#! /bin/bash
# 
# (C) 2006 by Argonne National Laboratory.
#     See COPYRIGHT in top-level directory.
#
# mpicxx
# Simple script to compile and/or link MPI programs.
# This script knows the default flags and libraries, and can handle
# alternative C++ compilers and the associated flags and libraries.
# The important terms are:
#    includedir, libdir - Directories containing an *installed* mpich2
#    prefix, execprefix - Often used to define includedir and libdir
#    CXX                - C compiler
#    WRAPPER_CXXFLAGS      - Any special flags needed to compile 
#    WRAPPER_LDFLAGS       - Any special flags needed to link
#    MPILIBNAME         - Name of the MPI library
#    MPICXXLIBNAME      - Name of the C++ binding part of the MPI library
#    MPI_OTHERLIBS      - Other libraries needed in order to link 
#    
# We assume that (a) the C++ compiler can both compile and link programs
#
# Handling of command-line options:
#   This is a little tricky because some options may contain blanks.
#
# Special issues with shared libraries - todo
#
# --------------------------------------------------------------------------
# Set the default values of all variables.
#
# Directory locations: Fixed for any MPI implementation
prefix=/net/course/csu685/.www/roomy/mpich2-install
exec_prefix=${prefix}
sysconfdir=${prefix}/etc
includedir=${prefix}/include
libdir=${exec_prefix}/lib
#
# Default settings for compiler, flags, and libraries
CXX="c++"
CXX_LINKPATH_SHL=""
WRAPPER_CXXFLAGS=""
WRAPPER_LDFLAGS="  "
MPILIBNAME="mpich"
PMPILIBNAME="pmpich"
MPICXXLIBNAME="mpichcxx"
MPI_OTHERLIBS="-lpthread      -lrt   "
NEEDSPLIB="no"
# MPIVERSION is the version of the MPICH2 library that mpicxx is intended for
MPIVERSION="1.0.8"
#
# Internal variables
# Show is set to echo to cause the compilation command to be echoed instead 
# of executed.
Show=
#
# End of initialization of variables
#---------------------------------------------------------------------
# Environment Variables.
# The environment variables MPICH_CXX may be used to override the 
# default choices.
# In addition, if there is a file $sysconfdir/mpicxx-$CXXname.conf, 
# where CXXname is the name of the compiler with all spaces replaced by hyphens
# (e.g., "CC -64" becomes "CC--64", that file is sources, allowing other
# changes to the compilation environment.  See the variables used by the 
# script (defined above)
if [ -n "$MPICH_CXX" ] ; then
    CXX="$MPICH_CXX"
    CXXname=`echo $CXX | sed 's/ /-/g'`
    if [ -s $sysconfdir/mpicxx-$CXXname.conf ] ; then
        . $sysconfdir/mpicxx-$CXXname.conf
    fi
fi
# Allow a profiling option to be selected through an environment variable
if [ -n "$MPICXX_PROFILE" ] ; then
    profConf=$MPICXX_PROFILE
fi
#
# ------------------------------------------------------------------------
# Argument processing.
# This is somewhat awkward because of the handling of arguments within
# the shell.  We want to handle arguments that include spaces without 
# loosing the spacing (an alternative would be to use a more powerful
# scripting language that would allow us to retain the array of values, 
# which the basic (rather than enhanced) Bourne shell does not.  
#
# Look through the arguments for arguments that indicate compile only.
# If these are *not* found, add the library options

linking=yes
allargs=("$@")
argno=0
for arg in "$@" ; do
    # Set addarg to no if this arg should be ignored by the C compiler
    addarg=yes
    case "$arg" in 
 	# ----------------------------------------------------------------
	# Compiler options that affect whether we are linking or no
    -c|-S|-E|-M|-MM)
    # The compiler links by default
    linking=no
    ;;
	# ----------------------------------------------------------------
	# Options that control how we use mpicxx (e.g., -show, 
	# -cxx=* -config=*
    -echo)
    addarg=no
    set -x
    ;;
    -cxx=*)
    CXX=`echo A$arg | sed -e 's/A-cxx=//g'`
    addarg=no
    ;;
    # Backwards compatibility for MPICH1 - scripts
    -CC=*)
    CXX=`echo A$arg | sed -e 's/A-CC=//g'`
    addarg=no
    ;;
    -show)
    addarg=no
    Show=echo
    ;;
    -config=*)
    addarg=no
    CXXname=`echo A$arg | sed -e 's/A-config=//g'`
    if [ -s "$sysconfdir/mpicxx-$CXXname.conf" ] ; then
        . "$sysconfdir/mpicxx-$CXXname.conf"
    else
	echo "Configuration file mpicxx-$CXXname.conf not found"
    fi
    ;;
    -compile-info|-compile_info)
    # -compile_info included for backward compatibility
    Show=echo
    addarg=no
    ;;
    -link-info|-link_info)
    # -link_info included for backward compatibility
    Show=echo
    addarg=no
    ;;
    -v)
    # Pass this argument to the compiler as well.
    echo "mpicxx for $MPIVERSION"
    # if there is only 1 argument, it must be -v.
    if [ "$#" -eq "1" ] ; then
        linking=no
    fi
    ;;
    -profile=*)
    # Pass the name of a profiling configuration.  As
    # a special case, lib<name>.so or lib<name>.la may be used
    # if the library is in $libdir
    profConf=`echo A$arg | sed -e 's/A-profile=//g'`
    addarg=no
    # Loading the profConf file is handled below
    ;;
    -mpe=*)
    # Pass the name of a profiling configuration; this is a special
    # case for the MPE libs.  See -profile
    profConf=`echo A$arg | sed -e 's/A-mpe=//g'`
    profConf="mpe_$profConf"
    addarg=no
    # Loading the profConf file is handled below
    ;;
    -help)
    NC=`echo "$CXX" | sed 's%\/% %g' | awk '{print $NF}' -`
    if [ -f "$sysconfdir/mpixxx_opts.conf" ] ; then
        . $sysconfdir/mpixxx_opts.conf
        echo "    -cxx=xxx      - Reset the native compiler to xxx."
    else
        if [ -f "./mpixxx_opts.conf" ] ; then
            . ./mpixxx_opts.conf
            echo "    -cxx=xxx      - Reset the native compiler to xxx."
        fi
    fi
    exit 0
    ;;
    *)
    ;;

    esac
    if [ $addarg = no ] ; then
	unset allargs[$argno]
    fi
    # Some versions of bash do not accept ((argno++))
    argno=`expr $argno + 1`
done

if [ $# -eq 0 ] ; then
    echo "Error: Command line argument is needed!"
    "$0" -help
    exit 1
fi

# -----------------------------------------------------------------------
# Derived variables.  These are assembled from variables set from the
# default, environment, configuration file (if any) and command-line
# options (if any)
if [ "$NEEDSPLIB" = yes ] ; then
    mpilibs="-l$PMPILIBNAME -l$MPILIBNAME"
else
    mpilibs="-l$MPILIBNAME"
fi
cxxlibs=
if [ "$MPICXXLIBNAME" != "$MPILIBNAME" ] ; then
    cxxlibs="-l$MPICXXLIBNAME"
fi
#
# Init with the ones needed by MPI
CXXFLAGS="$WRAPPER_CXXFLAGS"
LDFLAGS="$WRAPPER_LDFLAGS"
#
#
# Handle the case of a profile switch
if [ -n "$profConf" ] ; then
    profConffile=
    if [ -s "$libdir/lib$profConf.a" -o -s "$libdir/lib$profConf.so" ] ; then
	mpilibs="-l$profConf $mpilibs"
    elif [ -s "$sysconfdir/$profConf.conf" ] ; then
	profConffile="$sysconfdir/$profConf.conf"
    elif [ -s "$profConf.conf" ] ; then
        profConffile="$profConf.conf"
    else
        echo "Profiling configuration file $profConf.conf not found in $sysconfdir"
    fi
    if [ -n "$profConffile" -a -s "$profConffile" ] ; then
	. $profConffile
	if [ -n "$PROFILE_INCPATHS" ] ; then
	    CXXFLAGS="$PROFILE_INCPATHS $CXXFLAGS"
        fi
        if [ -n "$PROFILE_PRELIB" ] ; then
	    mpilibs="$PROFILE_PRELIB $mpilibs"
        fi
        if [ -n "$PROFILE_POSTLIB" ] ; then
	    mpilibs="$mpilibs $PROFILE_POSTLIB"
        fi
    fi
fi
# A temporary statement to invoke the compiler
# Place the -L before any args incase there are any mpi libraries in there.
# Eventually, we'll want to move this after any non-MPI implementation 
# libraries
if [ "$linking" = yes ] ; then
    if [ -n "$CXX_LINKPATH_SHL" ] ; then
        # Prepend the path for the shared libraries to the library list
        shllibpath="$CXX_LINKPATH_SHL$libdir"
    fi
    $Show $CXX $CXXFLAGS $LDFLAGS "${allargs[@]}" -I$includedir -L$libdir $shllibpath $cxxlibs $mpilibs $MPI_OTHERLIBS
    rc=$?
else
    $Show $CXX $CXXFLAGS "${allargs[@]}" -I$includedir
    rc=$?
fi

exit $rc