ScalES-PPM

m4_if(m4_version_compare(m4_PACKAGE_VERSION,[2.69]),[-1],

# AC_FC_MODULE_OUTPUT_FLAG([ACTION-IF-SUCCESS], [ACTION-IF-FAILURE = FAILURE])

# ----------------------------------------------------------------------------

# Find a flag to write Fortran 90 module information to another directory.

# If successful, run ACTION-IF-SUCCESS (defaults to nothing), otherwise

# run ACTION-IF-FAILURE (defaults to failing with an error message).

# The module flag is cached in the ac_cv_fc_module_output_flag variable.

# It may contain significant trailing whitespace.

#

# For known flags, see the documentation of AC_FC_MODULE_FLAG above.

AC_DEFUN([AC_FC_MODULE_OUTPUT_FLAG],[

AC_CACHE_CHECK([Fortran 90 module output flag], [ac_cv_fc_module_output_flag],

[AC_LANG_PUSH([Fortran])

mkdir conftest.dir conftest.dir/sub

cd conftest.dir

ac_cv_fc_module_output_flag=unknown

ac_fc_module_output_flag_FCFLAGS_save=$FCFLAGS

# Flag ordering is significant: put flags late which some compilers use

# for the search path.

for ac_flag in -J '-J ' -fmod= -moddir= +moddir= -qmoddir= '-mod ' \

	      '-module ' -M '-Am -M' '-e m -J '; do

  FCFLAGS="$ac_fc_module_output_flag_FCFLAGS_save ${ac_flag}sub"

  AC_COMPILE_IFELSE([[

      module conftest_module

      contains

      subroutine conftest_routine

      write(*,'(a)') 'gotcha!'

      end subroutine

      end module]],

    [cd sub

     AC_COMPILE_IFELSE([[

      program main

      use conftest_module

      call conftest_routine

      end program]],

       [ac_cv_fc_module_output_flag="$ac_flag"])

     cd ..

     if test "$ac_cv_fc_module_output_flag" != unknown; then

       break

     fi])

done

FCFLAGS=$ac_fc_module_output_flag_FCFLAGS_save

cd ..

rm -rf conftest.dir

AC_LANG_POP([Fortran])

])

if test "$ac_cv_fc_module_output_flag" != unknown; then

  FC_MODOUT=$ac_cv_fc_module_output_flag

  $1

else

  FC_MODOUT=

  m4_default([$2],

    [AC_MSG_ERROR([unable to find compiler flag to write module information to])])

fi

AC_SUBST([FC_MODOUT])

# Ensure trailing whitespace is preserved in a Makefile.

AC_SUBST([ac_empty], [""])

AC_CONFIG_COMMANDS_PRE([case $FC_MODOUT in #(

  *\ ) FC_MODOUT=$FC_MODOUT'${ac_empty}' ;;

esac])dnl

])