From 795478398228a93c4fa0f123f26ac547ddbaf86d Mon Sep 17 00:00:00 2001
From: Pietro Incardona <incardon@mpi-cbg.de>
Date: Sun, 12 Jul 2015 00:40:55 +0200
Subject: [PATCH] Adding missing macro
---
m4/acx_pthread.m4 | 242 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 242 insertions(+)
create mode 100755 m4/acx_pthread.m4
diff --git a/m4/acx_pthread.m4 b/m4/acx_pthread.m4
new file mode 100755
index 0000000..508df86
--- /dev/null
+++ b/m4/acx_pthread.m4
@@ -0,0 +1,242 @@
+dnl
+dnl ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+dnl
+dnl Description
+dnl
+dnl This macro figures out how to build C programs using POSIX threads. It
+dnl sets the PTHREAD_LIBS output variable to the threads library and linker
+dnl flags, and the PTHREAD_CFLAGS output variable to any special C compiler
+dnl flags that are needed. (The user can also force certain compiler
+dnl flags/libs to be tested by setting these environment variables.)
+dnl
+dnl Also sets PTHREAD_CC to any special C compiler that is needed for
+dnl multi-threaded programs (defaults to the value of CC otherwise). (This is
+dnl necessary on AIX to use the special cc_r compiler alias.)
+dnl
+dnl NOTE: You are assumed to not only compile your program with these flags,
+dnl but also link it with them as well. e.g. you should link with $PTHREAD_CC
+dnl $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
+dnl
+dnl If you are only building threads programs, you may wish to use these
+dnl variables in your default LIBS, CFLAGS, and CC:
+dnl
+dnl LIBS="$PTHREAD_LIBS $LIBS"
+dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+dnl CC="$PTHREAD_CC"
+dnl
+dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
+dnl has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
+dnl (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+dnl
+dnl ACTION-IF-FOUND is a list of shell commands to run if a threads library
+dnl is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
+dnl is not found. If ACTION-IF-FOUND is not specified, the default action
+dnl will define HAVE_PTHREAD.
+dnl
+dnl Please let the authors know if this macro fails on any platform, or if
+dnl you have any other suggestions or comments. This macro was based on work
+dnl by SGJ on autoconf scripts for FFTW (www.fftw.org) (with help from M.
+dnl Frigo), as well as ac_pthread and hb_pthread macros posted by AFC to the
+dnl autoconf macro repository. We are also grateful for the helpful feedback
+dnl of numerous users.
+dnl
+dnl Version: 1.8 (last modified: 2003-05-21)
+dnl Author: Steven G. Johnson <stevenj@alum.mit.edu> and
+dnl Alejandro Forero Cuervo <bachue@bachue.com>
+dnl
+dnl from http://www.gnu.org/software/ac-archive/htmldoc/index.html
+dnl
+dnl License:
+dnl GNU General Public License
+dnl [http://www.gnu.org/software/ac-archive/htmldoc/COPYING.html]
+dnl with this special exception
+dnl [http://www.gnu.org/software/ac-archive/htmldoc/COPYING-Exception.html].
+dnl
+
+AC_DEFUN([ACX_PTHREAD], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+AC_LANG_SAVE
+AC_LANG_C
+acx_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=$PTHREAD_CFLAGS])
+ AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
+ AC_MSG_RESULT($acx_pthread_ok)
+ if test x"$acx_pthread_ok" = xno; then
+ PTHREAD_LIBS=""
+ PTHREAD_CFLAGS=""
+ fi
+ LIBS="$save_LIBS"
+ CFLAGS="$save_CFLAGS"
+fi
+
+# We must check for the threads library under a number of different
+# names; the ordering is very important because some systems
+# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
+# libraries is broken (non-POSIX).
+
+# Create a list of thread flags to try. Items starting with a "-" are
+# C compiler flags, and other items are library names, except for "none"
+# which indicates that we try without any flags at all.
+
+acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"
+
+# The ordering *is* (sometimes) important. Some notes on the
+# individual items follow:
+
+# pthreads: AIX (must check this before -lpthread)
+# none: in case threads are in libc; should be tried before -Kthread and
+# other compiler flags to prevent continual compiler warnings
+# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
+# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
+# -pthreads: Solaris/gcc
+# -mthreads: Mingw32/gcc, Lynx/gcc
+# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
+# doesn't hurt to check since this sometimes defines pthreads too;
+# also defines -D_REENTRANT)
+# pthread: Linux, etcetera
+# --thread-safe: KAI C++
+
+case "${host_cpu}-${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 -pthread or
+ # -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:
+
+ acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
+ ;;
+esac
+
+if test x"$acx_pthread_ok" = xno; then
+for flag in $acx_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"
+ ;;
+
+ *)
+ 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 $PTHREAD_CFLAGS"
+
+ # Check for various functions. We must include pthread.h,
+ # since some functions may be macros. (On the Sequent, we
+ # need a special flag -Kthread to make this header compile.)
+ # We check for pthread_join because it is in -lpthread on IRIX
+ # while pthread_create is in libc. We check for pthread_attr_init
+ # due to DEC craziness with -lpthreads. We check for
+ # pthread_cleanup_push because it is one of the few pthread
+ # functions on Solaris that doesn't have a non-functional libc stub.
+ # We try pthread_create on general principles.
+ AC_TRY_LINK([#include <pthread.h>],
+ [pthread_t th; pthread_join(th, 0);
+ pthread_attr_init(0); pthread_cleanup_push(0, 0);
+ pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
+ [acx_pthread_ok=yes])
+
+ LIBS="$save_LIBS"
+ CFLAGS="$save_CFLAGS"
+
+ AC_MSG_RESULT($acx_pthread_ok)
+ if test "x$acx_pthread_ok" = xyes; then
+ break;
+ fi
+
+ PTHREAD_LIBS=""
+ PTHREAD_CFLAGS=""
+done
+fi
+
+# Various other checks:
+if test "x$acx_pthread_ok" = xyes; then
+ save_LIBS="$LIBS"
+ LIBS="$PTHREAD_LIBS $LIBS"
+ save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+
+ # Detect AIX lossage: threads are created detached by default
+ # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
+ AC_MSG_CHECKING([for joinable pthread attribute])
+ AC_TRY_LINK([#include <pthread.h>],
+ [int attr=PTHREAD_CREATE_JOINABLE;],
+ ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
+ if test x"$ok" = xunknown; then
+ AC_TRY_LINK([#include <pthread.h>],
+ [int attr=PTHREAD_CREATE_UNDETACHED;],
+ ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
+ fi
+ if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
+ AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
+ [Define to the necessary symbol if this constant
+ uses a non-standard name on your system.])
+ fi
+ AC_MSG_RESULT(${ok})
+ if test x"$ok" = xunknown; then
+ AC_MSG_WARN([we do not know how to create joinable pthreads])
+ fi
+
+ AC_MSG_CHECKING([if more special flags are required for pthreads])
+ flag=no
+ case "${host_cpu}-${host_os}" in
+ *-aix* | *-freebsd*) flag="-D_THREAD_SAFE";;
+ *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
+ esac
+ AC_MSG_RESULT(${flag})
+ if test "x$flag" != xno; then
+ PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
+ fi
+
+ LIBS="$save_LIBS"
+ CFLAGS="$save_CFLAGS"
+
+ # More AIX lossage: must compile with cc_r
+ AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
+else
+ PTHREAD_CC="$CC"
+fi
+
+AC_SUBST(PTHREAD_LIBS)
+AC_SUBST(PTHREAD_CFLAGS)
+AC_SUBST(PTHREAD_CC)
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test x"$acx_pthread_ok" = xyes; then
+ ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
+ :
+else
+ acx_pthread_ok=no
+ $2
+fi
+AC_LANG_RESTORE
+])dnl ACX_PTHREAD
\ No newline at end of file
--
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