pthread*: Fix link errors on FreeBSD 5.2.1/i386

[Bruno Haible]

On FreeBSD 5.2.1/i386, I see these link errors:

../gllib/libgnu.a(mtx.o): In function `mtx_timedlock':
/usr/home/bruno/testdir-all/build/gllib/../../gllib/mtx.c:257: undefined 
reference to `pthread_mutex_timedlock'
gmake[4]: *** [test-mtx] Error 1

test-pthread-spin.o: In function `lock_mutator_thread':
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:122: 
undefined reference to `pthread_spin_lock'
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:132: 
undefined reference to `pthread_spin_unlock'
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:136: 
undefined reference to `pthread_spin_lock'
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:138: 
undefined reference to `pthread_spin_unlock'
test-pthread-spin.o: In function `lock_checker_thread':
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:156: 
undefined reference to `pthread_spin_lock'
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:158: 
undefined reference to `pthread_spin_unlock'
test-pthread-spin.o: In function `main':
/home/bruno/testdir-all/build/gltests/../../gltests/test-pthread-spin.c:209: 
undefined reference to `pthread_spin_init'
gmake[4]: *** [test-pthread-spin] Error 1

The cause is similar: FreeBSD declares these functions in <pthread.h>, but
does not actually define them in libthr.so.

These two patches corrects the configuration results accordingly.


2023-10-15  Bruno Haible  <bruno@clisp.org>

        pthread-spin: Fix link errors on FreeBSD 5.2.1/i386.
        * m4/pthread-spin.m4 (gl_PTHREAD_SPIN): Test not only whether
        <pthread.h> defines the pthread_spinlock_t type, but also whether the
        function pthread_spin_init is actually defined.

2023-10-15  Bruno Haible  <bruno@clisp.org>

        pthread_mutex_timedlock: Fix link errors on FreeBSD 5.2.1/i386.
        * m4/pthread_mutex_timedlock.m4 (gl_FUNC_PTHREAD_MUTEX_TIMEDLOCK): Test
        not only whether pthread_mutex_timedlock is declared, but also whether
        it is actually defined.

0001-pthread_mutex_timedlock-Fix-link-errors-on-FreeBSD-5.patch
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0002-pthread-spin-Fix-link-errors-on-FreeBSD-5.2.1-i386.patch
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