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