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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_f90_module_flag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_F90_MODULE_FLAG
#
# DESCRIPTION
#
# Find Fortran 90 modules inclusion flag. The module inclusion flag is
# stored in the cached variable ax_f90_modflag. An error is triggered if
# the flag cannot be found. Supported are the -I GNU compilers flag, the
# -M SUN compilers flag, and the -p Absoft Pro Fortran compiler flag.
#
# LICENSE
#
# Copyright (c) 2009 Luc Maisonobe <luc@spaceroots.org>
# Copyright (c) 2009 Julian C. Cummings <cummings@cacr.caltech.edu>
# Copyright (c) 2009 Alexander Pletzer <pletzer@txcorp.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 14
AC_DEFUN([AX_F90_MODULE_FLAG],[
AC_CACHE_CHECK([fortran 90 modules inclusion flag],
ax_cv_f90_modflag,
[AC_LANG_PUSH(Fortran)
i=0
while test \( -f tmpdir_$i \) -o \( -d tmpdir_$i \) ; do
i=`expr $i + 1`
done
mkdir tmpdir_$i
cd tmpdir_$i
AC_COMPILE_IFELSE([
!234567
module conftest_module
contains
subroutine conftest_routine
write(*,'(a)') 'gotcha!'
end subroutine conftest_routine
end module conftest_module
],[],[])
cd ..
ax_cv_f90_modflag="not found"
for ax_flag in "-I " "-I" "-M" "-p"; do
if test "$ax_cv_f90_modflag" = "not found" ; then
ax_save_FCFLAGS="$FCFLAGS"
FCFLAGS="$ax_save_FCFLAGS ${ax_flag}tmpdir_$i"
AC_COMPILE_IFELSE([
!234567
program conftest_program
use conftest_module
call conftest_routine
end program conftest_program
],[ax_cv_f90_modflag="$ax_flag"],[])
FCFLAGS="$ax_save_FCFLAGS"
fi
done
rm -fr tmpdir_$i
if test "$ax_cv_f90_modflag" = "not found" ; then
AC_MSG_ERROR([unable to find compiler flag for modules inclusion])
fi
AC_LANG_POP(Fortran)
])])
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