#!/bin/ksh
#
# Script for running the C/C++ compiler when building python modules
#

#
#
# Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#

MYNAME=`basename $0`

# name of the compiler executable
CCEXE='cc'
# name of the GNU compiler executable
GCCEXE='gcc'
# name of the programming language
CLANG='C'
# name of the env variable for setting the compiler path
CVAR='CC'

if [ "x$PYCC_CC" != x ]; then
    CC="$PYCC_CC"
fi

if [ "x$MYNAME" = xpyCC ]; then
    CCEXE='CC'
    GCCEXE='g++'
    CLANG='C++'
    CC="$CXX"
    CVAR='CXX'
    if [ "x$PYCC_CXX" != x ]; then
        CC="$PYCC_CXX"
    fi
fi

SAVED_IFS="$IFS"
IFS=:

# check if the CC env variable is set
if [ "x$CC" != x ]; then
    # verify that it doesn't point to this script
    if /usr/bin/cmp -s "$CC" $0; then
        echo "WARNING: "$CVAR" is set to this script; ignoring this value to avoid an infinite loop"
	CC=
    fi
fi

# check again if the CC env variable is set
if [ "x$CC" != x ]; then
    case "$CC" in
	/* )
	    # $CC is an absolute path name
            # check if $CC exists
	    if [ ! -e "$CC" ]; then
		echo "WARNING: pycc: $CC not found" 1>&2
		CC=
	    else
        # check if $CC is an executable
		if [ ! -x "$CC" -o ! -f "$CC" ]; then
		    echo "WARNING: pycc: $CC is not an executable" 1>&2
		    CC=
		fi
	    fi
	    ;;
	* )
	    # try to find $CC in the PATH
	    NEW_CC=
	    for dir in $PATH; do
		if [ -x "$dir/$CC" ]; then
		    NEW_CC="$dir/$CC"
		    break
		fi
	    done
	    if [ "x$NEW_CC" = x ]; then
		echo "WARNING: pycc: $CC not found" 1>&2
		CC=
	    else
		CC="$NEW_CC"
	    fi
	    ;;
    esac
fi

if [ "x$CC" = x ]; then
    # Look for the Sun Studio compiler in the PATH
    for dir in $PATH; do
	if [ -x "$dir/$CCEXE" ]; then
	    CC="$dir/$CCEXE"
	    break
	fi
    done
fi

if [ "x$CC" = x ]; then
    # Look for gcc in the PATH
    for dir in $PATH; do
	if [ -x "$dir/$GCCEXE" ]; then
	    CC="$dir/$GCCEXE"
	    break
	fi
    done
fi

if [ "x$CC" = x ]; then
    # Check for Sun Studio in /opt/SUNWspro (default install location)
    if [ -x /opt/SUNWspro/bin/$CCEXE ]; then
	CC=/opt/SUNWspro/bin/$CCEXE
    fi
fi

if [ "x$CC" = x ]; then
    # Check for the GNU compiler in /usr/sfw/bin
    if [ -x /usr/sfw/bin/$GCCEXE ]; then
	CC=/usr/sfw/bin/$GCCEXE
    fi
fi

if [ "x$CC" = x ]; then
    # Cannot continue without a C compiler
    echo "ERROR: no $CLANG compiler not found; update your PATH or set the $CVAR env variable" 1>&2
    exit 1
fi

IFS="$SAVED_IFS"

# We need to make some modifications to adapt correctly to compiler options
# that differ between GCC and Studio.

extra_flags=

is_gcc=no

$CC --version >/dev/null 2>&1 && is_gcc=yes

if [ "$is_gcc" = yes ]; then
	for flag in "${@}"; do
		# need -shared to link shared objects properly
		if [ "$flag" = "-G" ]; then
			extra_flags="$extra_flags -shared"
		fi
	done
	# force PIC compilation
	extra_flags="$extra_flags -fPIC -DPIC"
else
	extra_flags="$extra_flags -KPIC"
fi

exec "$CC" $extra_flags "${@}"