configure

#!/bin/sh

disable_dwarf=false
prefix='/usr'

# parse options
for opt in $@; do
	key=`echo $opt | cut -d'=' -f1`
	value=`echo $opt | cut -sd'=' -f2`
	case $key in
	'--disable-debug_line')
		disable_dwarf=true
		;;
	'--prefix')
		prefix=$value
		;;
	'--version')
		echo "version: 1.0"
		exit 0
		;;
	'--help')
		echo "Usage: ./configure [options]"
		echo "Options:"
		echo "  --disable-debug_line"
		echo "        If you do not have libdw or libdwarf, set this to disable it,"
		echo "        and you will not see file name and line number in backtrace."
		echo "  --prefix=<path>"
		echo "        Set install path. default is '/usr/'."
		echo "  --version"
		echo "        Show version."
		echo "  --help"
		echo "        Show this message."
		exit 0
		;;
	*)
		echo "invalid option: $opt. Try --help."
		exit 1
		;;
	esac
done


# check OS and machine type, GNU/Linux-x86_64 or FreeBSD-amd64
echo 'checking OS and machine type...'
machine_type=`uname -m`
os_type=`uname`
case $os_type in
'Linux')
	if [ $machine_type != x86_64 ] ; then
		echo "Error: unsupported machine type: $machine_type. Only x86_64 is supported."
		exit 2
	fi
	CFLAGS="$CFLAGS -DMLX_LINUX"
	echo "on GNU/Linux."
	;;
'FreeBSD')
	if [ $machine_type != amd64 ] ; then
		echo "Error: unsupported machine type: $machine_type. Only amd64 is supported."
		exit 2
	fi
	CFLAGS="$CFLAGS -DMLX_FREEBSD"
	LDLIBS="$LDLIBS -lprocstat -lutil"
	CFLAGS="$CFLAGS -I/usr/local/include/"
	LDFLAGS="$LDFLAGS -L/usr/local/lib/"
	echo "on FreeBSD."
	;;
*)
	echo "Error: unsupported OS type: $os_type."
	echo "Only GNU/Linux and FreeBSD are supported."
	exit 2
	;;
esac


# check libraries
echo 'checking libraries...'
check_lib()
{
	lib=$1
	header=$2
	function=$3
	cflags=$4
	ldflags=$5

	echo "checking $lib..."
	cat << EOF > tmp.c
		#include <$header>
		#include <stdio.h>
		int main() {
			$function;
			return 0;
		}
EOF
	if ! cc -M $CFLAGS $cflags tmp.c >/dev/null 2>&1 ; then
		echo "$lib-devel is missing."
		rm -f tmp.c
		return 1
	fi
	if ! cc $CFLAGS $cflags tmp.c -o tmp $LDFLAGS $LDLIBS $ldflags >/dev/null 2>&1 ; then
		echo "$lib is missing."
		rm -f tmp.c tmp
		return 1
	fi
	rm -f tmp.c tmp
	return 0
}

# - check libunwind
LDLIBS="$LDLIBS -lunwind-ptrace -lunwind -lunwind-x86_64"
if ! check_lib libunwind libunwind.h "unw_create_addr_space(NULL,0)" ; then
	echo "Error: libunwind-devel is required."
	exit 1
fi

# - check libelf
LDLIBS="$LDLIBS -lelf"
if ! check_lib libelf libelf.h "elf_begin(0,0,NULL)" ; then
	echo "Error: libelf-devel is required."
	exit 1
fi

# - check libdwarf
if ! $disable_dwarf; then
	if check_lib libdw libdw.h "dwarf_begin(0,0)" "-I/usr/include/elfutils" "-ldw"; then
		CFLAGS="$CFLAGS -DMLX_WITH_LIBDW -I/usr/include/elfutils/"
		LDLIBS="$LDLIBS -ldw"
	elif check_lib libdwarf libdwarf.h "dwarf_init(0,0,0,0,NULL,NULL)" "-I/usr/include/libdwarf" "-ldwarf"; then
		CFLAGS="$CFLAGS -DMLX_WITH_LIBDWARF -I/usr/include/libdwarf/"
		LDLIBS="$LDLIBS -ldwarf"
	else
		echo "Error: libdw or libdwarf is required."
		echo "Try '--disable-debug_line' to disable it."
	fi
fi


# check done, generate Makefile
echo 'generate Makefile...'
SOURCES="breakpoint.c debug_file.c debug_line.c memleax.c ptr_backtrace.c callstack.c memblock.c proc_info.c symtab.c addr_maps.c"

cat << EOF > Makefile
CFLAGS = $CFLAGS -g -O2 -Wall
LDLIBS = $LDLIBS
LDFLAGS = $LDFLAGS
PREFIX = $prefix

TARGET = memleax

SOURCES = $SOURCES
OBJS = `echo $SOURCES | sed 's/\.c/\.o/g'`

EOF

cat << 'EOF' >> Makefile
$(TARGET) : $(OBJS)
	$(CC) -o $@ $(OBJS) $(LDFLAGS) $(LDLIBS)

clean :
	rm -f $(OBJS) $(TARGET)

install :
	mkdir -p $(PREFIX)/bin/
	install $(TARGET) $(PREFIX)/bin/
uninstall :
	rm -f $(PREFIX)/bin/$(TARGET)

EOF

cc -MM $CFLAGS $SOURCES >> Makefile

# done
echo 'done.'