http://sourceware.org/ml/gdb-cvs/2011-03/msg00077.html

### src/gdb/gdbserver/ChangeLog	2011/03/04 06:31:54	1.463
### src/gdb/gdbserver/ChangeLog	2011/03/05 03:45:26	1.464
## -1,3 +1,10 @@
+2011-03-05  Yao Qi  <yao@codesourcery.com>
+
+	* Makefile.in (CLEANDIRS, REQUIRED_SUBDIRS): New variable.
+	(subdir_do): New make target.  Copied from gdb/Makefile.
+	(maintainer-clean, realclean, distclean, clean): Call corresponding
+	make targets in common/Makefile.
+
 2011-03-04  Yao Qi  <yao@codesourcery.com>
 
 	* Makefile.in: Remove GNU make feature --directory.
--- src/gdb/gdbserver/Makefile.in	2011/03/04 06:31:54	1.104
+++ src/gdb/gdbserver/Makefile.in	2011/03/05 03:45:26	1.105
@@ -136,6 +136,9 @@
 LIBCOMMON = $(LIBCOMMON_DIR)/libcommon.a
 LIBCOMMON_SRC = $(srcdir)/$(LIBCOMMON_DIR)
 
+CLEANDIRS = $(LIBCOMMON_DIR)
+REQUIRED_SUBDIRS = $(LIBCOMMON_DIR)
+
 SOURCES = $(SFILES)
 TAGFILES = $(SOURCES) ${HFILES} ${ALLPARAM} ${POSSLIBS}
 
@@ -291,6 +294,7 @@
 tags: TAGS
 
 clean:
+	@$(MAKE) $(FLAGS_TO_PASS) DO=clean "DODIRS=$(CLEANDIRS)" subdir_do
 	rm -f *.o ${ADD_FILES} *~
 	rm -f version.c
 	rm -f gdbserver$(EXEEXT) gdbreplay$(EXEEXT) core make.log
@@ -314,6 +318,7 @@
 	rm -f i386-mmx.c i386-mmx-linux.c
 
 maintainer-clean realclean distclean: clean
+	@$(MAKE) $(FLAGS_TO_PASS) DO=$@ "DODIRS=$(CLEANDIRS)" subdir_do
 	rm -f nm.h tm.h xm.h config.status config.h stamp-h config.log
 	rm -f Makefile
 
@@ -321,6 +326,22 @@
 stamp-h: config.in config.status
 	CONFIG_FILES="" CONFIG_HEADERS=config.h:config.in $(SHELL) ./config.status
 
+subdir_do: force
+	@for i in $(DODIRS); do \
+		case $$i in \
+		$(REQUIRED_SUBDIRS)) \
+			if [ ! -f ./$$i/Makefile ] ; then \
+				echo "Missing $$i/Makefile" >&2 ; \
+				exit 1 ; \
+			fi ;; \
+		esac ; \
+		if [ -f ./$$i/Makefile ] ; then \
+			if (cd ./$$i; \
+				$(MAKE) $(FLAGS_TO_PASS) $(DO)) ; then true ; \
+			else exit 1 ; fi ; \
+		else true ; fi ; \
+	done
+
 Makefile: Makefile.in config.status
 	CONFIG_HEADERS="" $(SHELL) ./config.status