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# ===========================================================================
#            http://autoconf-archive.cryp.to/ax_boost_system.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_BOOST_SYSTEM
#
# DESCRIPTION
#
#   Test for System library from the Boost C++ libraries. The macro requires
#   a preceding call to AX_BOOST_BASE. Further documentation is available at
#   <http://randspringer.de/boost/index.html>.
#
#   This macro calls:
#
#     AC_SUBST(BOOST_SYSTEM_LIB)
#
#   And sets:
#
#     HAVE_BOOST_SYSTEM
#
# LAST MODIFICATION
#
#   2008-04-12
#
# COPYLEFT
#
#   Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
#   Copyright (c) 2008 Michael Tindal
#   Copyright (c) 2008 Daniel Casimiro <dan.casimiro@gmail.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.

AC_DEFUN([AX_BOOST_SYSTEM],
[
        AC_ARG_WITH([boost-system],
        AS_HELP_STRING([--with-boost-system@<:@=special-lib@:>@],
                   [use the System library from boost - it is possible to specify a certain library for the linker
                        e.g. --with-boost-system=boost_system-gcc-mt ]),
        [
        if test "$withval" = "no"; then
                        want_boost="no"
        elif test "$withval" = "yes"; then
            want_boost="yes"
            ax_boost_user_system_lib=""
        else
                    want_boost="yes"
                ax_boost_user_system_lib="$withval"
                fi
        ],
        [want_boost="yes"]
        )

        if test "x$want_boost" = "xyes"; then
        AC_REQUIRE([AC_PROG_CC])
        AC_REQUIRE([AC_CANONICAL_BUILD])
                CPPFLAGS_SAVED="$CPPFLAGS"
                CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
                export CPPFLAGS

                LDFLAGS_SAVED="$LDFLAGS"
                LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
                export LDFLAGS

        AC_CACHE_CHECK(whether the Boost::System library is available,
                                           ax_cv_boost_system,
        [AC_LANG_PUSH([C++])
                         CXXFLAGS_SAVE=$CXXFLAGS

                         AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[@%:@include <boost/system/error_code.hpp>]],
                                   [[boost::system::system_category]]),
                   ax_cv_boost_system=yes, ax_cv_boost_system=no)
                         CXXFLAGS=$CXXFLAGS_SAVE
             AC_LANG_POP([C++])
                ])
                if test "x$ax_cv_boost_system" = "xyes"; then
                        AC_SUBST(BOOST_CPPFLAGS)

                        AC_DEFINE(HAVE_BOOST_SYSTEM,,[define if the Boost::System library is available])
            BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`

                        LDFLAGS_SAVE=$LDFLAGS
            if test "x$ax_boost_user_system_lib" = "x"; then
                for libextension in `ls $BOOSTLIBDIR/libboost_system*.{so,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_system.*\)\.so.*$;\1;' -e 's;^lib\(boost_system.*\)\.a*$;\1;'` ; do
                     ax_lib=${libextension}
                                    AC_CHECK_LIB($ax_lib, exit,
                                 [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
                                 [link_system="no"])
                                done
                if test "x$link_system" != "xyes"; then
                for libextension in `ls $BOOSTLIBDIR/boost_system*.{dll,a}* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_system.*\)\.dll.*$;\1;' -e 's;^\(boost_system.*\)\.a*$;\1;'` ; do
                     ax_lib=${libextension}
                                    AC_CHECK_LIB($ax_lib, exit,
                                 [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
                                 [link_system="no"])
                                done
                fi

            else
               for ax_lib in $ax_boost_user_system_lib boost_system-$ax_boost_user_system_lib; do
                                      AC_CHECK_LIB($ax_lib, exit,
                                   [BOOST_SYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_SYSTEM_LIB) link_system="yes"; break],
                                   [link_system="no"])
                  done

            fi
                        if test "x$link_system" = "xno"; then
                                AC_MSG_ERROR(Could not link against $ax_lib !)
                        fi
                fi

                CPPFLAGS="$CPPFLAGS_SAVED"
        LDFLAGS="$LDFLAGS_SAVED"
        fi
])