stubdom: simplify and fix Makefile

The stubdom Makefile is setting up links for various libraries. This
is done only once when qemu links are created and each library's links
are updated/created only if the link for the Makefile of the library
isn't already existing. In case a source is added to one library after
doing the first make of stubdom the new source won't be linked by a
new call of make.

Instead of testing the existence of the Makefile link use a make
dependency which will catch changes of the linked Makefile, too.

At the same time don't repeat the same link pattern 7 times but use a
make macro to do the linking.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
[ wei: move "touch $@" to correct location in do_links ]
Signed-off-by: Wei Liu <wei.liu2@citrix.com>

stubdom/Makefile

@@ -305,7 +305,41 @@ ioemu/linkfarm.stamp:
 	touch ioemu/linkfarm.stamp
 endif
 
-mk-headers-$(XEN_TARGET_ARCH): $(IOEMU_LINKFARM_TARGET)
+define do_links
+  mkdir -p $(dir $@)include
+  cd $(dir $@); \
+  ln -sf $(dir $<)include/*.h include/; \
+  ln -sf $(dir $<)*.[ch] .; \
+  ln -sf $(dir $<)Makefile .
+  touch $@
+endef
+
+libs-$(XEN_TARGET_ARCH)/toollog/stamp: $(XEN_ROOT)/tools/libs/toollog/Makefile
+	$(do_links)
+
+libs-$(XEN_TARGET_ARCH)/evtchn/stamp: $(XEN_ROOT)/tools/libs/evtchn/Makefile
+	$(do_links)
+
+libs-$(XEN_TARGET_ARCH)/gnttab/stamp: $(XEN_ROOT)/tools/libs/gnttab/Makefile
+	$(do_links)
+
+libs-$(XEN_TARGET_ARCH)/call/stamp: $(XEN_ROOT)/tools/libs/call/Makefile
+	$(do_links)
+
+libs-$(XEN_TARGET_ARCH)/foreignmemory/stamp: $(XEN_ROOT)/tools/libs/foreignmemory/Makefile
+	$(do_links)
+
+libxc-$(XEN_TARGET_ARCH)/stamp: $(XEN_ROOT)/tools/libxc/Makefile
+	$(do_links)
+
+xenstore/stamp: $(XEN_ROOT)/tools/xenstore/Makefile
+	$(do_links)
+
+LINK_LIBS_DIRS := toollog evtchn gnttab call foreignmemory
+LINK_DIRS := libxc-$(XEN_TARGET_ARCH) xenstore $(foreach dir,$(LINK_LIBS_DIRS),libs-$(XEN_TARGET_ARCH)/$(dir))
+LINK_STAMPS := $(foreach dir,$(LINK_DIRS),$(dir)/stamp)
+
+mk-headers-$(XEN_TARGET_ARCH): $(IOEMU_LINKFARM_TARGET) $(LINK_STAMPS)
 	$(MAKE) -C $(XEN_ROOT)/tools/include
 	mkdir -p include/xen && \
           ln -sf $(wildcard $(XEN_ROOT)/xen/include/public/*.h) include/xen && \
@@ -316,47 +350,6 @@ mk-headers-$(XEN_TARGET_ARCH): $(IOEMU_LINKFARM_TARGET)
 	  ln -sf $(wildcard $(XEN_ROOT)/tools/include/xen-foreign/*) include/xen-foreign/ && \
 	  $(MAKE) DESTDIR= -C include/xen-foreign/ && \
 	  ( [ -h include/xen/foreign ] || ln -sf ../xen-foreign include/xen/foreign )
-	mkdir -p libs-$(XEN_TARGET_ARCH)/toollog/include
-	[ -h libs-$(XEN_TARGET_ARCH)/toollog/Makefile ] || ( cd libs-$(XEN_TARGET_ARCH)/toollog && \
-	  ln -sf $(XEN_ROOT)/tools/libs/toollog/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libs/toollog/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/toollog/Makefile . )
-	mkdir -p libs-$(XEN_TARGET_ARCH)/evtchn/include
-	[ -h libs-$(XEN_TARGET_ARCH)/evtchn/Makefile ] || ( cd libs-$(XEN_TARGET_ARCH)/evtchn && \
-	  ln -sf $(XEN_ROOT)/tools/libs/evtchn/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/evtchn/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libs/evtchn/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/evtchn/Makefile . )
-	mkdir -p libs-$(XEN_TARGET_ARCH)/gnttab/include
-	[ -h libs-$(XEN_TARGET_ARCH)/gnttab/Makefile ] || ( cd libs-$(XEN_TARGET_ARCH)/gnttab && \
-	  ln -sf $(XEN_ROOT)/tools/libs/gnttab/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/gnttab/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libs/gnttab/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/gnttab/Makefile . )
-	mkdir -p libs-$(XEN_TARGET_ARCH)/call/include
-	[ -h libs-$(XEN_TARGET_ARCH)/call/Makefile ] || ( cd libs-$(XEN_TARGET_ARCH)/call && \
-	  ln -sf $(XEN_ROOT)/tools/libs/call/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/call/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libs/call/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/call/Makefile . )
-	mkdir -p libs-$(XEN_TARGET_ARCH)/foreignmemory/include
-	[ -h libs-$(XEN_TARGET_ARCH)/foreignmemory/Makefile ] || ( cd libs-$(XEN_TARGET_ARCH)/foreignmemory && \
-	  ln -sf $(XEN_ROOT)/tools/libs/foreignmemory/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/foreignmemory/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libs/foreignmemory/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libs/foreignmemory/Makefile . )
-	mkdir -p libxc-$(XEN_TARGET_ARCH)/include
-	[ -h libxc-$(XEN_TARGET_ARCH)/Makefile ] || ( cd libxc-$(XEN_TARGET_ARCH) && \
-	  ln -sf $(XEN_ROOT)/tools/libxc/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/libxc/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/libxc/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/libxc/Makefile . )
-	mkdir -p xenstore/include
-	[ -h xenstore/Makefile ] || ( cd xenstore && \
-	  ln -sf $(XEN_ROOT)/tools/xenstore/*.c . && \
-	  ln -sf $(XEN_ROOT)/tools/xenstore/*.h . && \
-	  ln -sf $(XEN_ROOT)/tools/xenstore/include/*.h include/ && \
-	  ln -sf $(XEN_ROOT)/tools/xenstore/Makefile . )
 	$(MAKE) DESTDIR= -C $(MINI_OS) links
 	touch mk-headers-$(XEN_TARGET_ARCH)