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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 The macro has to be used instead of the standard macro AC_PROG_CC and will replace the standard variable CC 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])
  AX_PROG_CC_MPI([test x"$with_mpi" != xno],[use_mpi=yes],[
    if test x"$with_mpi" = xyes; then
      AC_MSG_FAILURE([MPI compiler requested, but couldn't use MPI.])
      AC_MSG_WARN([No MPI compiler found, won't use MPI.])

Source Code

Download the latest version of ax_prog_cc_mpi.m4 or browse the macro’s revision history.


Copyright © 2010,2011 Olaf Lenz

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