Changes to m4/ax_pthread.m4. All files

m4/ax_pthread.m4

new file mode 100644@@ -0,0 +1,332 @@+# ===========================================================================+#        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 $ax_pthread_flags"+        ;;+esac++# Clang doesn't consider unrecognized options an error unless we specify+# -Werror. We throw in some extra Clang-specific options to ensure that+# this doesn't happen for GCC, which also accepts -Werror.++AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])+save_CFLAGS="$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