# Configure paths for ARTS
# Philip Stadermann   2001-06-21
# stolen from esd.m4
#
# Christian Schoenebeck  2006-02-09
# modified to work for a C++ environment

dnl --------------------------------------------------------------------------
dnl AM_PATH_ARTS([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for ARTS, and define ARTS_CFLAGS and ARTS_LIBS
dnl --------------------------------------------------------------------------
AC_DEFUN([AM_PATH_ARTS],
[dnl 
dnl Get the cflags and libraries from the artsc-config script
dnl
AC_ARG_WITH(arts-prefix, AC_HELP_STRING([--with-arts-prefix=DIR], [prefix where ARTS is installed (optional)]),
            arts_prefix="$withval", arts_prefix="")
AC_ARG_ENABLE(artstest, AC_HELP_STRING([--disable-artstest], [do not try to compile and run a test ARTS program]),
            enable_artstest=$enableval, enable_artstest=yes)

  if test x$arts_prefix != x ; then
     arts_args="$arts_args --arts-prefix=$arts_prefix"
     if test x${ARTS_CONFIG+set} != xset ; then
        ARTS_CONFIG=$arts_prefix/bin/artsc-config
     fi
  fi

  AC_LANG_SAVE
  AC_LANG_C

  AC_PATH_TOOL(ARTS_CONFIG, artsc-config, no)
  
  min_arts_version=ifelse([$1], ,0.9.5,$1)
  AC_MSG_CHECKING(for ARTS artsc - version >= $min_arts_version)
  no_arts=""
  if test "$ARTS_CONFIG" = "no" ; then
    no_arts=yes
  else
    ARTS_CFLAGS=`$ARTS_CONFIG $artsconf_args --cflags`
    ARTS_LIBS=`$ARTS_CONFIG $artsconf_args --libs`

    arts_major_version=`$ARTS_CONFIG $arts_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    arts_minor_version=`$ARTS_CONFIG $arts_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    arts_micro_version=`$ARTS_CONFIG $arts_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    if test "x$enable_artstest" = "xyes" ; then
      ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $ARTS_CFLAGS"
      LIBS="$LIBS $ARTS_LIBS"
dnl
dnl Check if the installed ARTS is actually available -- when cross-compiling,
dnl we have probably detected the build system's version of artsc-config
dnl
      AC_CHECK_LIB([artsc], [arts_init], [], [no_arts=yes], [$ARTS_LIBS])

dnl
dnl Now check if the installed ARTS is sufficiently new. (Also sanity
dnl checks the results of artsc-config to some extent)
dnl
      rm -f conf.artstest
      AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <artsc.h>

char*
my_strdup (char *str)
{
  char *new_str;
  
  if (str)
    {
      new_str = malloc ((strlen (str) + 1) * sizeof(char));
      strcpy (new_str, str);
    }
  else
    new_str = NULL;
  
  return new_str;
}

int main ()
{
  int major, minor, micro;
  char *tmp_version;

  system ("touch conf.artstest");

  /* HP/UX 9 (%@#!) writes to sscanf strings */
  tmp_version = my_strdup("$min_arts_version");
  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
     printf("%s, bad version string\n", "$min_arts_version");
     exit(1);
   }

   if (($arts_major_version > major) ||
      (($arts_major_version == major) && ($arts_minor_version > minor)) ||
      (($arts_major_version == major) && ($arts_minor_version == minor) && ($arts_micro_version >= micro)))
    {
      return 0;
    }
  else
    {
      printf("\n*** 'artsc-config --version' returned %d.%d.%d, but the minimum version\n", $arts_major_version, $arts_minor_version, $arts_micro_version);
      printf("*** of ARTS required is %d.%d.%d. If artsc-config is correct, then it is\n", major, minor, micro);
      printf("*** best to upgrade to the required version.\n");
      printf("*** If artsc-config was wrong, set the environment variable ARTS_CONFIG\n");
      printf("*** to point to the correct copy of artsc-config, and remove the file\n");
      printf("*** config.cache before re-running configure\n");
      return 1;
    }
}

],, no_arts=yes,
         AC_TRY_LINK([
#include <stdio.h>
#include <artsc.h>
],       [ return 0; ],, no_arts=yes))
       CFLAGS="$ac_save_CFLAGS"
       LIBS="$ac_save_LIBS"
     fi
  fi
  if test "x$no_arts" = x ; then
     AC_MSG_RESULT(yes)
     ifelse([$2], , :, [$2])     
  else
     AC_MSG_RESULT(no)
     if test "$ARTS_CONFIG" = "no" ; then
       echo "*** The artsc-config script installed by ARTS could not be found"
       echo "*** If ARTS was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the ARTS_CONFIG environment variable to the"
       echo "*** full path to artsc-config."
     else
       if test -f conf.artstest ; then
        :
       else
          echo "*** Could not run ARTS test program, checking why..."
          CFLAGS="$CFLAGS $ARTS_CFLAGS"
          LIBS="$LIBS $ARTS_LIBS"
          AC_TRY_LINK([
#include <stdio.h>
#include <artsc.h>
],      [ return 0; ],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding ARTS or finding the wrong"
          echo "*** version of ARTS. If it is not finding ARTS, you'll need to set your"
          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
          echo "*** is required on your system"
	  echo "***"
          echo "*** If you have an old version installed, it is best to remove it, although"
          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means ARTS was incorrectly installed"
          echo "*** or that you have moved ARTS since it was installed. In the latter case, you"
          echo "*** may want to edit the artsc-config script: $ARTS_CONFIG" ])
          CFLAGS="$ac_save_CFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi
     ARTS_CFLAGS=""
     ARTS_LIBS=""
     ifelse([$3], , :, [$3])
  fi
  AC_SUBST(ARTS_CFLAGS)
  AC_SUBST(ARTS_LIBS)
  rm -f conf.artstest
  AC_LANG_RESTORE
])