#! /bin/sh
#
# Script to compile and link MPI programs
# We'd like to just add a few libraries to the link line and an include
# directory to the compile line, but some systems that MPICH supports make
# that difficult because the compiler and the linker are different programs.
# Thus, this code tries to figure out which options go where, at least for
# things that are different between compile and link steps.
#
# New Organization:
# To better support a range of compilers and library formats, the compilation
# scripts can now read a configuration file describing the compiler (defaults
# are provided in the script for the default case, i.e., same as MPICH was 
# built with.  This file is mpicc-<compilername>.conf.  For example, a
# typical installation might have mpicc-cc.conf and mpicc-gcc.conf, for the 
# vendor compiler and gcc, respectively.  These are selected by either setting
# the environment variable CC, or using the -config name switch.
#
# 
#
DoLink=1
DoCompile=0
show_compile=0
show_link=0
MPILOG=
Show=eval
allargs=
compileargs=
linkargs=
linkobjs=
gettinglinkarg=0
HasDashC=0
UsesPmpi=0
verbose=0
#
# Directory locations: Fixed for any MPI implementation
prefix=@prefix@
exec_prefix=@exec_prefix@
sysconfdir=@sysconfdir@
includedir=@includebuild_dir@
libdir=@libbuild_dir@
#
#
# Default compiler configuration.  A configuration file may override any
# of these (including the location of the MPI library), but must do so
# consistently with the MPICH library chosen.  By including the library
# and include paths here, we can use the same mpicc for a range of 
# libraries and compilers, including ones for 32 and 64 bit systems.
CCBASE="@CC@"
CLINKERBASE="@CLINKER@"
USER_CFLAGS="@USER_CFLAGS@"
ROMIO_TCFLAGS="@ROMIO_TCFLAGS@"
ROMIO_LFLAGS="@ROMIO_LFLAGS@"
BASE_LIB_LIST="@BASE_LIB_LIST@"
LIB_PATH="@LIB_PATH@"
MPILIBNAME="@MPILIBNAME@"
MPIVERSION="@MPIVERSION@"
FLIBNAME="@FLIBNAME@"
hasMPE=@hasMPE@
#
MPI_WITH_PMPI="@MPI_WITH_PMPI@"
proflib=-lp${MPILIBNAME}
proflibfullname=${libdir}/libp${MPILIBNAME}.a
# Shared library support
SHAREDKIND="@SHAREDKIND@"
SHARED_LIB_SEARCH_PATH_LEADER='@SHARED_LIB_SEARCH_PATH_LEADER@'
SHARED_LIB_LOCALDIR="@SHARED_LIB_LOCALDIR@"
sharedlibdir=@sharedlibbuild_dir@
#
# Override the compilers using environment variables
CLINKER="${MPICH_CLINKER-$CLINKERBASE}"
if [ -n "$MPICH_CC" ] ; then
    CC="$MPICH_CC"
    CCname=`echo $CC | sed 's/ /-/g'`
    if [ -s $sysconfdir/mpicc-$CCname.conf ] ; then
        . $sysconfdir/mpicc-$CCname.conf
    fi
else
    CC="$CCBASE"
fi
UseSharedLib=${MPICH_USE_SHLIB-no}
#
for arg in "$@" ; do
#    echo procssing arg $arg
    # Special processing for -o name
    if [ $gettinglinkarg = 1 ] ; then
	linkargs="$linkargs $arg"
	outputfilename="$arg"
	gettinglinkarg=0
	continue
    fi
    case "$arg" in 
	-c)
	# If -c is NOT specified, then we need to perform a link step.
	allargs="$allargs $arg"
	compileargs="$compileargs $arg"
        # If -o was set, then we need to move the output file option
        # to the compile line (note that this is non-standard, and should
        # not be used in portable codes)
        if [ $DoLink = 1 -a -n "$outputfilename" ] ; then
	    compileargs="$compileargs -o $outputfilename"
        fi
	DoLink=0
	HasDashC=1
	;;
        -o)
	# Need to link
	allargs="$allargs $arg"
        if [ $HasDashC = 1 ] ; then
            # Some BUT NOT ALL compilers support -o with -c.  Allow
            # the user to make use of the feature, IF IT EXISTS.
            compileargs="$compileargs $arg"	
        else
	    linkargs="$linkargs $arg"
	    # Still need to add the target of the -o
	    gettinglinkarg=1
	    DoLink=1
        fi
	;;
	-E|-M)
	# For compilers that support -E as a way to get at the C preprocessor
	# Also, for compilers that support -M for creating dependencies
	allargs="$allargs $arg"
	compileargs="$compileargs $arg"
	HasDashC=1
	DoLink=0
	;;

	-mpilog)
	if [ $UsesPmpi = 1 ] ; then
	    echo "Only one of -mpilog, -mpitrace, or -mpianim may be used."
	    exit 1
	else
	    UsesPmpi=1
        fi
	if [ $hasMPE = "yes" ] ; then
		MPILOG="-llmpe -lmpe"
	else
	    echo "-mpilog requires the MPE libraries"
	fi
	;;
	-mpitrace)
	if [ $UsesPmpi = 1 ] ; then
	    echo "Only one of -mpilog, -mpitrace, or -mpianim may be used."
	    exit 1
	else
	    UsesPmpi=1
        fi
	if [ $hasMPE = "yes" ] ; then
   	    MPILOG=-ltmpe
	else
	    echo "-mpitrace requires the MPE libraries"
	fi
	;;
	-mpianim)
	if [ $UsesPmpi = 1 ] ; then
	    echo "Only one of -mpilog, -mpitrace, or -mpianim may be used."
	    exit 1
	else
	    UsesPmpi=1
        fi
	if [ $hasMPE = "yes" ] ; then
	    MPILOG="-lampe -lmpe"
	else
	    echo "-mpianim requires the MPE libraries"
	fi
	;;
	-echo)
	set -x
	;;
	-show)
	Show=echo
	;;
	-config=*)
	CCname=`echo A$arg | sed -e 's/A-config=//g'`
        if [ -s $sysconfdir/mpicc-$CCname.conf ] ; then
	    . $sysconfdir/mpicc-$CCname.conf 
	else
	    echo "Configuration file mpicc-$CCname.conf not found"
	fi
	;;
	-cc=*)
	CC=`echo A$arg | sed -e 's/A-cc=//g'`
	CLINKER="$CC"
	;;
	-compile_info)
	show_compile=1
	DoLink=0
	Show=echo
	;;
	-link_info)
	show_link=1
	Show=echo
	;;
	-shlib)
        UseSharedLib=yes
	;;
	-noshlib)
        UseSharedLib=no
	;;
	-v)
	verbose=1
	compileargs="$compileargs -v"
	linkargs="$linkargs -v"
	;;
	-l*)
	# This SHOULD be the -l<lib> argument.  Only for the linker
	linkargs="$linkargs $arg"
	allargs="$allargs $arg"
	;;
	-help)
	echo "This is a program to compile or link MPI programs"
	echo "In addition, the following special options are supported"
	echo "    -mpilog    - Build version that generate MPE log files"
	echo "    -mpitrace  - Build version that generates traces"
	echo "    -mpianim   - Build version that generates real-time"
	echo "                 animation"
	echo "    -cc=pgm    - Change the program to use to compile and link"
        echo "                 MPI programs.  WARNING! The program that you"
        echo "                 choose MUST be compatible with the MPICH "
        echo "                 libraries.  If you have trouble, you should"
        echo "                 reconfigure and rebuild MPICH, selecting"
        echo "                 this compiler."
	echo "    -show      - Show the commands that would be used without"
	echo "                 runnning them"
	echo "    -compile_info - Show how to compile a program"
	echo "    -link_info - Show how to link a program"
	echo "    -help      - Give this help"
	echo "    -echo      - Show exactly what this program is doing."
	echo "                 This option should normally not be used."
	echo "This should be used just like the usual C compiler"
	echo "For example,"
	echo "   $0 -c foo.c "
	echo "and"
	echo "   $0 -o foo foo.o"
	echo "Combining compilation and linking in a single command"
	echo "   $0 -o foo foo.c"
	echo "may not work on some systems, and is not recommended."
	exit 1
	;;
	
	# Unrecognized args.  Because we do an eval, we need to
	# carefully quote any args that contain quotes.
        *\"*) 
	qarg="'"$arg"'"
	allargs="$allargs $qarg"
	compileargs="$compileargs $qarg"
	linkargs="$linkargs $qarg"
	;;
        *\'*) 
	qarg='\"'"$arg"'\"'
	allargs="$allargs $qarg"
	compileargs="$compileargs $qarg"
	linkargs="$linkargs $qarg"
	;;
        *) allargs="$allargs $arg"
	if [ -s "$arg" ] ; then
	    ext=`expr "$arg" : '.*\(\..*\)'`
	    if [ "$ext" = ".c" ] ; then
	        DoCompile=1
	        compileargs="$compileargs $arg"
	        fname=`basename $arg .c`
	        linkobjs="$linkobjs $fname.o"
	    elif [ "$ext" = ".o" ] ; then
		if [ $HasDashC = 1 ] ; then
	            compileargs="$compileargs $arg"
                else
	            DoLink=1
	            linkobjs="$linkobjs $arg"
                fi
	    else
	        compileargs="$compileargs $arg"
	        linkargs="$linkargs $arg"
	    fi
	else
            compileargs="$compileargs $arg"
	    linkargs="$linkargs $arg"
	fi
	;;
    esac
done
#
status=0
if [ $DoCompile = 1 -o $show_compile = 1 ] ; then 
    if [ $HasDashC != 1 ] ; then
        compileargs="-c $compileargs"
    fi
    $Show $CC $USER_CFLAGS $ROMIO_TCFLAGS -I$includedir $compileargs
    status=$?
    if [ $status != 0 ] ; then 
	exit $status
    fi
fi
#
# Here's a tricky issue:  If there is no mpi library yet, we can't link,
# but if we are building other tools that need mpicc, they may need to 
# build and run non-mpi programs.  This is currently handled in the configure
# by making a dummy library.
# 
if [ $DoLink = 1 -o $show_link = 1 ] ; then
    # Figure out the library list.  Because we want to support both a single
    # mpi library containing both C and Fortran interfaces, as well as 
    # a library that allows multiple Fortran interfaces, we may need different
    # library link lines.  With a unified C/Fortran library, we just
    # use -l${MPILIBNAME}.  With separate Fortran libraries, we need
    # -l<fortranwrapperlib> -l${MPILIBNAME} -l<fortransuplib>
    # We also handle the profiling library here, which may not be needed
    # for those systems that support weak symbols.
    if [ "${MPILIBNAME}" = "${FLIBNAME}" -o -z "${FLIBNAME}" ] ; then
        mpilibs="-l${MPILIBNAME}"
    else
        mpilibs="-l${FLIBNAME} -l${MPILIBNAME} -l${FLIBNAME}fsup"
    fi
    # If the profiling library doesn't exist, or MPICH_NO_PROF environment
    # variable is set, skip the profiling library.
    if [ -n "$MPICH_NO_PROF" -o ! -s "$proflibfullname" ] ; then
        proflib=""
    fi
    # IRIX complains if we include a library twice.  In the case of a
    # library using weak symbols, we don't need the proflib.  Just
    # in case we do, there is an enviroment variable that
    # can be used to override this test.
    if [ "${MPI_WITH_PMPI}" = "yes" -a "$MPICH_INCLUDE_PROFLIB" != yes ] ; then
        proflib=""
    fi
    # If proflib is non-empty, then add it
    if [ -n "$proflib" ] ; then
        mpilibs="$proflib $mpilibs $proflib"
    fi
    # Only use the shared libraries if explicitly requested.  This is
    # necessary because some (all?) systems are quite happy to link with
    # a shared library *and then forget where it is*!  You often need to
    # set an environment variable like LD_LIBRARY_PATH to include the
    # path where the shared libraries are (is this broken or what?).
    # Since that enviroment variable would then need to be set for all
    # hosts where the program might run (since rsh doesn't propagate 
    # the environment), we don't make this the default.
    if [ "${SHAREDKIND}" != "ignore" -a $UseSharedLib = "yes" ] ; then
	clibpath="-L${sharedlibdir}"
        if [ -n "${SHARED_LIB_SEARCH_PATH_LEADER}" ] ; then
	    clibpath="${SHARED_LIB_SEARCH_PATH_LEADER}${sharedlibdir} $clibpath"
  	    fi
	if [ -n "${SHAREDLIB_LOCALDIR}" ] ; then
	    clibpath="-L${SHAREDLIB_LOCALDIR} $clibpath"
 	    if [ -n "${SHARED_LIB_SEARCH_PATH_LEADER}" ] ; then
	        clibpath="${SHARED_LIB_SEARCH_PATH_LEADER}${SHAREDLIB_LOCALDIR} $clibpath"
  	    fi
	fi
    fi
    # TEMP HACK: ${MPILIBNAME}fsup is the Fortran support library (initfutil.o)
    # It contains routines called by MPI_Init, and external symbols
    # used in some of the C/Fortran routines.  For Fortran subroutines,
    # we need to add the Fortran routines in a separate library 
    # ahead of the C implementation.
    $Show $CLINKER $USER_CFLAGS $ROMIO_LFLAGS $clibpath $LIB_PATH $linkobjs $MPILOG $linkargs $mpilibs $BASE_LIB_LIST
    status=$?
fi
exit $status
