h> // sem_t, sem_init, sem_wait, sem_post etc.
#elif defined(_GLIBCXX_USE_POSIX_SEMAPHORE)
# warning "POSIX semaphore not available, ignoring _GLIBCXX_USE_POSIX_SEMAPHORE"
# undef _GLIBCXX_USE_POSIX_SEMAPHORE
#endif
namespace std _GLIBCXX_VISIBILITY(default)

2
libstdc++-v3/testsuite/30_threads/semaphore/platform_try_acquire_for.cc
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@ -5,3 +5,5 @@
// { dg-add-options libatomic }
#include "try_acquire_for.cc"
// { dg-prune-output "ignoring _GLIBCXX_USE_POSIX_SEMAPHORE" }