AX_PROG_F77_MPI([MPI-WANTED-TEST[, ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]])
This macro tries to find out how to compile Fortran77 programs that use MPI (Message Passing Interface), a standard API for parallel process communication (see http://www-unix.mcs.anl.gov/mpi/). The macro has to be used instead of the standard macro AC_PROG_F77 and will replace the standard variable F77 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 F77 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 F77 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]) ],,[with_mpi=auto])
AX_PROG_F77_MPI([test x"$with_mpi" != xno],[use_mpi=yes],[ use_mpi=no if test x"$with_mpi" = xyes; then AC_MSG_FAILURE([MPI compiler requested, but couldn't use MPI.]) else AC_MSG_WARN([No MPI compiler found, won't use MPI.]) fi ])
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