abuild: implement -dbg subpackages

Patch from Andrew Manison.

ref #626

abuild.in

@@ -1245,6 +1245,31 @@ doc() {
 	default_doc
 }
 
+# predefined splitfunc doc
+default_dbg() {
+	local f
+	binfiles=$(scanelf -R "$pkgdir" | grep ET_DYN | sed "s:$pkgdir\/::g" | sed "s:ET_DYN ::g")
+	for f in $binfiles; do
+		srcdir=$(dirname $pkgdir/$f)
+		srcfile=$(basename $pkgdir/$f)
+		dstdir=$(dirname $subpkgdir/usr/lib/debug/$f.debug)
+		dstfile=$(basename $subpkgdir/usr/lib/debug/$f.debug)
+		if [ ! -d $dstdir ] ; then
+			mkdir -p $dstdir
+		fi
+		cd $srcdir
+		objcopy --only-keep-debug $srcfile $dstfile
+		objcopy --add-gnu-debuglink=$dstfile $srcdir/$srcfile
+		mv $dstfile $dstdir
+		strip $srcfile
+	done
+	return 0
+}
+
+dbg() {
+	default_dbg
+}
+
 # predefined splitfunc dev
 default_dev() {
 	local i= j=
@@ -1675,6 +1700,14 @@ subpackages_has() {
 	return 1
 }
 
+subpackage_types_has() {
+	local i
+	for i in $subpackages; do
+		[ "$1" = "${i##*-}" ] && return 0
+	done
+	return 1
+}
+
 list_has() {
 	local needle="$1"
 	local i
@@ -1946,7 +1979,7 @@ else
 fi
 
 # if we want build debug package
-if [ -n "$DEBUG" ]; then
+if [ -n "$DEBUG" ] || subpackage_types_has "dbg"; then
 	CFLAGS="$CFLAGS -g"
 	options="$options !strip"
 fi