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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_prog_cxx_mpi.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_CXX_MPI([MPI-WANTED-TEST[, ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]])
#
# DESCRIPTION
#
# This macro tries to find out how to compile C++ programs that use MPI
# (Message Passing Interface), a standard API for parallel process
# communication (see http://www-unix.mcs.anl.gov/mpi/). The macro has to
# be used instead of the standard macro AC_PROG_CXX and will replace the
# standard variable CXX with the found compiler.
#
# MPI-WANTED-TEST is used to test whether MPI is actually wanted by the
# user. If MPI-WANTED_TEST is omitted or if it succeeds, the macro will
# try to find out how to use MPI, if it fails, the macro will call
# AC_PROG_CC to find a standard C compiler instead.
#
# When MPI is found, ACTION-IF-FOUND will be executed, if MPI is not found
# (or MPI-WANTED-TEST fails) ACTION-IF-NOT-FOUND is executed. If
# ACTION-IF-FOUND is not set, the macro will define HAVE_MPI.
#
# The following example demonstrates usage of the macro:
#
# # If --with-mpi=auto is used, try to find MPI, but use standard C compiler if it is not found.
# # If --with-mpi=yes is used, try to find MPI and fail if it isn't found.
# # If --with-mpi=no is used, use a standard C compiler instead.
# AC_ARG_WITH(mpi, [AS_HELP_STRING([--with-mpi],
# [compile with MPI (parallelization) support. If none is found,
# MPI is not used. Default: auto])
# ],,[with_mpi=auto])
#
# AX_PROG_CXX_MPI([test x"$with_mpi" != xno],[use_mpi=yes],[
# use_mpi=no
# if test x"$with_mpi" = xyes; then
# AC_MSG_FAILURE([MPI compiler requested, but couldn't use MPI.])
# else
# AC_MSG_WARN([No MPI compiler found, won't use MPI.])
# fi
# ])
#
# LICENSE
#
# Copyright (c) 2010,2011 Olaf Lenz <olenz@icp.uni-stuttgart.de>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 2
AC_DEFUN([AX_PROG_CXX_MPI], [
AC_PREREQ(2.50)
# Check for compiler
# Needs to be split off into an extra macro to ensure right expansion
# order.
AC_REQUIRE([_AX_PROG_CXX_MPI],[_AX_PROG_CXX_MPI([$1])])
AS_IF([test x"$_ax_prog_cxx_mpi_mpi_wanted" = xno],
[ _ax_prog_cxx_mpi_mpi_found=no ],
[
AC_LANG_PUSH([C++])
# test whether MPI_Init() is available
# We do not use AC_SEARCH_LIBS here, as it caches its outcome and
# thus disallows corresponding calls in the other AX_PROG_*_MPI
# macros.
for lib in NONE mpi mpich; do
save_LIBS=$LIBS
if test x"$lib" = xNONE; then
AC_MSG_CHECKING([for function MPI_Init])
else
AC_MSG_CHECKING([for function MPI_Init in -l$lib])
LIBS="-l$lib $LIBS"
fi
AC_LINK_IFELSE([
AC_LANG_PROGRAM([
extern "C" { void MPI_Init(); }
],[MPI_Init();])],
[ _ax_prog_cxx_mpi_mpi_found=yes ],
[ _ax_prog_cxx_mpi_mpi_found=no ])
AC_MSG_RESULT($_ax_prog_cxx_mpi_mpi_found)
if test "x$_ax_prog_cxx_mpi_mpi_found" = "xyes"; then
break;
fi
LIBS=$save_LIBS
done
# Check for header
AS_IF([test x"$_ax_prog_cxx_mpi_mpi_found" = xyes], [
AC_MSG_CHECKING([for mpi.h])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <mpi.h>])],
[ AC_MSG_RESULT(yes)],
[ AC_MSG_RESULT(no)
_ax_prog_cxx_mpi_mpi_found=no
])
])
AC_LANG_POP([C++])
])
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
AS_IF([test x"$_ax_prog_cxx_mpi_mpi_found" = xyes], [
ifelse([$2],,[AC_DEFINE(HAVE_MPI,1,[Define if you have the MPI library.])],[$2])
:
],[
$3
:
])
])dnl AX_PROG_CXX_MPI
dnl _AX_PROG_CXX_MPI is an internal macro required by AX_PROG_CXX_MPI.
dnl To ensure the right expansion order, the main function AX_PROG_CXX_MPI
dnl has to be split into two parts.
dnl
dnl Known MPI C++ compilers:
dnl mpic++
dnl mpicxx
dnl mpiCC
dnl sxmpic++ NEC SX
dnl hcp
dnl mpxlC_r
dnl mpxlC
dnl mpixlcxx_r
dnl mpixlcxx
dnl mpg++
dnl mpc++
dnl mpCC
dnl cmpic++
dnl mpiFCC Fujitsu
dnl CC
dnl
AC_DEFUN([_AX_PROG_CXX_MPI], [
AC_ARG_VAR(MPICXX,[MPI C++ compiler command])
ifelse([$1],,[_ax_prog_cxx_mpi_mpi_wanted=yes],[
AC_MSG_CHECKING([whether to compile using MPI])
if $1; then
_ax_prog_cxx_mpi_mpi_wanted=yes
else
_ax_prog_cxx_mpi_mpi_wanted=no
fi
AC_MSG_RESULT($_ax_prog_cxx_mpi_mpi_wanted)
])
if test x"$_ax_prog_cxx_mpi_mpi_wanted" = xyes; then
if test -z "$CXX" && test -n "$MPICXX"; then
CXX="$MPICXX"
else
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])
fi
fi
AC_PROG_CXX
])dnl _AX_PROG_CXX_MPI
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