AC_INIT(ESPResSo, [2.9.0], address@hidden)

AC_ARG_WITH(mpi,,, [with_mpi=guess])
AS_IF([test x"$with_mpi" = xno], [use_mpi_fake="yes"], [
  # if MPI is wanted, look for MPI compiler
  AC_PROG_CC([mpicc hcc mpxlc_r mpxlc mpcc cmpicc])
  # test whether MPI_Init is available now
  AC_CHECK_FUNC(MPI_Init,,, [
    # if not, give up or use fake
    if test xyes = x"$with_mpi"; then
      AC_MSG_FAILURE([MPI compiler requested, but couldn't compile with MPI.])
    else
      AC_MSG_WARN([No MPI compiler found, will use fake implementation!])
      use_mpi_fake="yes"
    fi
  ])
])

AS_IF([test x"$use_mpi_fake" = xyes], [
  # use the fake implementation and the standard compiler
  AC_PROG_CC
  ESPRESSO_MPIEXEC=""
])
# if requested, use the fake implementation
#AM_CONDITIONAL(MPI_FAKE, [test x$use_mpi_fake = xyes])