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[PATCH] build: generic top-level rule to build individual files
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Mar 2022 09:41:26 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>
- Delivery-date: Mon, 28 Mar 2022 07:41:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
In particular when cross-compiling or having in place other tool chain
overrides, invoking make to build individual files (e.g. object,
preprocessed, or assembly ones) so far involves putting the various
overrides on the command line instead of simply getting them from
./.config.
Furthermore this helps working around a yet unaddressed make quirk [1]:
Variables put on the command line are invisible to $(shell ...), unless
invoked from a recursive make: During the recursive invocation such
variables are put in the recursive make's environment and hence become
"visible".
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
[1] https://savannah.gnu.org/bugs/?10593
--- a/Makefile
+++ b/Makefile
@@ -75,6 +75,13 @@ ifeq (x86_64,$(XEN_TARGET_ARCH))
XEN_TARGET_ARCH=x86_32 $(MAKE) -C stubdom pv-grub-if-enabled
endif
+define do-subtree
+$(1)/%: FORCE
+ $$(MAKE) -C $(1) $$*
+endef
+
+$(foreach m,$(wildcard */Makefile),$(eval $(call do-subtree,$(patsubst
%/Makefile,%,$(m)))))
+
.PHONY: build-docs
build-docs:
$(MAKE) -C docs build
@@ -334,3 +341,6 @@ uninstall: uninstall-tools-public-header
.PHONY: xenversion
xenversion:
@$(MAKE) --no-print-directory -C xen xenversion
+
+PHONY += FORCE
+FORCE:
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