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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>
Autoconf Macro: acx_mpi
</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">
<a href="http://autoconf-archive.cryp.to/acx_mpi.m4">Download M4
Source</a>
</td>
<td style="width:50%;" align="center">
<a href="macros-by-category.html">Macro Index Page</a>
</td>
</tr>
</tbody>
</table>
<hr>
<h1>
acx_mpi
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>ACX_MPI([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This macro tries to find out how to compile programs that use MPI (Message
Passing Interface), a standard API for parallel process communication (see
http://www-unix.mcs.anl.gov/mpi/)
</p>
<p>
On success, it sets the MPICC, MPICXX, or MPIF77 output variable to the
name of the MPI compiler, depending upon the current language. (This may
just be $CC/$CXX/$F77, but is more often something like
mpicc/mpiCC/mpif77.) It also sets MPILIBS to any libraries that are needed
for linking MPI (e.g. -lmpi, if a special MPICC/MPICXX/MPIF77 was not
found).
</p>
<p>
If you want to compile everything with MPI, you should set:
</p>
<pre>
CC="$MPICC" #OR# CXX="$MPICXX" #OR# F77="$MPIF77"
LIBS="$MPILIBS $LIBS"
</pre>
<p>
NOTE: The above assumes that you will use $CC (or whatever) for linking as
well as for compiling. (This is the default for automake and most
Makefiles.)
</p>
<p>
The user can force a particular library/compiler by setting the
MPICC/MPICXX/MPIF77 and/or MPILIBS environment variables.
</p>
<p>
ACTION-IF-FOUND is a list of shell commands to run if an MPI library is
found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it is not
found. If ACTION-IF-FOUND is not specified, the default action will define
HAVE_MPI.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Steven G. Johnson <stevenj@alum.mit.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-09-02
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([ACX_MPI], [
AC_PREREQ(2.50) dnl for AC_LANG_CASE
AC_LANG_CASE([C], [
AC_REQUIRE([AC_PROG_CC])
AC_ARG_VAR(MPICC,[MPI C compiler command])
AC_CHECK_PROGS(MPICC, mpicc hcc mpcc mpcc_r mpxlc cmpicc, $CC)
acx_mpi_save_CC="$CC"
CC="$MPICC"
AC_SUBST(MPICC)
],
[C++], [
AC_REQUIRE([AC_PROG_CXX])
AC_ARG_VAR(MPICXX,[MPI C++ compiler command])
AC_CHECK_PROGS(MPICXX, mpic++ mpiCC mpicxx mpCC hcp mpxlC mpxlC_r cmpic++, $CXX)
acx_mpi_save_CXX="$CXX"
CXX="$MPICXX"
AC_SUBST(MPICXX)
],
[Fortran 77], [
AC_REQUIRE([AC_PROG_F77])
AC_ARG_VAR(MPIF77,[MPI Fortran compiler command])
AC_CHECK_PROGS(MPIF77, mpif77 hf77 mpxlf mpf77 mpif90 mpf90 mpxlf90 mpxlf95 mpxlf_r cmpifc cmpif90c, $F77)
acx_mpi_save_F77="$F77"
F77="$MPIF77"
AC_SUBST(MPIF77)
])
if test x = x"$MPILIBS"; then
AC_LANG_CASE([C], [AC_CHECK_FUNC(MPI_Init, [MPILIBS=" "])],
[C++], [AC_CHECK_FUNC(MPI_Init, [MPILIBS=" "])],
[Fortran 77], [AC_MSG_CHECKING([for MPI_Init])
AC_TRY_LINK([],[ call MPI_Init], [MPILIBS=" "
AC_MSG_RESULT(yes)], [AC_MSG_RESULT(no)])])
fi
if test x = x"$MPILIBS"; then
AC_CHECK_LIB(mpi, MPI_Init, [MPILIBS="-lmpi"])
fi
if test x = x"$MPILIBS"; then
AC_CHECK_LIB(mpich, MPI_Init, [MPILIBS="-lmpich"])
fi
dnl We have to use AC_TRY_COMPILE and not AC_CHECK_HEADER because the
dnl latter uses $CPP, not $CC (which may be mpicc).
AC_LANG_CASE([C], [if test x != x"$MPILIBS"; then
AC_MSG_CHECKING([for mpi.h])
AC_TRY_COMPILE([#include <mpi.h>],[],[AC_MSG_RESULT(yes)], [MPILIBS=""
AC_MSG_RESULT(no)])
fi],
[C++], [if test x != x"$MPILIBS"; then
AC_MSG_CHECKING([for mpi.h])
AC_TRY_COMPILE([#include <mpi.h>],[],[AC_MSG_RESULT(yes)], [MPILIBS=""
AC_MSG_RESULT(no)])
fi])
AC_LANG_CASE([C], [CC="$acx_mpi_save_CC"],
[C++], [CXX="$acx_mpi_save_CXX"],
[Fortran 77], [F77="$acx_mpi_save_F77"])
AC_SUBST(MPILIBS)
# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x = x"$MPILIBS"; then
$2
:
else
ifelse([$1],,[AC_DEFINE(HAVE_MPI,1,[Define if you have the MPI library.])],[$1])
:
fi
])dnl ACX_MPI
</pre>
</div>
</body>
</html>
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