comparison src/fftw-3.3.3/m4/acx_mpi.m4 @ 95:89f5e221ed7b

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+dnl @synopsis ACX_MPI([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+dnl @summary figure out how to compile/link code with MPI
+dnl @category InstalledPackages
+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 NOTE: The above assumes that you will use $CC (or whatever)
+dnl       for linking as well as for compiling.  (This is the
+dnl       default for automake and most Makefiles.)
+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 2005-09-02
+dnl @license GPLWithACException
+dnl @author Steven G. Johnson <[e-mail]>
+
+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