1# ===========================================================================
2#      http://www.gnu.org/software/autoconf-archive/ax_prog_cxx_mpi.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_PROG_CXX_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_CXX and will replace the
15#   standard variable CXX 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_CXX_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_CXX_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_CXX_MPI],[_AX_PROG_CXX_MPI([$1])])
84
85AS_IF([test x"$_ax_prog_cxx_mpi_mpi_wanted" = xno],
86  [ _ax_prog_cxx_mpi_mpi_found=no ],
87  [
88    AC_LANG_PUSH([C++])
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 mpi mpich; 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 $LIBS"
101      fi
102      AC_LINK_IFELSE([
103        AC_LANG_PROGRAM([
104extern "C" { void MPI_Init(); }
105],[MPI_Init();])],
106        [ _ax_prog_cxx_mpi_mpi_found=yes ],
107        [ _ax_prog_cxx_mpi_mpi_found=no ])
108      AC_MSG_RESULT($_ax_prog_cxx_mpi_mpi_found)
109      if test "x$_ax_prog_cxx_mpi_mpi_found" = "xyes"; then
110        break;
111      fi
112      LIBS=$save_LIBS
113    done
114
115    # Check for header
116    AS_IF([test x"$_ax_prog_cxx_mpi_mpi_found" = xyes], [
117      AC_MSG_CHECKING([for mpi.h])
118      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <mpi.h>])],
119        [ AC_MSG_RESULT(yes)],
120        [ AC_MSG_RESULT(no)
121         _ax_prog_cxx_mpi_mpi_found=no
122      ])
123    ])
124    AC_LANG_POP([C++])
125])
126
127# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
128AS_IF([test x"$_ax_prog_cxx_mpi_mpi_found" = xyes], [
129        ifelse([$2],,[AC_DEFINE(HAVE_MPI,1,[Define if you have the MPI library.])],[$2])
130        :
131],[
132        $3
133        :
134])
135
136])dnl AX_PROG_CXX_MPI
137
138dnl _AX_PROG_CXX_MPI is an internal macro required by AX_PROG_CXX_MPI.
139dnl To ensure the right expansion order, the main function AX_PROG_CXX_MPI
140dnl has to be split into two parts.
141dnl
142dnl Known MPI C++ compilers:
143dnl  mpic++
144dnl  mpicxx
145dnl  mpiCC
146dnl  sxmpic++     NEC SX
147dnl  hcp
148dnl  mpxlC_r
149dnl  mpxlC
150dnl  mpixlcxx_r
151dnl  mpixlcxx
152dnl  mpg++
153dnl  mpc++
154dnl  mpCC
155dnl  cmpic++
156dnl  mpiFCC       Fujitsu
157dnl  CC
158dnl
159AC_DEFUN([_AX_PROG_CXX_MPI], [
160  AC_ARG_VAR(MPICXX,[MPI C++ compiler command])
161  ifelse([$1],,[_ax_prog_cxx_mpi_mpi_wanted=yes],[
162    AC_MSG_CHECKING([whether to compile using MPI])
163    if $1; then
164      _ax_prog_cxx_mpi_mpi_wanted=yes
165    else
166      _ax_prog_cxx_mpi_mpi_wanted=no
167    fi
168    AC_MSG_RESULT($_ax_prog_cxx_mpi_mpi_wanted)
169  ])
170  if test x"$_ax_prog_cxx_mpi_mpi_wanted" = xyes; then
171    if test -z "$CXX" && test -n "$MPICXX"; then
172      CXX="$MPICXX"
173    else
174      AC_CHECK_TOOLS([CXX], [mpic++ mpicxx mpiCC sxmpic++ hcp mpxlC_r mpxlC mpixlcxx_r mpixlcxx mpg++ mpc++ mpCC cmpic++ mpiFCC CCicpc pgCC pathCC sxc++ xlC_r xlC bgxlC_r bgxlC openCC sunCC crayCC g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC])
175    fi
176  fi
177  AC_PROG_CXX
178])dnl _AX_PROG_CXX_MPI
179