1# ===========================================================================
2#      http://www.gnu.org/software/autoconf-archive/ax_prog_cc_mpi.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_PROG_CC_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 C programs that use MPI
12#   (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_CC and will replace the
15#   standard variable CC 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 C 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 C 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_CC_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 1
76
77AC_DEFUN([AX_PROG_CC_MPI], [
78AC_PREREQ(2.50)
79AC_BEFORE([$0],[AC_PROG_CC_C99])
80AC_BEFORE([$0],[AC_PROG_CC])
81
82# Check for compiler
83# Needs to be split off into an extra macro to ensure right expansion
84# order.
85AC_REQUIRE([_AX_PROG_CC_MPI],[_AX_PROG_CC_MPI([$1])])
86dnl echo "--2- CC ---> $CC"
87AS_IF([test x"$_ax_prog_cc_mpi_mpi_wanted" = xno],
88  [ _ax_prog_cc_mpi_mpi_found=no ],
89  [
90    AC_LANG_PUSH([C])
91    # test whether MPI_Init is available
92    # We do not use AC_SEARCH_LIBS here, as it caches its outcome and
93    # thus disallows corresponding calls in the other AX_PROG_*_MPI
94    # macros.
95    for lib in NONE mpi mpich; do
96      save_LIBS=$LIBS
97      if test x"$lib" = xNONE; then
98        AC_MSG_CHECKING([for function MPI_Init])
99      else
100        AC_MSG_CHECKING([for function MPI_Init in -l$lib])
101        LIBS="-l$lib $LIBS"
102      fi
103      AC_LINK_IFELSE([AC_LANG_CALL([],[MPI_Init])],
104        [ _ax_prog_cc_mpi_mpi_found=yes ],
105        [ _ax_prog_cc_mpi_mpi_found=no ])
106      AC_MSG_RESULT($_ax_prog_cc_mpi_mpi_found)
107      if test "x$_ax_prog_cc_mpi_mpi_found" = "xyes"; then
108        break;
109      fi
110      LIBS=$save_LIBS
111    done
112
113    # Check for header
114    AS_IF([test x"$_ax_prog_cc_mpi_mpi_found" = xyes], [
115      AC_MSG_CHECKING([for mpi.h])
116      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <mpi.h>])],
117        [ AC_MSG_RESULT(yes)],
118        [ AC_MSG_RESULT(no)
119         _ax_prog_cc_mpi_mpi_found=no
120      ])
121    ])
122    AC_LANG_POP([C])
123])
124
125# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
126AS_IF([test x"$_ax_prog_cc_mpi_mpi_found" = xyes], [
127        ifelse([$2],,[AC_DEFINE(HAVE_MPI,1,[Define if you have the MPI library.])],[$2])
128        :
129],[
130        $3
131        :
132])
133
134])dnl AX_PROG_CC_MPI
135
136dnl _AX_PROG_CC_MPI is an internal macro required by AX_PROG_CC_MPI.
137dnl To ensure the right expansion order, the main function AX_PROG_CC_MPI
138dnl has to be split into two parts.
139dnl
140dnl Known MPI C compilers:
141dnl  mpicc
142dnl  mpixlc_r
143dnl  mpixlc
144dnl  hcc
145dnl  mpxlc_r
146dnl  mpxlc
147dnl  sxmpicc  NEC SX
148dnl  mpifcc   Fujitsu
149dnl  mpgcc
150dnl  mpcc
151dnl  cmpicc
152dnl  cc
153dnl
154AC_DEFUN([__AX_PROG_CC_MPI], [
155AC_BEFORE([$0],[AC_PROG_CC_C99])
156AC_BEFORE([$0],[AC_PROG_CC])
157
158  AC_ARG_VAR(MPICC,[MPI C compiler command])
159  ifelse([$1],,[_ax_prog_cc_mpi_mpi_wanted=yes],[
160    AC_MSG_CHECKING([whether to compile C using MPI])
161    if $1; then
162      _ax_prog_cc_mpi_mpi_wanted=yes
163    else
164      _ax_prog_cc_mpi_mpi_wanted=no
165    fi
166    AC_MSG_RESULT($_ax_prog_cc_mpi_mpi_wanted)
167  ])
168  if test x"$_ax_prog_cc_mpi_mpi_wanted" = xyes; then
169    if test -z "$CC" && test -n "$MPICC"; then
170      CC="$MPICC"
171    elif test -z "$CC"; then
172dnl       echo "------------------CC 1 -----------------------"
173dnl       echo "--- CC ---> $CC"
174      AC_CHECK_TOOLS([CC], [mpicc mpixlc_r mpixlc hcc mpxlc_r mpxlc sxmpicc mpifcc mpgcc mpcc cmpicc cc gcc])
175dnl       echo "--- CC ---> $CC"
176dnl       echo "------------------CC 2 -----------------------"
177    fi
178  fi
179dnl  AC_PROG_CC
180])dnl _AX_PROG_CC_MPI
181
182AC_DEFUN([_AX_PROG_CC_MPI], [
183  AC_REQUIRE([__AX_PROG_CC_MPI],[__AX_PROG_CC_MPI([$1])])
184dnl   echo "---------3-----------------------"
185  AC_PROG_CC_C99
186dnl   echo "---------4-----------------------"
187])
188