mini-os: build fixes

Make .o rules depend on the includes. Before, only the final link step
depended on setting up the includes directory, making parallel builds
unreliable.

Make symlinks use explicit make rules instead of using a phony target.
Avoids unnecessary rebuilds.

[talex5@gmail.com: bring back "make links", for stubdom]
Signed-off-by: Thomas Leonard <talex5@gmail.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

diff --git a/Makefile b/Makefile
index 50d038b8a55843f6a65dc3e355f927bc5a144861..6d6537ea45c719bf77985403e29c83b2aca39dda 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -50,6 +50,11 @@ flags-$(CONFIG_XENBUS) += -DCONFIG_XENBUS
 
 DEF_CFLAGS += $(flags-y)
 
+# Symlinks and headers that must be created before building the C files
+GENERATED_HEADERS := include/list.h $(ARCH_LINKS) include/mini-os include/xen include/$(TARGET_ARCH_FAM)/mini-os
+
+EXTRA_DEPS += $(GENERATED_HEADERS)
+
 # Include common mini-os makerules.
 include minios.mk
 
@@ -124,11 +129,18 @@ include/list.h: $(XEN_ROOT)/tools/include/xen-external/bsd-sys-queue-h-seddery $
        perl $^ --prefix=minios  >$@.new
        $(call move-if-changed,$@.new,$@)
 
+# Used by stubdom's Makefile
 .PHONY: links
-links: include/list.h $(ARCH_LINKS)
-       [ -e include/xen ] || ln -sf ../../../xen/include/public include/xen
-       [ -e include/mini-os ] || ln -sf . include/mini-os
-       [ -e include/$(TARGET_ARCH_FAM)/mini-os ] || ln -sf . include/$(TARGET_ARCH_FAM)/mini-os
+links: $(GENERATED_HEADERS)
+
+include/xen:
+       ln -sf ../../../xen/include/public $@
+
+include/mini-os:
+       ln -sf . $@
+
+include/$(TARGET_ARCH_FAM)/mini-os:
+       ln -sf . $@
 
 .PHONY: arch_lib
 arch_lib:
@@ -174,7 +186,7 @@ ifneq ($(APP_OBJS),)
 APP_O=$(OBJ_DIR)/$(TARGET)_app.o 
 endif
 
-$(OBJ_DIR)/$(TARGET): links include/list.h $(OBJS) $(APP_O) arch_lib
+$(OBJ_DIR)/$(TARGET): $(OBJS) $(APP_O) arch_lib
        $(LD) -r $(LDFLAGS) $(HEAD_OBJ) $(APP_O) $(OBJS) $(LDARCHLIB) $(LDLIBS) -o $@.o
        $(OBJCOPY) -w -G $(GLOBAL_PREFIX)* -G _start $@.o $@.o
        $(LD) $(LDFLAGS) $(LDFLAGS_FINAL) $@.o $(EXTRA_OBJS) -o $@
@@ -212,4 +224,3 @@ tags:
 .PHONY: TAGS
 TAGS:
        $(all_sources) | xargs etags
-