# ===========================================================================
#     https://www.gnu.org/software/autoconf-archive/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
#
# LICENSE
#
#   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. This file is offered as-is, without any
#   warranty.

#serial 20

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
    CXXFLAGS=

    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/system/error_code.hpp>]],
        [[boost::system::error_category *a = 0;]])],
                   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 -r $BOOSTLIBDIR/libboost_system* 2>/dev/null | sed 's,.*/lib,,' | sed 's,\..*,,'` ; do
                     ax_lib=${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 -r $BOOSTLIBDIR/boost_system* 2>/dev/null | sed 's,.*/,,' | sed -e 's,\..*,,'` ; do
                     ax_lib=${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$ax_lib" = "x"; then
                AC_MSG_ERROR(Could not find a version of the Boost::System library!)
            fi
   if test "x$link_system" = "xno"; then
    AC_MSG_ERROR(Could not link against $ax_lib !)
   fi
  fi

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