~drizzle-trunk/drizzle/development

1530.2.1 by Monty Taylor
Updated pandora-build files to version 0.127
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# ===========================================================================
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#              http://autoconf-archive.cryp.to/acx_pthread.html
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# ===========================================================================
779.2.1 by Monty Taylor
Added new pthread m4 file. Changing lib checks to use AC_LIB_HAVE_LINKFLAGS
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#
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# SYNOPSIS
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#
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#   ACX_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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#   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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# LICENSE
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#
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#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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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
1530.2.1 by Monty Taylor
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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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AC_DEFUN([ACX_PTHREAD], [
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_LANG_SAVE
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AC_LANG_C
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acx_pthread_ok=no
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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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# 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=$PTHREAD_CFLAGS])
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        AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
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        AC_MSG_RESULT($acx_pthread_ok)
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        if test x"$acx_pthread_ok" = xno; then
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                PTHREAD_LIBS=""
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                PTHREAD_CFLAGS=""
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        fi
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        LIBS="$save_LIBS"
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        CFLAGS="$save_CFLAGS"
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fi
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# 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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# 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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acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
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# The ordering *is* (sometimes) important.  Some notes on the
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# individual items follow:
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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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case "${host_cpu}-${host_os}" in
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        *solaris*)
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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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        acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
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        ;;
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esac
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if test x"$acx_pthread_ok" = xno; then
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for flag in $acx_pthread_flags; do
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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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                AC_MSG_CHECKING([whether pthreads work with $flag])
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                PTHREAD_CFLAGS="$flag"
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                ;;
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		pthread-config)
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		AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
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		if test x"$acx_pthread_config" = xno; then continue; fi
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		PTHREAD_CFLAGS="`pthread-config --cflags`"
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		PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
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		;;
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                *)
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                AC_MSG_CHECKING([for the pthreads library -l$flag])
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                PTHREAD_LIBS="-l$flag"
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                ;;
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        esac
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        save_LIBS="$LIBS"
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        save_CFLAGS="$CFLAGS"
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        LIBS="$PTHREAD_LIBS $LIBS"
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        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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        # Check for various functions.  We must include pthread.h,
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        # since some functions may be macros.  (On the Sequent, we
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        # need a special flag -Kthread to make this header compile.)
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        # We check for pthread_join because it is in -lpthread on IRIX
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        # while pthread_create is in libc.  We check for pthread_attr_init
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        # due to DEC craziness with -lpthreads.  We check for
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        # pthread_cleanup_push because it is one of the few pthread
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        # functions on Solaris that doesn't have a non-functional libc stub.
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        # We try pthread_create on general principles.
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        AC_TRY_LINK([#include <pthread.h>],
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                    [pthread_t th; pthread_join(th, 0);
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                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
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                     pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
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                    [acx_pthread_ok=yes])
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        LIBS="$save_LIBS"
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        CFLAGS="$save_CFLAGS"
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        AC_MSG_RESULT($acx_pthread_ok)
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        if test "x$acx_pthread_ok" = xyes; then
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                break;
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        fi
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        PTHREAD_LIBS=""
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        PTHREAD_CFLAGS=""
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done
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fi
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# Various other checks:
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if test "x$acx_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 $PTHREAD_CFLAGS"
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        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
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	AC_MSG_CHECKING([for joinable pthread attribute])
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	attr_name=unknown
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	for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
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	    AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
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                        [attr_name=$attr; break])
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	done
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        AC_MSG_RESULT($attr_name)
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        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
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            AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
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                               [Define to necessary symbol if this constant
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                                uses a non-standard name on your system.])
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        fi
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        AC_MSG_CHECKING([if more special flags are required for pthreads])
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        flag=no
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        case "${host_cpu}-${host_os}" in
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            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
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            *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
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        esac
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        AC_MSG_RESULT(${flag})
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        if test "x$flag" != xno; then
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            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
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        fi
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        LIBS="$save_LIBS"
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        CFLAGS="$save_CFLAGS"
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        # More AIX lossage: must compile with xlc_r or cc_r
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	if test x"$GCC" != xyes; then
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          AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
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        else
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          PTHREAD_CC=$CC
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	fi
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else
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        PTHREAD_CC="$CC"
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fi
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AC_SUBST(PTHREAD_LIBS)
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AC_SUBST(PTHREAD_CFLAGS)
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AC_SUBST(PTHREAD_CC)
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# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
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if test x"$acx_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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        acx_pthread_ok=no
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        $2
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fi
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AC_LANG_RESTORE
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])dnl ACX_PTHREAD