Find Fortran 90 modules inclusion flag.

2006-01-28

Luc Maisonobe <luc@spaceroots.org> Julian C. Cummings <cummings@cacr.caltech.edu>

AllPermissive
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. Users of this software should generally follow the principles of the MIT License includings its disclaimer.

cryp.to ac-archive's Fortran Support (released)

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.

AC_DEFUN([AX_F90_MODULE_FLAG],[
AC_CACHE_CHECK([fortran 90 modules inclusion flag],
ax_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_$i
AC_COMPILE_IFELSE([module conftest_module
   contains
   subroutine conftest_routine
   write(*,'(a)') 'gotcha!'
   end subroutine conftest_routine
   end module conftest_module
  ],[],[])
cd ..
ax_f90_modflag="not found"
for ax_flag in "-I " "-M" "-p"; do
  if test "$ax_f90_modflag" = "not found" ; then
    ax_save_FCFLAGS="$FCFLAGS"
    FCFLAGS="$ax_save_FCFLAGS ${ax_flag}tmpdir_$i"
    AC_COMPILE_IFELSE([program conftest_program
       use conftest_module
       call conftest_routine
       end program conftest_program
      ],[ax_f90_modflag="$ax_flag"],[])
    FCFLAGS="$ax_save_FCFLAGS"
  fi
done
rm -fr tmpdir_$i
if test "$ax_flag" = "not found" ; then
  AC_MSG_ERROR([unable to find compiler flag for modules inclusion])
fi
AC_LANG_POP(Fortran)
])])