acinclude.m4

dnl @synopsis AX_CXX_CHECK_LIB(libname, functioname, action-if, action-if-not)
dnl
dnl The standard AC_CHECK_LIB can not test functions in namespaces.
dnl Therefore AC_CHECK_LIB(cgicc, cgicc::Cgicc::getVersion) will always
dnl fail. We need to decompose the functionname into a series of namespaces
dnl where it gets declared so that it can be used for a link test.
dnl
dnl In the first version I did allow namespace::functionname to be a
dnl reference to a void-argument global functionname (just wrapped in a
dnl namespace) like its C counterparts would be - but in reality such
dnl thing does not exist. The only global / static functions are always
dnl made const-functions which is an attribute mangled along into the
dnl library function export name. 
dnl
dnl The normal usage will ask for a test of a class-member function which
dnl should be presented with a full function spec with arguments given in 
dnl parentheses following the function name - if the function to test for 
dnl does expect arguments then you should add default initial values in the 
dnl prototype (even if they do not exist originally, these are used only 
dnl locally to build a correct function call in the configure test script).
dnl
dnl In the current version if you do omit the parenthesis from the macro
dnl argument then the macro will assume that you want to check for the
dnl class name - which is really to check for default constructor being
dnl exported from the given library name. 
dnl
dnl   EXAMPLE:
dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::HTTPCookie])
dnl AX_CXX_CHECK_LIB(cgicc, [cgicc::Cgicc::getVersion () const],
dnl AX_CXX_CHECK_LIB(boost_regex, [boost::RegEx::Position (int i = 0) const])
dnl
dnl Result:
dnl Just as the usual AX_CXX_CHECK_LIB - defines HAVE_LIBCGICC 
dnl and adds the libraries to the default library path (and
dnl uses internally the normal ac_check_lib cache symbol
dnl like ac_cv_lib_cgicc_cgicc__Cgicc)
dnl
dnl Footnote: The C++ language is not good at creating stable library
dnl interfaces at the binary level - a lot of functionality is usually being 
dnl given as inline functions plus there is hardly a chance to create opaque 
dnl types. Therefore most C++ library tests will only do compile tests using
dnl the header files. Doing a check_lib is however good to check the link
dnl dependency before hitting it as an error in the build later.
dnl
dnl @category C++
dnl @author Guido U. Draheim
dnl @vesion 2006-12-18

AC_DEFUN([AX_CXX_CHECK_LIB],
[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
AS_LITERAL_IF([$1],
	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
AC_CACHE_CHECK([for $2 in -l$1], ac_Lib,
[ac_check_lib_save_LIBS=$LIBS
LIBS="-l$1 $5 $LIBS"
case "$2" 
in *::*::*\(*)
AC_LINK_IFELSE([AC_LANG_PROGRAM([
 namespace `echo "$2" | sed -e "s/::.*//"` 
 { class `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/" -e "s/(.*//"` 
   { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
   };
 }
],[`echo "$2" | sed  -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
	       [AS_VAR_SET(ac_Lib, yes)],
	       [AS_VAR_SET(ac_Lib, no)])
;; *::*::*)
AC_LINK_IFELSE([AC_LANG_PROGRAM([
 namespace `echo "$2" | sed -e "s/::.*//"` 
 { namespace `echo "$2" | sed -e "s/.*::\\(.*\\)::.*/\\1/"` 
   { class `echo "$2" | sed -e "s/.*:://"` 
      { public: `echo "$2" | sed -e "s/.*:://"` ();
      };
   }
 }
],[new $2()])],
	       [AS_VAR_SET(ac_Lib, yes)],
	       [AS_VAR_SET(ac_Lib, no)])
;; *::*\(*)
AC_LINK_IFELSE([AC_LANG_PROGRAM([
 class `echo "$2" | sed -e "s/\\(.*\\)::.*/\\1/" -e "s/(.*//"` 
   { public: int `echo "$2" | sed -e "s/.*:://" -e "/(/!s/..*/&()/"`;
   };
],[`echo "$2" | sed  -e "s/(.*//" -e "s/\\(.*\\)::\\(.*\\)/((\\1*)(0))->\\2/g"`()])],
	       [AS_VAR_SET(ac_Lib, yes)],
	       [AS_VAR_SET(ac_Lib, no)])
;; *::*)
AC_LINK_IFELSE([AC_LANG_PROGRAM([
 namespace `echo "$2" | sed -e "s/::.*//"` 
 { class `echo "$2" | sed -e "s/.*:://"`
   { public: `echo "$2" | sed -e "s/.*:://"` ();
   };
 }
],[new $2()])],
	       [AS_VAR_SET(ac_Lib, yes)],
	       [AS_VAR_SET(ac_Lib, no)])
;; *)
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
	       [AS_VAR_SET(ac_Lib, yes)],
	       [AS_VAR_SET(ac_Lib, no)])
;; esac
LIBS=$ac_check_lib_save_LIBS])
AS_IF([test AS_VAR_GET(ac_Lib) = yes],
      [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
  LIBS="-l$1 $LIBS"
])],
      [$4])dnl
AS_VAR_POPDEF([ac_Lib])dnl
])# AC_CHECK_LIB

# ===========================================================================
#           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.

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"
        ;;
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>],
                    [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); ],
                    [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