#!/bin/sh
# This file is part of NIT ( http://www.nitlanguage.org ).
#
# Copyright 2008 Jean Privat <jean@pryen.org>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Separately recompile a bunch of c files then link them

OPTS="-g" # option for compiler call
objs="" # List of .o files
CC="gcc --ansi --pedantic -Wall -Wextra -Wformat-security -Wcast-align -Wno-uninitialized -Wno-unused-variable -Wno-unused-label -Wno-unused-parameter" # Default compiler call
ext="_savo _sav" # Default flavor to reuse
out="a.out"  # Default output binary filename
dir="" # Default tmp dir
nolibgc="false" # Try to use libgc ?
CKSUM="cksum" # Tool that perfors checksum. cksum seems to be very portable

usage()
{
	e=`basename "$0"`
	cat<<END
Usage: $e [options] modulename [options for module execution]
-O          Compile with optimizations
-i          Use the intel compiler instead of gcc
-I path     Add a include directory
-o name     Call name the executable
-d          Create temporary files in a specific directory
-nolibgc    Do not include libgc
-h          This help
END
}

test_libgc() {
cat > .tmp.c <<END
#include <stdlib.h>
#include <gc/gc.h>
int main(void) {
        void *r = GC_malloc(1);
	        return r == NULL;
	}
END
gcc .tmp.c -lgc -o .tmp.bin 2> /dev/null
res=$?
rm .tmp.c
if [ $res = 0 ]; then
	./.tmp.bin
	res=$?
	rm .tmp.bin
fi
return $res
}

stop=false
while [ $stop = false ]; do
	case $1 in 
		-O) OPTS="$OPTS -O2" ext="_savo"; shift;;
		-i) CC="/opt/intel/cc/10.1.015/bin/icc -O2" ext="_savi"; shift;;
		-I) OPTS="$OPTS -I $2"; shift; shift;;
		-o) out="$2"; shift; shift;;
		-d) dir="$2/"; shift; shift;;
		--nolibgc) nolibgc=true; shift;;
		-x) OPTS="$OPTS $2"; shift; shift;;
		-h|"") usage; exit;;
		*) stop=true
	esac
done

if [ $nolibgc != true ] && test_libgc; then
	OPTS="$OPTS -DWITH_LIBGC -lgc"
fi

for i in "$@"; do
	j=`basename "$i" .c`
	found="false"
	# We remove starting # to be path independent (after preprocess, there are the only # remainings)
	cksum=`gcc -E $OPTS $i 2> /dev/null | grep -v "^#" | $CKSUM`
	for e in $ext; do
		o="$dir$j.$e.o"
		cksumfile="$dir$j.$e.cksum"
		if [ -f "$cksumfile" -a -f "$o" ]; then
			cksumtry=`cat $cksumfile`
			if [ "x$cksum" = "x$cksumtry" ]; then
				found=true
				break
			fi
		fi
	done
	if [ $found = false ]; then
		echo "* $CC $OPTS -c $i -o $o" >&2
		if $CC $OPTS -c $i -o $o; then
			echo "$cksum" > "$cksumfile"
		else
			exit 1
		fi
	fi
	objs="$objs $o"
done

echo "* $CC $OPTS -lm $objs -o $out" >&2
$CC $OPTS -lm $objs -o "$out"