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