[Bug libstdc++/94069] [9 Regression] <shared_mutex> doesn't compile unless PTHREAD_RWLOCK_INITIALIZER is defined

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94069

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:39bdebf3725d7681e5e9ba06e3862f8facef3572

commit r9-8353-g39bdebf3725d7681e5e9ba06e3862f8facef3572
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Mar 6 12:52:51 2020 +0000

    libstdc++: Fix call to __glibcxx_rwlock_init (PR 94069)

    When the target doesn't define PTHREAD_RWLOCK_INITIALIZER we use a
    wrapper around pthread_wrlock_init, but the wrapper only takes one
    argument and we try to call it with two.

    This went unnnoticed on most targets because they do define the
    PTHREAD_RWLOCK_INITIALIZER macro, but it causes a bootstrap failure on
    darwin8.

    Backport from mainline
    2020-03-06  Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/94069
        * include/std/shared_mutex [!PTHREAD_RWLOCK_INITIALIZER]
        (__shared_mutex_pthread::__shared_mutex_pthread()): Remove incorrect
        second argument to __glibcxx_rwlock_init.
        * testsuite/30_threads/shared_timed_mutex/94069.cc: New test.