[Xen-changelog] [xen-unstable] [POWERPC][XEN] Builtin cmdline dependency rule

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Hollis Blanchard <hollisb@xxxxxxxxxx>
# Node ID b58670602d35b2900a19e85c0f79e5aae2b6afdc
# Parent  020fc58ba873f300d89cdd3345027d9e81bca3f0
[POWERPC][XEN] Builtin cmdline dependency rule
Rebuild cmdline.o when the user changes the CMDLINE=X argument passed to
the make invocation. I couldn't find an example of another project that
handles this case properly, so I came up with this.
Signed-off-by: Amos Waterland <apw@xxxxxxxxxx>
Signed-off-by: Hollis Blanchard <hollisb@xxxxxxxxxx>
---
 .hgignore                 |    1 +
 xen/arch/powerpc/Makefile |   16 +++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff -r 020fc58ba873 -r b58670602d35 .hgignore
--- a/.hgignore Wed Oct 04 17:27:16 2006 -0500
+++ b/.hgignore Thu Oct 05 15:48:26 2006 -0500
@@ -222,6 +222,7 @@
 ^xen/arch/powerpc/xen\.lds$
 ^xen/arch/powerpc/.xen-syms$
 ^xen/arch/powerpc/xen-syms.S$
+^xen/arch/powerpc/cmdline.dep$
 ^unmodified_drivers/linux-2.6/\.tmp_versions
 ^unmodified_drivers/linux-2.6/.*\.cmd$
 ^unmodified_drivers/linux-2.6/.*\.ko$
diff -r 020fc58ba873 -r b58670602d35 xen/arch/powerpc/Makefile
--- a/xen/arch/powerpc/Makefile Wed Oct 04 17:27:16 2006 -0500
+++ b/xen/arch/powerpc/Makefile Thu Oct 05 15:48:26 2006 -0500
@@ -80,6 +80,20 @@ ifneq ($(CMDLINE),)
 # The first token in the arguments will be silently dropped.
 FULL_CMDLINE := xen $(CMDLINE)
 endif
+
+ifeq ($(wildcard cmdline.dep),)
+cmdline.dep:
+       echo $(FULL_CMDLINE) > cmdline.dep
+else
+ifneq ($(FULL_CMDLINE),$(shell cat cmdline.dep))
+cmdline.dep::
+       echo $(FULL_CMDLINE) > cmdline.dep
+else
+cmdline.dep:
+endif
+endif
+
+cmdline.o: cmdline.dep
 cmdline.o: CFLAGS += -DCMDLINE="\"$(FULL_CMDLINE)\""
 
 TARGET_OPTS = $(OMAGIC) -Wl,-Ttext,0x400000,-T,xen.lds
@@ -123,4 +137,4 @@ dom0.bin: $(DOM0_IMAGE)
 
 clean::
        $(MAKE) -f $(BASEDIR)/Rules.mk -C of_handler clean
-       rm -f firmware firmware_image.bin dom0.bin .xen-syms
+       rm -f firmware firmware_image.bin dom0.bin .xen-syms cmdline.dep

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