[RFC] Provide source files for useful debug packages

Debug packages are fairly useless currently because the soucre files
needed for stepping through code etc are not packaged with them. This
patch adds the needed source files to the debug package and adjusts
the debug info to look at the /usr/src/debug/ directory for them rather
than the build location.  This requires using the "debugedit" program
which is provided as part of the RPM sources.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/libmakepkg/tidy/strip.sh.in

@@ -35,6 +35,11 @@ build_id() {
 	LANG=C readelf -n $1 | sed -n '/Build ID/ { s/.*: //p; q; }'
 }
 
+source_files() {
+	LANG=C readelf $1 --debug-dump | \
+		awk '/DW_AT_name +:/{name=$8}/DW_AT_comp_dir +:/{print $8 "/" name}'
+}
+
 strip_file() {
 	local binary=$1; shift
 
@@ -50,6 +55,18 @@ strip_file() {
 			return
 		fi
 
+		# copy source files to debug directory
+		local f t
+		for f in $(source_files "$binary"); do
+			t=${f/$srcdir/$dbgsrc}
+			mkdir -p "${t%/*}"
+			cp "$f" "$t"
+		done
+
+		# adjust debug symbols to point at sources
+		debugedit -b "${srcdir}" -d /usr/src/debug/ -i "$binary" &> /dev/null
+
+		# copy debug symbols to debug directory
 		mkdir -p "$dbgdir/${binary%/*}"
 		objcopy --only-keep-debug "$binary" "$dbgdir/$binary.debug"
 		objcopy --add-gnu-debuglink="$dbgdir/${binary#/}.debug" "$binary"
@@ -89,7 +106,8 @@ tidy_strip() {
 
 		if check_option "debug" "y"; then
 			dbgdir="$pkgdir-@DEBUGSUFFIX@/usr/lib/debug"
-			mkdir -p "$dbgdir"
+			dbgsrc="$pkgdir-@DEBUGSUFFIX@/usr/src/debug"
+			mkdir -p "$dbgdir" "$dbgsrc"
 		fi
 
 		local binary strip_flags