#! /bin/sh
# 
# (C) 2006 by Argonne National Laboratory.
#     See COPYRIGHT in top-level directory.
#
# mpicc
# 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
#    CC                 - C compiler
#    MPI_CFLAGS         - Any special flags needed to compile 
#    MPI_LDFLAGS        - Any special flags needed to link
#    MPILIBNAME         - Name 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
# We use MPI_xxx so that the user may continue to use CFLAGS, LIBS, etc
# to modify the behavior of the compiler and linker.
#
# 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.
# Set from the directory arguments to configure (e.g., --prefix=/usr/local)
prefix=@prefix@
exec_prefix=@exec_prefix@
sysconfdir=@sysconfdir@
includedir=@includedir@
libdir=@libdir@
#
# Default settings for compiler, flags, and libraries.
# Determined by a combination of environment variables and tests within
# configure (e.g., determining whehter -lsocket is needee)
CC="@CC@"
C_LINKPATH_SHL="@C_LINKPATH_SHL@"
MPI_CFLAGS="@MPI_CFLAGS@"
MPI_LDFLAGS="@MPI_LDFLAGS@"
MPILIBNAME="@MPILIBNAME@"
PMPILIBNAME="@PMPILIBNAME@"
MPI_OTHERLIBS="@LIBS@"
NEEDSPLIB="@NEEDSPLIB@"
# MPIVERSION is the version of the MPICH2 library that mpicc is intended for
MPIVERSION="@VERSION@"
#
# Internal variables
# Show is set to echo to cause the compilation command to be echoed instead 
# of executed.
Show=eval
#
# End of initialization of variables
#---------------------------------------------------------------------
# Environment Variables.
# The environment variables MPICH_CC may be used to override the 
# default choices.
# In addition, if there is a file $sysconfdir/mpicc-$CCname.conf, 
# where CCname 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 "$MPICH_CC" ] ; then
    CC="$MPICH_CC"
    CCname=`echo $CC | sed 's/ /-/g'`
    if [ -s $sysconfdir/mpicc-$CCname.conf ] ; then
        . $sysconfdir/mpicc-$CCname.conf
    fi
fi
# Allow a profiling option to be selected through an environment variable
if [ -n "$MPICC_PROFILE" ] ; then
    profConf=$MPICC_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=""
for arg in "$@" ; do
    # Set addarg to no if this arg should be ignored by the C compiler
    addarg=yes
    qarg=$arg
    case $arg in 
 	# ----------------------------------------------------------------
	# Compiler options that affect whether we are linking or no
    -c|-S|-E|-M|-MM)
    # The compiler links by default
    linking=no
    ;;
	# ----------------------------------------------------------------
	# Options that control how we use mpicc (e.g., -show, 
	# -cc=* -config=*
    -echo)
    addarg=no
    set -x
    ;;
    -cc=*)
    CC=`echo A$arg | sed -e 's/A-cc=//g'`
    addarg=no
    ;;
    -show)
    addarg=no
    Show=echo
    ;;
    -config=*)
    addarg=no
    CCname=`echo A$arg | sed -e 's/A-config=//g'`
    if [ -s "$sysconfdir/mpicc-$CCname.conf" ] ; then
        . "$sysconfdir/mpicc-$CCname.conf"
    else
	echo "Configuration file mpicc-$CCname.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 "mpicc for $MPIVERSION"
    ;;
    -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
    -help)
    ;;
        # -----------------------------------------------------------------
	# Other arguments.  We are careful to handle arguments with 
	# quotes (we try to quote all arguments in case they include 
	# any spaces)
    *\"*) 
    qarg="'"$arg"'"
    ;;
    *\'*) 
    qarg='\"'"$arg"'\"'
    ;;
    *)
    qarg="'$arg'"
    ;;

    esac
    if [ $addarg = yes ] ; then
        allargs="$allargs $qarg"
    fi
done

# -----------------------------------------------------------------------
# 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
#
# Concatenate the user flags with the ones needed by MPI
CFLAGS="$CFLAGS $MPI_CFLAGS"
LDFLAGS="$LDFLAGS $MPI_LDFLAGS"
#
# Handle the case of a profile switch
if [ -n "$profConf" ] ; then
    if [ -s "$libdir/lib$profConf.a" -o -s "$libdir/lib$profConf.so" ] ; then
	mpilibs="-l$profConf $mpilibs"
    elif [ -s "$sysconfdir/$profConf.conf" ] ; then
	. $sysconfdir/$profConf.conf
	if [ -n "$PROFILE_INCPATHS" ] ; then
	    CFLAGS="$PROFILE_INCPATHS $CFLAGS"
        fi
        if [ -n "$PROFILE_PRELIB" ] ; then
	    mpilibs="$PROFILE_PRELIB $mpilibs"
        fi
        if [ -n "$PROFILE_POSTLIB" ] ; then
	    mpilibs="$mpilibs $PROFILE_POSTLIB"
        fi
    else
        echo "Profiling configuration file $profConf.conf not found in $sysconfdir"
    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.
# We use a single invocation of the compiler.  This will be adequate until
# we run into a system that uses a separate linking command.  With any luck,
# such archaic systems are no longer with us.  This also lets us
# accept any argument; we don't need to know if we've seen a source
# file or an object file.  Instead, we just check for an option that
# suppressing linking, such as -c or -M.
if [ "$linking" = yes ] ; then
    if [ -n "$C_LINKPATH_SHL" ] ; then
	# prepend the path for the shared libraries to the library list
	mpilibs="$C_LINKPATH_SHL$libdir $mpilibs"
    fi
    $Show $CC $CFLAGS $LDFLAGS $allargs -I$includedir -L$libdir $mpilibs $MPI_OTHERLIBS
    rc=$?
else
    $Show $CC $CFLAGS $allargs -I$includedir
    rc=$?
fi

exit $rc
