0 ;/# threadlib.m4 serial 11 (gettext-0.18.2) dnl Copyright (C) 2005-2016 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 From Bruno Haible. dnl gl_THREADLIB dnl ------------ dnl Tests for a multithreading library to be used. dnl If the configure.ac contains a definition of the gl_THREADLIB_DEFAULT_NO dnl (it must be placed before the invocation of gl_THREADLIB_EARLY!), then the dnl default is 'no', otherwise it is system dependent. In both cases, the user dnl can change the choice through the options --enable-threads=choice or dnl --disable-threads. dnl Defines at most one of the macros USE_POSIX_THREADS, USE_SOLARIS_THREADS, dnl USE_PTH_THREADS, USE_WINDOWS_THREADS dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with dnl libtool). dnl Sets the variables LIBMULTITHREAD and LTLIBMULTITHREAD similarly, for dnl programs that really need multithread functionality. The difference dnl between LIBTHREAD and LIBMULTITHREAD is that on platforms supporting weak dnl symbols, typically LIBTHREAD is empty whereas LIBMULTITHREAD is not. dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for dnl multithread-safe programs. AC_DEFUN([gl_THREADLIB_EARLY], [ AC_REQUIRE([gl_THREADLIB_EARLY_BODY]) ]) dnl The guts of gl_THREADLIB_EARLY. Needs to be expanded only once. AC_DEFUN([gl_THREADLIB_EARLY_BODY], [ dnl Ordering constraints: This macro modifies CPPFLAGS in a way that dnl influences the result of the autoconf tests that test for *_unlocked dnl declarations, on AIX 5 at least. Therefore it must come early. AC_BEFORE([$0], [gl_FUNC_GLIBC_UNLOCKED_IO])dnl AC_BEFORE([$0], [gl_ARGP])dnl AC_REQUIRE([AC_CANONICAL_HOST]) dnl _GNU_SOURCE is needed for pthread_rwlock_t on glibc systems. dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes dnl AC_GNU_SOURCE. m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])], [AC_REQUIRE([AC_GNU_SOURCE])]) dnl Check for multithreading. m4_ifdef([gl_THREADLIB_DEFAULT_NO], [m4_divert_text([DEFAULTS], [gl_use_threads_default=no])], [m4_divert_text([DEFAULTS], [gl_use_threads_default=])]) AC_ARG_ENABLE([threads], AC_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ AC_HELP_STRING([--disable-threads], [build without multithread safety])]), [gl_use_threads=$enableval], [if test -n "$gl_use_threads_default"; then gl_use_threads="$gl_use_threads_default" else changequote(,)dnl case "$host_os" in dnl Disable multithreading by default on OSF/1, because it interferes dnl with fork()/exec(): When msgexec is linked with -lpthread, its dnl child process gets an endless segmentation fault inside execvp(). dnl Disable multithreading by default on Cygwin 1.5.x, because it has dnl bugs that lead to endless loops or crashes. See dnl . osf*) gl_use_threads=no ;; cygwin*) case `uname -r` in 1.[0-5].*) gl_use_threads=no ;; *) gl_use_threads=yes ;; esac ;; *) gl_use_threads=yes ;; esac changequote([,])dnl fi ]) if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then # For using : case "$host_os" in osf*) # On OSF/1, the compiler needs the flag -D_REENTRANT so that it # groks . cc also understands the flag -pthread, but # we don't use it because 1. gcc-2.95 doesn't understand -pthread, # 2. putting a flag into CPPFLAGS that has an effect on the linker # causes the AC_LINK_IFELSE test below to succeed u