1# ===========================================================================
2#      http://www.gnu.org/software/autoconf-archive/ax_prog_f77_mpi.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_PROG_F77_MPI([MPI-WANTED-TEST[, ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]])
8#
9# DESCRIPTION
10#
11#   This macro tries to find out how to compile Fortran77 programs that use
12#   MPI (Message Passing Interface), a standard API for parallel process
13#   communication (see http://www-unix.mcs.anl.gov/mpi/).  The macro has to
14#   be used instead of the standard macro AC_PROG_F77 and will replace the
15#   standard variable F77 with the found compiler.
16#
17#   MPI-WANTED-TEST is used to test whether MPI is actually wanted by the
18#   user. If MPI-WANTED_TEST is omitted or if it succeeds, the macro will
19#   try to find out how to use MPI, if it fails, the macro will call
20#   AC_PROG_CC to find a standard C compiler instead.
21#
22#   When MPI is found, ACTION-IF-FOUND will be executed, if MPI is not found
23#   (or MPI-WANTED-TEST fails) ACTION-IF-NOT-FOUND is executed. If
24#   ACTION-IF-FOUND is not set, the macro will define HAVE_MPI.
25#
26#   The following example demonstrates usage of the macro:
27#
28#     # If --with-mpi=auto is used, try to find MPI, but use standard F77 compiler if it is not found.
29#     # If --with-mpi=yes is used, try to find MPI and fail if it isn't found.
30#     # If --with-mpi=no is used, use a standard F77 compiler instead.
31#     AC_ARG_WITH(mpi, [AS_HELP_STRING([--with-mpi],
32#         [compile with MPI (parallelization) support. If none is found,
33#         MPI is not used. Default: auto])
34#     ],,[with_mpi=auto])
35#
36#     AX_PROG_F77_MPI([test x"$with_mpi" != xno],[use_mpi=yes],[
37#       use_mpi=no
38#       if test x"$with_mpi" = xyes; then
39#         AC_MSG_FAILURE([MPI compiler requested, but couldn't use MPI.])
40#       else
41#         AC_MSG_WARN([No MPI compiler found, won't use MPI.])
42#       fi
43#     ])
44#
45# LICENSE
46#
47#   Copyright (c) 2010,2011 Olaf Lenz <olenz@icp.uni-stuttgart.de>
48#
49#   This program is free software: you can redistribute it and/or modify it
50#   under the terms of the GNU General Public License as published by the
51#   Free Software Foundation, either version 3 of the License, or (at your
52#   option) any later version.
53#
54#   This program is distributed in the hope that it will be useful, but
55#   WITHOUT ANY WARRANTY; without even the implied warranty of
56#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
57#   Public License for more details.
58#
59#   You should have received a copy of the GNU General Public License along
60#   with this program. If not, see <http://www.gnu.org/licenses/>.
61#
62#   As a special exception, the respective Autoconf Macro's copyright owner
63#   gives unlimited permission to copy, distribute and modify the configure
64#   scripts that are the output of Autoconf when processing the Macro. You
65#   need not follow the terms of the GNU General Public License when using
66#   or distributing such scripts, even though portions of the text of the
67#   Macro appear in them. The GNU General Public License (GPL) does govern
68#   all other use of the material that constitutes the Autoconf Macro.
69#
70#   This special exception to the GPL applies to versions of the Autoconf
71#   Macro released by the Autoconf Archive. When you make and distribute a
72#   modified version of the Autoconf Macro, you may extend this special
73#   exception to the GPL to apply to your modified version as well.
74
75#serial 2
76
77AC_DEFUN([AX_PROG_F77_MPI], [
78AC_PREREQ(2.50)
79
80# Check for compiler
81# Needs to be split off into an extra macro to ensure right expansion
82# order.
83AC_REQUIRE([_AX_PROG_F77_MPI],[_AX_PROG_F77_MPI([$1])])
84
85AS_IF([test x"$_ax_prog_f77_mpi_mpi_wanted" = xno],
86  [ _ax_prog_f77_mpi_mpi_found=no ],
87  [
88    AC_LANG_PUSH([Fortran 77])
89
90    # test whether MPI_INIT is available
91    # We do not use AC_SEARCH_LIBS here, as it caches its outcome and
92    # thus disallows corresponding calls in the other AX_PROG_*_MPI
93    # macros.
94    for lib in NONE fmpi fmpich; do
95      save_LIBS=$LIBS
96      if test x"$lib" = xNONE; then
97        AC_MSG_CHECKING([for function MPI_INIT])
98      else
99        AC_MSG_CHECKING([for function MPI_INIT in -l$lib])
100        LIBS="-l$lib $LIBS"
101      fi
102      AC_LINK_IFELSE([AC_LANG_CALL([],[MPI_INIT])],
103        [ _ax_prog_f77_mpi_mpi_found=yes ],
104        [ _ax_prog_f77_mpi_mpi_found=no ])
105      AC_MSG_RESULT($_ax_prog_f77_mpi_mpi_found)
106      if test "x$_ax_prog_f77_mpi_mpi_found" = "xyes"; then
107        break;
108      fi
109      LIBS=$save_LIBS
110    done
111
112    # Check for header
113    AS_IF([test x"$_ax_prog_f77_mpi_mpi_found" = xyes], [
114      AC_MSG_CHECKING([for mpif.h])
115      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[[
116      include 'mpif.h'
117]])],
118        [ AC_MSG_RESULT(yes)],
119        [ AC_MSG_RESULT(no)
120	  _ax_prog_f77_mpi_mpi_found=no
121      ])
122    ])
123    AC_LANG_POP([Fortran 77])
124])
125
126# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
127AS_IF([test x"$_ax_prog_f77_mpi_mpi_found" = xyes], [
128        ifelse([$2],,[AC_DEFINE(HAVE_MPI,1,[Define if you have the MPI library.])],[$2])
129        :
130],[
131        $3
132        :
133])
134
135])dnl AX_PROG_F77_MPI
136
137dnl _AX_PROG_F77_MPI is an internal macro required by AX_PROG_F77_MPI.
138dnl To ensure the right expansion order, the main function AX_PROG_F77_MPI
139dnl has to be split into two parts. This part looks for the MPI
140dnl compiler, while the other one tests whether an MPI program can be
141dnl compiled.
142dnl
143dnl Known Fortran 77 compilers:
144dnl  af77         Apogee F77 compiler for Intergraph hardware running CLIX
145dnl  blrts_xlf    IBM BlueGene/L F77 cross-compiler
146dnl  cf77         native F77 compiler under older Crays (prefer over fort77)
147dnl  f77          generic compiler names
148dnl  fl32         Microsoft Fortran 77 "PowerStation" compiler
149dnl  fort77       native F77 compiler under HP-UX (and some older Crays)
150dnl  frt          Fujitsu F77 compiler
151dnl  g77          GNU Fortran 77 compiler
152dnl  pgf77        Portland Group F77 compiler
153dnl  xlf          IBM (AIX) F77 compiler
154dnl  pathf77      PathScale
155dnl
156AC_DEFUN([_AX_PROG_F77_MPI], [
157  AC_ARG_VAR(MPIF77,[MPI Fortran77 compiler command])
158  ifelse([$1],,[_ax_prog_f77_mpi_mpi_wanted=yes],[
159    AC_MSG_CHECKING([whether to compile using MPI])
160    if $1; then
161      _ax_prog_f77_mpi_mpi_wanted=yes
162    else
163      _ax_prog_f77_mpi_mpi_wanted=no
164    fi
165    AC_MSG_RESULT($_ax_prog_f77_mpi_mpi_wanted)
166  ])
167  if test x"$_ax_prog_f77_mpi_mpi_wanted" = xyes; then
168    if test -z "$F77" && test -n "$MPIF77"; then
169      F77="$MPIF77"
170    else
171      AC_CHECK_TOOLS([F77], [mpif77 hf77 mpxlf_r mpxlf mpifrt mpf77 cmpifc xlf f77 frt pgf77 pathf77 g77 cf77 fort77 fl32 af77])
172    fi
173  fi
174  AC_PROG_F77
175])dnl _AX_PROG_F77_MPI
176