configure

#!/bin/sh

EXIT_SUCCESS=0
EXIT_FAILURE=1

for option; do
	case "$option" in
	*=?*)
		value=`expr -- "$option" : '[^=]*=\(.*\)'`
		;;
	*=)
		value=
		;;
	*)
		value=yes
		;;
	esac

	case "$option" in
	--help)
		echo "Usage: $0 [OPTIONS]"
		echo
		echo "Options:"
		echo "  --ck-path=X			Use concurrencykit's include files from X."
		echo "  --fetch-ck			Fetch concurrencykit as a submodule."
		echo
		echo "The following environment variables may be used:"
		echo "   CC       C compiler command"
		exit $EXIT_SUCCESS
		;;
	--ck-path=*)
		CK_PATH="$value"
		;;
	--fetch-ck)
		CK_SUBMODULE=1
		;;
	--*)
		if test "$OPTION_CHECKING" -eq 1; then
			echo "$0 [--help]"
			echo "Unknown option $option"
			exit $EXIT_FAILURE
		fi
		;;
	*=*)
		NAME=`expr -- "$option" : '\([^=]*\)='`
		eval "$NAME='$value'"
		export $NAME
		;;
	*)
		echo "$0 [--help]"
		echo "Unknown option $option"
		exit $EXIT_FAILURE
		;;
	esac
done

do_cc() {
    local compiler="$1"
    shift
    echo "$CC $compiler $@"
    "$CC" $compiler "$@" || return $?
    return 0
}

assert()
{

	if test "$#" -eq 2; then
		fail=$2
		print=true
	elif test "$#" -eq 3; then
		fail=$3
		print=echo
	else
		echo "Usage: assert <test> <fail string> or assert <test> <success string> <fail string>" 1>&2
		exit $EXIT_FAILURE
	fi

	if test -z "$1"; then
		echo "failed  [$fail]"
		exit $EXIT_FAILURE
	else
		${print} "success [$1]"
	fi
}

CC=`which "${CC:-cc}"`
if test -z "$CC" -o ! -x "$CC"; then
	CC=`which "${CC:-gcc}"`
fi
assert "$CC" "not found"

GIT=`which git`
assert "$GIT" "not found"

cat << EOF > .1.c
#include <ck_spinlock.h>
int main(void){return 0;}
EOF

if [ -z "$CK_PATH" ]; then
	if [ ! -z "$CK_SUBMODULE" ]; then
			git submodule init ck
			git submodule update ck
			cd ck && ./configure && make && cd ..
			CK_PATH=ck
	fi
fi
if [ ! -z "$CK_PATH" ]; then
	MYCFLAGS=-I"$CK_PATH/include"
fi

$CC $MYCFLAGS -o .1 .1.c
r=$?
rm -f .1.c .1

if test "$r" -ne 0; then
	if [ -z "$CK_PATH" ]; then
		echo "concurrencykit headers not installed system-wide, and no --ck-path option provided. Consider calling configure with --fetch-ck." >& 2
		exit $EXIT_FAILURE
	else
		echo "Something went wrong wich concurrencykit. Most likely it was not built at '$CK_PATH'." >& 2
		exit $EXIT_FAILURE
	fi
else
	echo "success [ck]"
fi

rm -f .1.c .1

cat << EOF > .1.c
#include <sys/eventfd.h>
int main(void){eventfd(0, EFD_CLOEXEC | EFD_SEMAPHORE);return 0;}
EOF

$CC $MYCFLAGS -o .1 .1.c
r=$?
rm -f .1.c .1

if test "$r" -ne 0; then
	echo "eventfd(2) not found." >& 2
	exit $EXIT_FAILURE
else
	echo "success [eventfd]"
fi

echo "CFLAGS :=" > Makefile
if [ ! -z "$CK_PATH" ]; then
	echo "CFLAGS += -I\"$CK_PATH/include\"\n" >> Makefile
fi
cat Makefile.base >> Makefile

echo "success"