#! /bin/bash
##
## Copyright (C) by Argonne National Laboratory
##     See COPYRIGHT in top-level directory
##

# 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* mpich
#    prefix, execprefix - Often used to define includedir and libdir
#    CC                 - C compiler
#    WRAPPER_CFLAGS        - Any special flags needed to compile 
#    WRAPPER_LDFLAGS       - Any special flags needed to link
#    WRAPPER_LIBS          - Any special 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.
# Set from the directory arguments to configure (e.g., --prefix=/usr/local)
prefix=/opt/local
exec_prefix=/opt/local
sysconfdir=/opt/local/etc/mpich-clang90
includedir=/opt/local/include/mpich-clang90
libdir=/opt/local/lib/mpich-clang90

# Default settings for compiler, flags, and libraries.
# Determined by a combination of environment variables and tests within
# configure (e.g., determining whether -lsocket is needee)
CC="/opt/local/bin/clang-mp-9.0"
MPICH_VERSION="4.1.2"


# How to pass a linker flag through the compiler.
wl="-Wl,"

# Static library suffix (normally "a").
libext="a"

# Shared library suffix (normally "so").
shlibext="dylib"

# Format of library name prefix.
libname_spec="lib\$name"

# Library names that the linker finds when passed -lNAME.
library_names_spec="\$libname\$shrext"

# Flag to hardcode $libdir into a binary during linking.
# This must work even if $libdir does not exist.
hardcode_libdir_flag_spec=""

# Flag to add dtags to allow using runpath instead of rpath
enable_dtags_flag=""
disable_dtags_flag=""

# Whether we need a single -rpath flag with a separated argument.
hardcode_libdir_separator=""

# Set to yes if using DIR/libNAME.so during linking hardcodes DIR into the
# resulting binary.
hardcode_direct="no"

# Set to yes if using the -LDIR flag during linking hardcodes DIR into the
# resulting binary.
hardcode_minus_L="no"


# Attempt to construct dynamic loading info, based on the user
# preference of rpath, runpath or none and on the detected libdir
# flags.
with_wrapper_dl_type=runpath
if test "X${with_wrapper_dl_type}" = "Xrunpath" ; then
    eval wrapper_dl_type_flags=\"${hardcode_libdir_flag_spec} ${enable_dtags_flag}\"
elif test "X${with_wrapper_dl_type}" = "Xrpath" ; then
    eval wrapper_dl_type_flags=\"${hardcode_libdir_flag_spec} ${disable_dtags_flag}\"
else
    wrapper_dl_type_flags=""
fi

# 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_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)
# Added MPICH_CC_OLD, MPICH_CC can be used to prefix CC with external utility,
# e.g. setenv MPICH_CC 'eval linkcache $MPICH_CC_OLD'
if [ -n "$MPICH_CC" ] ; then
    MPICH_CC_OLD="$CC"
    CC="$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 
# losing 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=("$@")
argno=0
interlib_deps=yes
static_mpi=no
showinfo=""
delay_libs=
for arg in "$@" ; do
    # Set addarg to no if this arg should be ignored by the C compiler
    addarg=yes
    case "$arg" in 
 	# ----------------------------------------------------------------
	# Compiler options that affect whether we are linking or no
    -c|-S|-E|-M|-MM)
    # The compiler links by default
    linking=no
    ;;
	# ----------------------------------------------------------------
	# Options that control how we use mpicc (e.g., -show, 
	# -cc=* -config=*
    -static)
    interlib_deps=no
    ;;
    -static-mpi)
    interlib_deps=no
    static_mpi=yes
    addarg=no
    ;;
    -echo)
    addarg=no
    set -x
    ;;
    -cc=*)
    CC=`echo A$arg | sed -e 's/A-cc=//g'`
    addarg=no
    ;;
    -show)
    addarg=no
    Show=echo
    ;;
    -show-compile-info)
    addarg=no
    Show=echo
    show_info=compile
    ;;
    -show-link-info)
    addarg=no
    Show=echo
    show_info=link
    ;;
    -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 MPICH version $MPICH_VERSION"
    # if there is only 1 argument, it must be -v.
    if [ "$#" -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
    ;;
    -nativelinking)
    # Internal option to use native compiler for linking without MPI libraries
    nativelinking=yes
    addarg=no
    ;;
    -lcuda|-lcudart)
    delay_libs="$delay_libs $arg"
    addarg=no
    ;;
    -help)
    NC=`echo "$CC" | sed 's%\/% %g' | awk '{print $NF}' -`
    if [ -f "$sysconfdir/mpixxx_opts.conf" ] ; then
        . $sysconfdir/mpixxx_opts.conf
        echo "    -cc=xxx       - Reset the native compiler to xxx."
    else
        if [ -f "./mpixxx_opts.conf" ] ; then
            . ./mpixxx_opts.conf
            echo "    -cc=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

# Check recursive situations
# User mistakes, e.g. setting MPICH_CC=mpicc, may end up recursively running
# this script. A simple check to bail if that's the case.
if [ -n "$MPICH_RECURSION_CHECK" ] ; then
    echo "This script ($0) is being called recursively, check that MPICH_CC does not refer to mpicc."
    exit 1
fi
MPICH_RECURSION_CHECK=1
export MPICH_RECURSION_CHECK

# -----------------------------------------------------------------------
# Derived variables.  These are assembled from variables set from the
# default, environment, configuration file (if any) and command-line
# options (if any)

PROFILE_FOO=
# Handle the case of a profile switch
if [ -n "$profConf" ] ; then
    profConffile=
    if [ -s "$libdir/lib$profConf.a" -o -s "$libdir/lib$profConf.so" ] ; then
	PROFILE_FOO="-l$profConf"
    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
    fi
fi

final_cflags=" "
final_cppflags=" "
final_ldflags=" -Wl,-commons,use_dylibs"
final_libs=""
if test "yes" = "no" -o "${interlib_deps}" = "no" ; then
    final_ldflags="${final_ldflags}"
    final_libs="${final_libs}  -L/opt/local/lib -lhwloc -lpthread -lMacportsLegacySupport"
fi

# -----------------------------------------------------------------------
#
# A temporary statement to invoke the compiler
# Place the -L before any args in case 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 [ "$show_info" = compile ] ; then
    echo ${final_cppflags} $PROFILE_INCPATHS ${final_cflags} -I$includedir
elif [ "$show_info" = link ] ; then
    if [ "$nativelinking" = yes ] ; then
        echo ${final_ldflags}
    else
        if [ "$static_mpi" = no ] ; then
            echo ${final_ldflags} -L$libdir $PROFILE_PRELIB $PROFILE_FOO ${wrapper_dl_type_flags} -lmpi -lpmpi $PROFILE_POSTLIB ${delay_libs} ${final_libs}
        else
            echo ${final_ldflags} -L$libdir $PROFILE_PRELIB $PROFILE_FOO ${wrapper_dl_type_flags} $libdir/libmpi.a -lpmpi $PROFILE_POSTLIB ${delay_libs} ${final_libs}
        fi
    fi
elif [ "$linking" = yes ] ; then
    if [ "$nativelinking" = yes ] ; then
        $Show $CC ${final_cppflags} $PROFILE_INCPATHS ${final_cflags} ${final_ldflags} "${allargs[@]}" -I$includedir
        rc=$?
    else
        if [ "$static_mpi" = no ] ; then
          $Show $CC ${final_cppflags} $PROFILE_INCPATHS ${final_cflags} ${final_ldflags} "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO ${wrapper_dl_type_flags} -lmpi -lpmpi $PROFILE_POSTLIB ${delay_libs} ${final_libs}
        else
          $Show $CC ${final_cppflags} $PROFILE_INCPATHS ${final_cflags} ${final_ldflags} "${allargs[@]}" -I$includedir -L$libdir $PROFILE_PRELIB $PROFILE_FOO ${wrapper_dl_type_flags} $libdir/libmpi.a -lpmpi $PROFILE_POSTLIB ${delay_libs} ${final_libs}
        fi
        rc=$?
    fi
else
    $Show $CC ${final_cppflags} $PROFILE_INCPATHS ${final_cflags} "${allargs[@]}" -I$includedir
    rc=$?
fi

exit $rc
