The Tor Browser: toolkit/crashreporter/google-breakpad/m4/ax

toolkit/crashreporter/google-breakpad/m4/ax_pthread.m4@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/m4/ax_pthread.m4

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 # ===========================================================================
 #           http://www.nongnu.org/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).
 #
 #   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.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
 #
 #   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 6
 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
 AC_DEFUN([AX_PTHREAD], [
 AC_REQUIRE([AC_CANONICAL_HOST])
 AC_LANG_SAVE
 AC_LANG_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_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 -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*)
 	acx_pthread_flags="-pthread $acx_pthread_flags"
 	;;
 esac
 if test x"$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 $PTHREAD_CFLAGS"
         # Check for various functions.  We must include pthread.h,
         # since some functions may be macros.  (On the Sequent, we
         # need a special flag -Kthread to make this header compile.)
         # We check for pthread_join because it is in -lpthread on IRIX
         # while pthread_create is in libc.  We check for pthread_attr_init
         # due to DEC craziness with -lpthreads.  We check for
         # pthread_cleanup_push because it is one of the few pthread
         # functions on Solaris that doesn't have a non-functional libc stub.
         # We try pthread_create on general principles.
         AC_TRY_LINK([#include <pthread.h>
 	             static void routine(void* a) {a=0;}
 	             static void* start_routine(void* a) {return a;}],
                     [pthread_t th; pthread_attr_t attr;
                      pthread_join(th, 0);
                      pthread_attr_init(&attr);
                      pthread_cleanup_push(routine, 0);
                      pthread_create(&th,0,start_routine,0);
                      pthread_cleanup_pop(0); ],
                     [ax_pthread_ok=yes])
         LIBS="$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 $PTHREAD_CFLAGS"
         # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
 	AC_MSG_CHECKING([for joinable pthread attribute])
 	attr_name=unknown
 	for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
 	    AC_TRY_LINK([#include <pthread.h>], [int attr=$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_cpu}-${host_os}" in
             *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
             *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
         esac
         AC_MSG_RESULT(${flag})
         if test "x$flag" != xno; then
             PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
         fi
         LIBS="$save_LIBS"
         CFLAGS="$save_CFLAGS"
         # More AIX lossage: must compile with xlc_r or cc_r
 	if test x"$GCC" != xyes; then
           AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
         else
           PTHREAD_CC=$CC
 	fi
 else
         PTHREAD_CC="$CC"
 fi
 AC_SUBST(PTHREAD_LIBS)
 AC_SUBST(PTHREAD_CFLAGS)
 AC_SUBST(PTHREAD_CC)
 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
 if test x"$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_RESTORE
 ])dnl AX_PTHREAD

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toolkit/crashreporter/google-breakpad/m4/ax_pthread.m4@6474c204b198 (annotated)

toolkit/crashreporter/google-breakpad/m4/ax_pthread.m4