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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2F'>libwebp</a>/<a href='?path=%2Fbig%2FSRC%2Flibwebp%2Fm4%2F'>m4</a>/</p><hr><h3>✏️ Editing: ax_pthread.m4</h3>  
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            <textarea name='content' rows='20'># ===========================================================================
#        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 $LIBS
#
#   If you are only building threads programs, you may wish to use these
#   variables in your default LIBS, CFLAGS, and CC:
#
#     LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
#     CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
#     CC=&quot;$PTHREAD_CC&quot;
#
#   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 &lt;stevenj@alum.mit.edu&gt;
#   Copyright (c) 2011 Daniel Richard G. &lt;skunk@iSKUNK.ORG&gt;
#
#   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 &lt;http://www.gnu.org/licenses/&gt;.
#
#   As a special exception, the respective Autoconf Macro&#039;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&quot;$PTHREAD_LIBS$PTHREAD_CFLAGS&quot; != x; then
        save_CFLAGS=&quot;$CFLAGS&quot;
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;
        save_LIBS=&quot;$LIBS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
        AC_MSG_CHECKING([for pthread_join in LIBS=$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&quot;$ax_pthread_ok&quot; = xno; then
                PTHREAD_LIBS=&quot;&quot;
                PTHREAD_CFLAGS=&quot;&quot;
        fi
        LIBS=&quot;$save_LIBS&quot;
        CFLAGS=&quot;$save_CFLAGS&quot;
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 &quot;-&quot; are
# C compiler flags, and other items are library names, except for &quot;none&quot;
# which indicates that we try without any flags at all, and &quot;pthread-config&quot;
# which is a program returning the flags for the Pth emulation library.

ax_pthread_flags=&quot;pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config&quot;

# 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&#039;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&#039;ll stub that too in a future libc.)  So,
        # we&#039;ll just look for -pthreads and -lpthread first:

        ax_pthread_flags=&quot;-pthreads pthread -mt -pthread $ax_pthread_flags&quot;
        ;;

        darwin*)
        ax_pthread_flags=&quot;-pthread $ax_pthread_flags&quot;
        ;;
esac

# Clang doesn&#039;t consider unrecognized options an error unless we specify
# -Werror. We throw in some extra Clang-specific options to ensure that
# this doesn&#039;t happen for GCC, which also accepts -Werror.

AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
save_CFLAGS=&quot;$CFLAGS&quot;
ax_pthread_extra_flags=&quot;-Werror&quot;
CFLAGS=&quot;$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument&quot;
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])],
                  [AC_MSG_RESULT([yes])],
                  [ax_pthread_extra_flags=
                   AC_MSG_RESULT([no])])
CFLAGS=&quot;$save_CFLAGS&quot;

if test x&quot;$ax_pthread_ok&quot; = 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 $flag])
                PTHREAD_CFLAGS=&quot;$flag&quot;
                ;;

                pthread-config)
                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
                if test x&quot;$ax_pthread_config&quot; = xno; then continue; fi
                PTHREAD_CFLAGS=&quot;`pthread-config --cflags`&quot;
                PTHREAD_LIBS=&quot;`pthread-config --ldflags` `pthread-config --libs`&quot;
                ;;

                *)
                AC_MSG_CHECKING([for the pthreads library -l$flag])
                PTHREAD_LIBS=&quot;-l$flag&quot;
                ;;
        esac

        save_LIBS=&quot;$LIBS&quot;
        save_CFLAGS=&quot;$CFLAGS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags&quot;

        # 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&#039;t have a non-functional libc stub.
        # We try pthread_create on general principles.
        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include &lt;pthread.h&gt;
                        static void routine(void *a) { a = 0; }
                        static void *start_routine(void *a) { return a; }],
                       [pthread_t th; pthread_attr_t attr;
                        pthread_create(&amp;th, 0, start_routine, 0);
                        pthread_join(th, 0);
                        pthread_attr_init(&amp;attr);
                        pthread_cleanup_push(routine, 0);
                        pthread_cleanup_pop(0) /* ; */])],
                [ax_pthread_ok=yes],
                [])

        LIBS=&quot;$save_LIBS&quot;
        CFLAGS=&quot;$save_CFLAGS&quot;

        AC_MSG_RESULT([$ax_pthread_ok])
        if test &quot;x$ax_pthread_ok&quot; = xyes; then
                break;
        fi

        PTHREAD_LIBS=&quot;&quot;
        PTHREAD_CFLAGS=&quot;&quot;
done
fi

# Various other checks:
if test &quot;x$ax_pthread_ok&quot; = xyes; then
        save_LIBS=&quot;$LIBS&quot;
        LIBS=&quot;$PTHREAD_LIBS $LIBS&quot;
        save_CFLAGS=&quot;$CFLAGS&quot;
        CFLAGS=&quot;$CFLAGS $PTHREAD_CFLAGS&quot;

        # 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 &lt;pthread.h&gt;],
                           [int attr = $attr; return attr /* ; */])],
                [attr_name=$attr; break],
                [])
        done
        AC_MSG_RESULT([$attr_name])
        if test &quot;$attr_name&quot; != 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 ${host_os} in
            aix* | freebsd* | darwin*) flag=&quot;-D_THREAD_SAFE&quot;;;
            osf* | hpux*) flag=&quot;-D_REENTRANT&quot;;;
            solaris*)
            if test &quot;$GCC&quot; = &quot;yes&quot;; then
                flag=&quot;-D_REENTRANT&quot;
            else
                # TODO: What about Clang on Solaris?
                flag=&quot;-mt -D_REENTRANT&quot;
            fi
            ;;
        esac
        AC_MSG_RESULT([$flag])
        if test &quot;x$flag&quot; != xno; then
            PTHREAD_CFLAGS=&quot;$flag $PTHREAD_CFLAGS&quot;
        fi

        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
            [ax_cv_PTHREAD_PRIO_INHERIT], [
                AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include &lt;pthread.h&gt;]],
                                                [[int i = PTHREAD_PRIO_INHERIT;]])],
                    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
                    [ax_cv_PTHREAD_PRIO_INHERIT=no])
            ])
        AS_IF([test &quot;x$ax_cv_PTHREAD_PRIO_INHERIT&quot; = &quot;xyes&quot;],
            [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])])

        LIBS=&quot;$save_LIBS&quot;
        CFLAGS=&quot;$save_CFLAGS&quot;

        # More AIX lossage: compile with *_r variant
        if test &quot;x$GCC&quot; != xyes; then
            case $host_os in
                aix*)
                AS_CASE([&quot;x/$CC&quot;],
                  [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([&quot;x$CC&quot;],
                     [x/*],
                     [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC=&quot;${CC}_r&quot;])],
                     [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
                ;;
            esac
        fi
fi

test -n &quot;$PTHREAD_CC&quot; || PTHREAD_CC=&quot;$CC&quot;

AC_SUBST([PTHREAD_LIBS])
AC_SUBST([PTHREAD_CFLAGS])
AC_SUBST([PTHREAD_CC])

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x&quot;$ax_pthread_ok&quot; = 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
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