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openmpi/config/f90_find_module_include_flag.m4
Jeff Squyres 87fce5c2a6 Bunches of things with respect to F90, mainly resulting from work on
Monday with Craig:
- split two f90 modules into two separate .f90 files so that
  dependencies can be satisfied properly in parallel builds (i.e.,
  mpi_kinds.f90 can be compiled and its f90 module can be generated
  before any others are compiled, because it is needed by all of the
  other f90 source files).
- rename mpi.i.h* to be mpi-f90-interfaces.h, just to be a little more
  clear and less name-confusing with mpi.h and mpif.h
- update the build process in src/mpi/f90, including printing out a
  warning that compiling mpi.f90 may take quite a while :-\
- update the wrapper compilers to add in the Right Things for
  compiling F90 MPI applications
- add a check in configure to find what flag the F90 compiler uses to
  identify where f90 module files live

This commit was SVN r5297.
2005-04-13 11:54:36 +00:00

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dnl -*- shell-script -*-
dnl
dnl Copyright (c) 2004-2005 The Trustees of Indiana University.
dnl All rights reserved.
dnl Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
dnl All rights reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
dnl University of Stuttgart. All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
AC_DEFUN([OMPI_F90_FIND_MODULE_INCLUDE_FLAG],[
AC_MSG_CHECKING([for FORTRAN compiler module include flag])
possible_flags="-I -p -M"
mkdir conftest.$$
cd conftest.$$
#
# Try to compile an F90 module
#
mkdir subdir
cd subdir
cat > conftest-module.f90 <<EOF
module OMPI_MOD_FLAG
type OMPI_MOD_FLAG_TYPE
integer :: i
end type OMPI_MOD_FLAG_TYPE
end module OMPI_MOD_FLAG
EOF
OMPI_LOG_COMMAND([$FC $FCFLAGS $FCFLAGS_f90 -c conftest-module.f90], ,
AC_MSG_RESULT([Whoops!])
AC_MSG_WARN([*** Cannot seem to compile an f90 module])
AC_MSG_ERROR([Cannot continue]))
cd ..
#
# Now try to compile a simple program usinng that module, iterating
# through the possible flags that the compiler might use
#
cat > conftest.f90 <<EOF
program main
use OMPI_MOD_FLAG
end program main
EOF
OMPI_FC_MODULE_FLAG=
for flag in $possible_flags; do
if test "$OMPI_FC_MODULE_FLAG" = ""; then
OMPI_LOG_COMMAND([$FC $FCFLAGS $FCFLAGS_f90 conftest.f90 $flag subdir],
[OMPI_FC_MODULE_FLAG="$flag"])
fi
done
cd ..
rm -rf conftest.$$
#
# Did we find it?
#
if test "$OMPI_FC_MODULE_FLAG" = ""; then
AC_MSG_RESULT([])
AC_MSG_WARN([*** Could not determine the f90 compiler flag to indicate where modules reside])
AC_MSG_ERROR([Cannot continue])
fi
AC_MSG_RESULT([$OMPI_FC_MODULE_FLAG])
AC_SUBST(OMPI_FC_MODULE_FLAG)])dnl