dnl @synopsis ACX_MPI([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) dnl dnl This macro tries to find out how to compile programs that dnl use MPI (Message Passing Interface), a standard API for dnl parallel process communication (see http://www-unix.mcs.anl.gov/mpi/) dnl dnl On success, it sets the MPICC, MPICXX, or MPIF77 output variable to dnl the name of the MPI compiler, depending upon the current language. dnl (This may just be $CC/$CXX/$F77, but is more often something like dnl mpicc/mpiCC/mpif77.) It also sets MPILIBS to any libraries that are dnl needed for linking MPI (e.g. -lmpi, if a special MPICC/MPICXX/MPIF77 dnl was not found). dnl dnl If you want to compile everything with MPI, you should set: dnl dnl CC="$MPICC" #OR# CXX="$MPICXX" #OR# F77="$MPIF77" dnl LIBS="$MPILIBS $LIBS" dnl dnl The user can force a particular library/compiler by setting the dnl MPICC/MPICXX/MPIF77 and/or MPILIBS environment variables. dnl dnl ACTION-IF-FOUND is a list of shell commands to run if an MPI dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands dnl to run it if it is not found. If ACTION-IF-FOUND is not specified, dnl the default action will define HAVE_MPI. dnl dnl @version $Id: acx_mpi.m4,v 1.2 2002/10/24 05:11:22 stevenj Exp $ dnl @author Steven G. Johnson AC_DEFUN([ACX_MPI], [ AC_PREREQ(2.50) dnl for AC_LANG_CASE AC_LANG_CASE([C], [ AC_REQUIRE([AC_PROG_CC]) AC_CHECK_PROGS(MPICC, mpicc hcc mpcc mpcc_r mpxlc, $CC) acx_mpi_save_CC="$CC" CC="$MPICC" AC_SUBST(MPICC) ], [C++], [ AC_REQUIRE([AC_PROG_CXX]) AC_CHECK_PROGS(MPICXX, mpiCC mpCC, $CXX) acx_mpi_save_CXX="$CXX" CXX="$MPICXX" AC_SUBST(MPICXX) ], [Fortran 77], [ AC_REQUIRE([AC_PROG_F77]) AC_CHECK_PROGS(MPIF77, mpif77 hf77 mpxlf mpf77 mpif90 mpf90 mpxlf90 mpxlf95 mpxlf_r, $F77) acx_mpi_save_F77="$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 ],[],[AC_MSG_RESULT(yes)], [MPILIBS="" AC_MSG_RESULT(no)]) fi], [C++], [if test x != x"$MPILIBS"; then AC_MSG_CHECKING([for mpi.h]) AC_TRY_COMPILE([#include ],[],[AC_MSG_RESULT(yes)], [MPILIBS="" AC_MSG_RESULT(no)]) fi]) AC_LANG_CASE([C], [CC="$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