| # =========================================================================== |
| # http://www.gnu.org/software/autoconf-archive/ax_pthread.html |
| # =========================================================================== |
| # |
| # SYNOPSIS |
| # |
| # AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
| # |
| # DESCRIPTION |
| # |
| # This macro figures out how to build C programs using POSIX threads. It |
| # sets the PTHREAD_LIBS output variable to the threads library and linker |
| # flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
| # flags that are needed. (The user can also force certain compiler |
| # flags/libs to be tested by setting these environment variables.) |
| # |
| # Also sets PTHREAD_CC to any special C compiler that is needed for |
| # multi-threaded programs (defaults to the value of CC otherwise). (This |
| # is necessary on AIX to use the special cc_r compiler alias.) |
| # |
| # NOTE: You are assumed to not only compile your program with these flags, |
| # but also link it with them as well. e.g. you should link with |
| # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
| # |
| # If you are only building threads programs, you may wish to use these |
| # variables in your default LIBS, CFLAGS, and CC: |
| # |
| # LIBS="$PTHREAD_LIBS $LIBS" |
| # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| # CC="$PTHREAD_CC" |
| # |
| # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant |
| # has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name |
| # (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
| # |
| # Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the |
| # PTHREAD_PRIO_INHERIT symbol is defined when compiling with |
| # PTHREAD_CFLAGS. |
| # |
| # ACTION-IF-FOUND is a list of shell commands to run if a threads library |
| # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
| # is not found. If ACTION-IF-FOUND is not specified, the default action |
| # will define HAVE_PTHREAD. |
| # |
| # Please let the authors know if this macro fails on any platform, or if |
| # you have any other suggestions or comments. This macro was based on work |
| # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help |
| # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by |
| # Alejandro Forero Cuervo to the autoconf macro repository. We are also |
| # grateful for the helpful feedback of numerous users. |
| # |
| # Updated for Autoconf 2.68 by Daniel Richard G. |
| # |
| # LICENSE |
| # |
| # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
| # Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG> |
| # |
| # This program is free software: you can redistribute it and/or modify it |
| # under the terms of the GNU General Public License as published by the |
| # Free Software Foundation, either version 3 of the License, or (at your |
| # option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, but |
| # WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| # Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License along |
| # with this program. If not, see <http://www.gnu.org/licenses/>. |
| # |
| # As a special exception, the respective Autoconf Macro's copyright owner |
| # gives unlimited permission to copy, distribute and modify the configure |
| # scripts that are the output of Autoconf when processing the Macro. You |
| # need not follow the terms of the GNU General Public License when using |
| # or distributing such scripts, even though portions of the text of the |
| # Macro appear in them. The GNU General Public License (GPL) does govern |
| # all other use of the material that constitutes the Autoconf Macro. |
| # |
| # This special exception to the GPL applies to versions of the Autoconf |
| # Macro released by the Autoconf Archive. When you make and distribute a |
| # modified version of the Autoconf Macro, you may extend this special |
| # exception to the GPL to apply to your modified version as well. |
| |
| #serial 21 |
| |
| AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) |
| AC_DEFUN([AX_PTHREAD], [ |
| AC_REQUIRE([AC_CANONICAL_HOST]) |
| AC_LANG_PUSH([C]) |
| ax_pthread_ok=no |
| |
| # We used to check for pthread.h first, but this fails if pthread.h |
| # requires special compiler flags (e.g. on True64 or Sequent). |
| # It gets checked for in the link test anyway. |
| |
| # First of all, check if the user has set any of the PTHREAD_LIBS, |
| # etcetera environment variables, and if threads linking works using |
| # them: |
| if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| save_LIBS="$LIBS" |
| LIBS="$PTHREAD_LIBS $LIBS" |
| AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
| AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes]) |
| AC_MSG_RESULT([$ax_pthread_ok]) |
| if test x"$ax_pthread_ok" = xno; then |
| PTHREAD_LIBS="" |
| PTHREAD_CFLAGS="" |
| fi |
| LIBS="$save_LIBS" |
| CFLAGS="$save_CFLAGS" |
| fi |
| |
| # We must check for the threads library under a number of different |
| # names; the ordering is very important because some systems |
| # (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
| # libraries is broken (non-POSIX). |
| |
| # Create a list of thread flags to try. Items starting with a "-" are |
| # C compiler flags, and other items are library names, except for "none" |
| # which indicates that we try without any flags at all, and "pthread-config" |
| # which is a program returning the flags for the Pth emulation library. |
| |
| ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
| |
| # The ordering *is* (sometimes) important. Some notes on the |
| # individual items follow: |
| |
| # pthreads: AIX (must check this before -lpthread) |
| # none: in case threads are in libc; should be tried before -Kthread and |
| # other compiler flags to prevent continual compiler warnings |
| # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
| # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
| # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
| # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
| # -pthreads: Solaris/gcc |
| # -mthreads: Mingw32/gcc, Lynx/gcc |
| # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
| # doesn't hurt to check since this sometimes defines pthreads too; |
| # also defines -D_REENTRANT) |
| # ... -mt is also the pthreads flag for HP/aCC |
| # pthread: Linux, etcetera |
| # --thread-safe: KAI C++ |
| # pthread-config: use pthread-config program (for GNU Pth library) |
| |
| case ${host_os} in |
| solaris*) |
| |
| # On Solaris (at least, for some versions), libc contains stubbed |
| # (non-functional) versions of the pthreads routines, so link-based |
| # tests will erroneously succeed. (We need to link with -pthreads/-mt/ |
| # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather |
| # a function called by this macro, so we could check for that, but |
| # who knows whether they'll stub that too in a future libc.) So, |
| # we'll just look for -pthreads and -lpthread first: |
| |
| ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags" |
| ;; |
| |
| darwin*) |
| ax_pthread_flags="-pthread $ax_pthread_flags" |
| ;; |
| netbsd*) |
| # use libc stubs, don't link against libpthread, to allow |
| # dynamic loading |
| ax_pthread_flags="" |
| ;; |
| esac |
| |
| # Clang doesn't consider unrecognized options an error unless we specify |
| # -Werror. We throw in some extra Clang-specific options to ensure that |
| # this doesn't happen for GCC, which also accepts -Werror. |
| |
| AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags]) |
| save_CFLAGS="$CFLAGS" |
| ax_pthread_extra_flags="-Werror" |
| CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument" |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])], |
| [AC_MSG_RESULT([yes])], |
| [ax_pthread_extra_flags= |
| AC_MSG_RESULT([no])]) |
| CFLAGS="$save_CFLAGS" |
| |
| if test x"$ax_pthread_ok" = xno; then |
| for flag in $ax_pthread_flags; do |
| |
| case $flag in |
| none) |
| AC_MSG_CHECKING([whether pthreads work without any flags]) |
| ;; |
| |
| -*) |
| AC_MSG_CHECKING([whether pthreads work with $flag]) |
| PTHREAD_CFLAGS="$flag" |
| ;; |
| |
| pthread-config) |
| AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no]) |
| if test x"$ax_pthread_config" = xno; then continue; fi |
| PTHREAD_CFLAGS="`pthread-config --cflags`" |
| PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
| ;; |
| |
| *) |
| AC_MSG_CHECKING([for the pthreads library -l$flag]) |
| PTHREAD_LIBS="-l$flag" |
| ;; |
| esac |
| |
| save_LIBS="$LIBS" |
| save_CFLAGS="$CFLAGS" |
| LIBS="$PTHREAD_LIBS $LIBS" |
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags" |
| |
| # Check for various functions. We must include pthread.h, |
| # since some functions may be macros. (On the Sequent, we |
| # need a special flag -Kthread to make this header compile.) |
| # We check for pthread_join because it is in -lpthread on IRIX |
| # while pthread_create is in libc. We check for pthread_attr_init |
| # due to DEC craziness with -lpthreads. We check for |
| # pthread_cleanup_push because it is one of the few pthread |
| # functions on Solaris that doesn't have a non-functional libc stub. |
| # We try pthread_create on general principles. |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> |
| static void routine(void *a) { a = 0; } |
| static void *start_routine(void *a) { return a; }], |
| [pthread_t th; pthread_attr_t attr; |
| pthread_create(&th, 0, start_routine, 0); |
| pthread_join(th, 0); |
| pthread_attr_init(&attr); |
| pthread_cleanup_push(routine, 0); |
| pthread_cleanup_pop(0) /* ; */])], |
| [ax_pthread_ok=yes], |
| []) |
| |
| LIBS="$save_LIBS" |
| CFLAGS="$save_CFLAGS" |
| |
| AC_MSG_RESULT([$ax_pthread_ok]) |
| if test "x$ax_pthread_ok" = xyes; then |
| break; |
| fi |
| |
| PTHREAD_LIBS="" |
| PTHREAD_CFLAGS="" |
| done |
| fi |
| |
| # Various other checks: |
| if test "x$ax_pthread_ok" = xyes; then |
| save_LIBS="$LIBS" |
| LIBS="$PTHREAD_LIBS $LIBS" |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| |
| # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
| AC_MSG_CHECKING([for joinable pthread attribute]) |
| attr_name=unknown |
| for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], |
| [int attr = $attr; return attr /* ; */])], |
| [attr_name=$attr; break], |
| []) |
| done |
| AC_MSG_RESULT([$attr_name]) |
| if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
| AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name], |
| [Define to necessary symbol if this constant |
| uses a non-standard name on your system.]) |
| fi |
| |
| AC_MSG_CHECKING([if more special flags are required for pthreads]) |
| flag=no |
| case ${host_os} in |
| aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";; |
| osf* | hpux*) flag="-D_REENTRANT";; |
| solaris*) |
| if test "$GCC" = "yes"; then |
| flag="-D_REENTRANT" |
| else |
| # TODO: What about Clang on Solaris? |
| flag="-mt -D_REENTRANT" |
| fi |
| ;; |
| esac |
| AC_MSG_RESULT([$flag]) |
| if test "x$flag" != xno; then |
| PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
| fi |
| |
| AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], |
| [ax_cv_PTHREAD_PRIO_INHERIT], [ |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], |
| [[int i = PTHREAD_PRIO_INHERIT;]])], |
| [ax_cv_PTHREAD_PRIO_INHERIT=yes], |
| [ax_cv_PTHREAD_PRIO_INHERIT=no]) |
| ]) |
| AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], |
| [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])]) |
| |
| LIBS="$save_LIBS" |
| CFLAGS="$save_CFLAGS" |
| |
| # More AIX lossage: compile with *_r variant |
| if test "x$GCC" != xyes; then |
| case $host_os in |
| aix*) |
| AS_CASE(["x/$CC"], |
| [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], |
| [#handle absolute path differently from PATH based program lookup |
| AS_CASE(["x$CC"], |
| [x/*], |
| [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], |
| [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) |
| ;; |
| esac |
| fi |
| fi |
| |
| test -n "$PTHREAD_CC" || PTHREAD_CC="$CC" |
| |
| AC_SUBST([PTHREAD_LIBS]) |
| AC_SUBST([PTHREAD_CFLAGS]) |
| AC_SUBST([PTHREAD_CC]) |
| |
| # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
| if test x"$ax_pthread_ok" = xyes; then |
| ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1]) |
| : |
| else |
| ax_pthread_ok=no |
| $2 |
| fi |
| AC_LANG_POP |
| ])dnl AX_PTHREAD |