+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.
+
2023-10-15 Bruno Haible <bruno@clisp.org>
threadlib: Fix link errors on FreeBSD 5.2.1/i386.
-# pthread_mutex_timedlock.m4 serial 2
+# pthread_mutex_timedlock.m4 serial 3
dnl Copyright (C) 2019-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
[
AC_REQUIRE([gl_PTHREAD_H_DEFAULTS])
- AC_CHECK_DECL([pthread_mutex_timedlock], , [HAVE_PTHREAD_MUTEX_TIMEDLOCK=0],
+ AC_CHECK_DECL([pthread_mutex_timedlock],
+ [dnl Test whether the gnulib module 'threadlib' is in use.
+ dnl Some packages like Emacs use --avoid=threadlib.
+ dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
+ dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
+ m4_ifdef([gl_][THREADLIB], [
+ AC_REQUIRE([gl_][THREADLIB])
+ dnl Test whether the function actually exists.
+ dnl FreeBSD 5.2.1 declares it but does not define it.
+ AC_CACHE_CHECK([for pthread_mutex_timedlock],
+ [gl_cv_func_pthread_mutex_timedlock_in_LIBMULTITHREAD],
+ [gl_save_LIBS="$LIBS"
+ LIBS="$LIBS $LIBMULTITHREAD"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <pthread.h>
+ #include <time.h>
+ ]],
+ [[pthread_mutex_t *lock;
+ return pthread_mutex_timedlock (&lock, (struct timespec *) 0);
+ ]])
+ ],
+ [gl_cv_func_pthread_mutex_timedlock_in_LIBMULTITHREAD=yes],
+ [gl_cv_func_pthread_mutex_timedlock_in_LIBMULTITHREAD=no])
+ LIBS="$gl_save_LIBS"
+ ])
+ if test $gl_cv_func_pthread_mutex_timedlock_in_LIBMULTITHREAD != yes; then
+ HAVE_PTHREAD_MUTEX_TIMEDLOCK=0
+ fi
+ ], [
+ :
+ ])
+ ],
+ [HAVE_PTHREAD_MUTEX_TIMEDLOCK=0],
[[#include <pthread.h>]])
])