From 8eec96b7b8d937d40e2e7988edb8bbd08598c715 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Tue, 29 Mar 2022 15:48:15 +0200 Subject: [PATCH] build: generic top-level rule to build individual files 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 $(shell ...), unless invoked from a recursive make: During the recursive invocation such variables are put in the recursive make's environment and hence become "visible". Signed-off-by: Jan Beulich Reviewed-by: Anthony PERARD [1] https://savannah.gnu.org/bugs/?10593 --- Makefile | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Makefile b/Makefile index 346d73a0dc..b93b22c752 100644 --- a/Makefile +++ b/Makefile @@ -75,6 +75,13 @@ ifeq (x86_64,$(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-headers $(TARGS_UNINSTALL) .PHONY: xenversion xenversion: @$(MAKE) --no-print-directory -C xen xenversion + +.PHONY: FORCE +FORCE: -- 2.39.5