[build] Fix version.o dependency upon git index

Commit 8540300 ("[build] Disable ccache for all relevant build
targets") attempted to generalise the rule for $(BIN)/version.o to
$(BIN)/version.% in order to apply the dependency to all relevant
build targets (debug objects, assembly listings, etc).

This generalisation appears to work for the ccache override
directives, but seems to cause make (at least, GNU make 4.0) to simply
ignore the dependency upon the git index.

Since version.c contains only some string constants, there is unlikely
to be a substantive need for its debug objects, assembly listings,
etc.  Restore the previous form of the dependency and accept that
hypothetical builds with e.g. DEBUG=version will not be handled
correctly.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index e240a738625d4bc2e3b7c343336a7fbefcd251dc..33283b18cbbca3230e7b022646a2b4a285aa0211 100644 (file)
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -705,7 +705,7 @@ CFLAGS_version += -DVERSION_MAJOR=$(VERSION_MAJOR) \
                  -DVERSION="\"$(VERSION)\""
 # Make sure the version number gets updated on every git checkout
 ifneq ($(GITVERSION),)
-$(BIN)/version.% : ../.git/index
+$(BIN)/version.o : ../.git/index
 endif
 
 # We automatically generate rules for any file mentioned in AUTO_SRCS