diff options
Diffstat (limited to 'gnulib-m4/pthread-once.m4')
| -rw-r--r-- | gnulib-m4/pthread-once.m4 | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/gnulib-m4/pthread-once.m4 b/gnulib-m4/pthread-once.m4 index 46b8840e..85549254 100644 --- a/gnulib-m4/pthread-once.m4 +++ b/gnulib-m4/pthread-once.m4 @@ -1,23 +1,27 @@ # pthread-once.m4 -# serial 3 -dnl Copyright (C) 2019-2024 Free Software Foundation, Inc. +# serial 6 +dnl Copyright (C) 2019-2025 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. +dnl This file is offered as-is, without any warranty. AC_DEFUN([gl_PTHREAD_ONCE], [ AC_REQUIRE([gl_PTHREAD_H]) AC_REQUIRE([AC_CANONICAL_HOST]) + AC_REQUIRE([gl_PTHREADLIB]) if { case "$host_os" in mingw* | windows*) true;; *) false;; esac; } \ && test $gl_threads_api = windows; then dnl Choose function names that don't conflict with the mingw-w64 winpthreads dnl library. REPLACE_PTHREAD_ONCE=1 + PTHREAD_ONCE_LIB= else if test $HAVE_PTHREAD_H = 0; then HAVE_PTHREAD_ONCE=0 + PTHREAD_ONCE_LIB= else dnl Work around Cygwin 3.5.3 bug. AC_CACHE_CHECK([whether pthread_once works], @@ -31,6 +35,49 @@ AC_DEFUN([gl_PTHREAD_ONCE], *yes) ;; *) REPLACE_PTHREAD_ONCE=1 ;; esac + dnl Determine whether linking requires $(LIBPMULTITHREAD) or only + dnl $(LIBPTHREAD). + if test -z "$LIBPTHREAD" && test -n "$LIBPMULTITHREAD"; then + AC_CACHE_CHECK([whether pthread_once can be used without linking with libpthread], + [gl_cv_func_pthread_once_no_lib], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <pthread.h> + static pthread_once_t a_once = PTHREAD_ONCE_INIT; + static int a; + static void a_init (void) { a = 8647; } + ]], + [[if (pthread_once (&a_once, a_init)) return 1; + if (a != 8647) return 2; + return 0; + ]])], + [gl_cv_func_pthread_once_no_lib=yes], + [gl_cv_func_pthread_once_no_lib=no], + [case "$host_os" in + # Guess no on glibc. + *-gnu* | gnu*) + gl_cv_func_pthread_once_no_lib="guessing no" ;; + # Guess no on FreeBSD. + freebsd* | dragonfly* | midnightbsd*) + gl_cv_func_pthread_once_no_lib="guessing no" ;; + # Guess yes otherwise. + *) + gl_cv_func_pthread_once_no_lib="guessing yes" ;; + esac + ]) + ]) + case "$gl_cv_func_pthread_once_no_lib" in + *yes) PTHREAD_ONCE_LIB="$LIBPTHREAD" ;; + *) PTHREAD_ONCE_LIB="$LIBPMULTITHREAD" ;; + esac + dnl Expected result: + dnl PTHREAD_ONCE_LIB is $(LIBPMULTITHREAD) on glibc < 2.34, FreeBSD. + dnl PTHREAD_ONCE_LIB is $(LIBPTHREAD) in particular on + dnl musl libc, macOS, NetBSD, Solaris, Cygwin, Haiku, Android. + else + PTHREAD_ONCE_LIB="$LIBPTHREAD" + fi fi fi + AC_SUBST([PTHREAD_ONCE_LIB]) ]) |