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ACX_MPI([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
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/)
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/$F77, but is more often something like mpicc/mpiCC/mpif77.) It also sets MPILIBS to any libraries that are needed for linking MPI (e.g. -lmpi, if a special MPICC/MPICXX/MPIF77 was not found).
If you want to compile everything with MPI, you should set:
CC="$MPICC" #OR# CXX="$MPICXX" #OR# F77="$MPIF77" LIBS="$MPILIBS $LIBS"
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.)
The user can force a particular library/compiler by setting the MPICC/MPICXX/MPIF77 and/or MPILIBS environment variables.
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.
Steven G. Johnson <stevenj@alum.mit.edu>
2005-09-02
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
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