$Id: README,v 1.2 2010/05/18 06:00:18 kmura Exp $
==========================================================================
Geant4 MPI Interface

  Author:
  Koichi Murakami (KEK) / Koichi.Murakami@kek.jp
==========================================================================

How to build
============

1. Check "G4MPI.gmk" for yor MPI configuration:

* Set "G4MPIROOT", which is the root path to your MPI library.
* Redifine CXX as (wrapped) MPI C++ compiler.
* Specify additional include paths and compiler flags to "CPPFLAGS".

Sample makefiles for (OpnMPI, LAM, MPICH2) are also presented.
An example of "G4MPI.gmk":

# ===========================================================
#  Makefile for building G4MPI (OpenMPI)
# ===========================================================

ifndef G4MPIROOT
  G4MPIROOT = /opt/ompi
endif

# additional flags
CXX := mpic++
CXXFLAGS := $(subst -Wall, , $(CXXFLAGS))
CPPFLAGS += -I$(G4MPIROOT)/include -I$(G4MPIROOT)/include/openmpi


2. Build the library

# make
# make includes

The library (libG4UImpi) will be created in $G4LIB, 
and header files will be installed into $G4INCLUDE.