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* admin/merge-gnulib (GNULIB_MODULES): Add stringeq. With current Gnulib it is already present as in indirect dependency; listing it here because Emacs now depends on it directly. * lib-src/ebrowse.c, lib-src/etags.c: (streq): Remove, as Gnulib defines this now. * lib/fseterr.c, lib/fseterr.h, lib/issymlink.c, lib/issymlink.h: * lib/issymlinkat.c, lib/stdio-consolesafe.c, lib/string.c: * m4/fseterr.m4, m4/gettext_h.m4, m4/stringeq.m4: New files from Gnulib. * src/conf_post.h (tzfree) [__ANDROID_API__ >= 35]: Remove.
212 lines
7.6 KiB
Text
212 lines
7.6 KiB
Text
# pthread_sigmask.m4
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# serial 24
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dnl Copyright (C) 2011-2025 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_FUNC_PTHREAD_SIGMASK],
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[
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AC_REQUIRE([gl_SIGNAL_H_DEFAULTS])
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AC_CHECK_FUNCS_ONCE([pthread_sigmask])
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dnl On MinGW pthread_sigmask is just a macro which always returns 0.
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dnl It does not exist as a real function, which is required by POSIX.
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AC_CACHE_CHECK([whether pthread_sigmask is a macro],
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[gl_cv_func_pthread_sigmask_macro],
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[AC_EGREP_CPP([headers_define_pthread_sigmask], [
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#include <pthread.h>
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#include <signal.h>
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#ifdef pthread_sigmask
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headers_define_pthread_sigmask
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#endif],
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[gl_cv_func_pthread_sigmask_macro=yes],
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[gl_cv_func_pthread_sigmask_macro=no])
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])
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PTHREAD_SIGMASK_LIB=
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if test $gl_cv_func_pthread_sigmask_macro = yes; then
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dnl pthread_sigmask is a dummy macro.
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HAVE_PTHREAD_SIGMASK=0
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dnl Make sure to '#undef pthread_sigmask' before defining it.
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REPLACE_PTHREAD_SIGMASK=1
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else
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dnl Test whether the gnulib module 'threadlib' is in use.
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dnl Some packages like Emacs use --avoid=threadlib.
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dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
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dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
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m4_ifdef([gl_][THREADLIB], [
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AC_REQUIRE([gl_][THREADLIB])
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if test "$gl_threads_api" = posix; then
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if test $ac_cv_func_pthread_sigmask = yes; then
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dnl pthread_sigmask is available without -lpthread.
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:
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else
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if test -n "$LIBMULTITHREAD"; then
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AC_CACHE_CHECK([for pthread_sigmask in $LIBMULTITHREAD],
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[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD],
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[gl_saved_LIBS="$LIBS"
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LIBS="$LIBS $LIBMULTITHREAD"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <pthread.h>
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#include <signal.h>
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]],
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[[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]])
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],
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[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=yes],
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[gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no])
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LIBS="$gl_saved_LIBS"
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])
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if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then
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dnl pthread_sigmask is available with -pthread or -lpthread.
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PTHREAD_SIGMASK_LIB="$LIBMULTITHREAD"
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else
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dnl pthread_sigmask is not available at all.
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HAVE_PTHREAD_SIGMASK=0
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fi
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else
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dnl pthread_sigmask is not available at all.
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HAVE_PTHREAD_SIGMASK=0
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fi
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fi
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else
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dnl pthread_sigmask may exist but does not interoperate with the chosen
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dnl multithreading facility.
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if test $ac_cv_func_pthread_sigmask = yes; then
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REPLACE_PTHREAD_SIGMASK=1
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else
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HAVE_PTHREAD_SIGMASK=0
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fi
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fi
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], [
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dnl The module 'threadlib' is not in use, due to --avoid=threadlib being
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dnl specified.
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dnl The package either has prepared CPPFLAGS and LIBS for use of
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dnl POSIX:2008 threads, or wants to build single-threaded programs.
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if test $ac_cv_func_pthread_sigmask = yes; then
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dnl pthread_sigmask exists and does not require extra libraries.
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dnl Assume that it is declared.
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:
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else
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dnl pthread_sigmask either does not exist or needs extra libraries.
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HAVE_PTHREAD_SIGMASK=0
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dnl Define the symbol rpl_pthread_sigmask, not pthread_sigmask,
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dnl so as to not accidentally override the system's pthread_sigmask
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dnl symbol from libpthread.
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REPLACE_PTHREAD_SIGMASK=1
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fi
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])
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fi
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AC_SUBST([PTHREAD_SIGMASK_LIB])
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dnl For backward compatibility.
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LIB_PTHREAD_SIGMASK="$PTHREAD_SIGMASK_LIB"
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AC_SUBST([LIB_PTHREAD_SIGMASK])
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dnl We don't need a variable LTLIB_PTHREAD_SIGMASK, because when
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dnl "$gl_threads_api" = posix, $LTLIBMULTITHREAD and $LIBMULTITHREAD are the
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dnl same.
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dnl Now test for some bugs in the system function.
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if test $HAVE_PTHREAD_SIGMASK = 1; then
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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dnl On FreeBSD 13.0, MidnightBSD 1.1, HP-UX 11.31, Solaris 9, in programs
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dnl that are not linked with -lpthread, the pthread_sigmask() function
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dnl always returns 0 and has no effect.
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if test -z "$PTHREAD_SIGMASK_LIB"; then
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case " $LIBS " in
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*' -pthread '*) ;;
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*' -lpthread '*) ;;
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*)
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AC_CACHE_CHECK([whether pthread_sigmask works without -lpthread],
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[gl_cv_func_pthread_sigmask_in_libc_works],
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[
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <pthread.h>
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#include <signal.h>
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#include <stddef.h>
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int main ()
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{
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sigset_t set;
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sigemptyset (&set);
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return pthread_sigmask (1729, &set, NULL) != 0;
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}]])],
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[gl_cv_func_pthread_sigmask_in_libc_works=no],
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[gl_cv_func_pthread_sigmask_in_libc_works=yes],
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[
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changequote(,)dnl
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case "$host_os" in
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freebsd* | midnightbsd* | hpux* | solaris | solaris2.[2-9]*)
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gl_cv_func_pthread_sigmask_in_libc_works="guessing no";;
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*)
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gl_cv_func_pthread_sigmask_in_libc_works="guessing yes";;
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esac
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changequote([,])dnl
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])
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])
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case "$gl_cv_func_pthread_sigmask_in_libc_works" in
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*no)
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REPLACE_PTHREAD_SIGMASK=1
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AC_DEFINE([PTHREAD_SIGMASK_INEFFECTIVE], [1],
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[Define to 1 if pthread_sigmask may return 0 and have no effect.])
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;;
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esac;;
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esac
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fi
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dnl On Cygwin 1.7.5, the pthread_sigmask() has a wrong return value
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dnl convention: Upon failure, it returns -1 and sets errno.
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AC_CACHE_CHECK([whether pthread_sigmask returns error numbers],
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[gl_cv_func_pthread_sigmask_return_works],
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[
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gl_saved_LIBS="$LIBS"
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LIBS="$LIBS $PTHREAD_SIGMASK_LIB"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <pthread.h>
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#include <signal.h>
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#include <stddef.h>
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int main ()
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{
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sigset_t set;
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sigemptyset (&set);
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if (pthread_sigmask (1729, &set, NULL) == -1)
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return 1;
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return 0;
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}]])],
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[gl_cv_func_pthread_sigmask_return_works=yes],
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[gl_cv_func_pthread_sigmask_return_works=no],
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[case "$host_os" in
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cygwin*)
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gl_cv_func_pthread_sigmask_return_works="guessing no";;
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*)
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gl_cv_func_pthread_sigmask_return_works="guessing yes";;
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esac
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])
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LIBS="$gl_saved_LIBS"
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])
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case "$gl_cv_func_pthread_sigmask_return_works" in
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*no)
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REPLACE_PTHREAD_SIGMASK=1
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AC_DEFINE([PTHREAD_SIGMASK_FAILS_WITH_ERRNO], [1],
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[Define to 1 if pthread_sigmask(), when it fails, returns -1 and sets errno.])
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;;
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esac
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fi
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])
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# Prerequisite of lib/pthread_sigmask.c.
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AC_DEFUN([gl_PREREQ_PTHREAD_SIGMASK],
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[
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if test $HAVE_PTHREAD_SIGMASK = 1; then
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AC_DEFINE([HAVE_PTHREAD_SIGMASK], [1],
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[Define to 1 if the pthread_sigmask function can be used (despite bugs).])
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fi
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])
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