From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:39283) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sc9rQ-0003pL-D4 for qemu-devel@nongnu.org; Wed, 06 Jun 2012 02:36:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sc9rM-0002A2-8f for qemu-devel@nongnu.org; Wed, 06 Jun 2012 02:36:51 -0400 Received: from mail-pz0-f45.google.com ([209.85.210.45]:46266) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sc9rL-00028G-Vq for qemu-devel@nongnu.org; Wed, 06 Jun 2012 02:36:48 -0400 Received: by mail-pz0-f45.google.com with SMTP id v2so9050351dad.4 for ; Tue, 05 Jun 2012 23:36:46 -0700 (PDT) Sender: Paolo Bonzini From: Paolo Bonzini Date: Wed, 6 Jun 2012 08:36:10 +0200 Message-Id: <1338964592-22223-4-git-send-email-pbonzini@redhat.com> In-Reply-To: <1338964592-22223-1-git-send-email-pbonzini@redhat.com> References: <1338964592-22223-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH v2 03/25] build: add rules for nesting List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: anthony@codemonkey.ws This adds the 'magic' rules that take care of subdirectories. The subdirectory makefiles in the source tree are not complete; they only define some variables (listed in nested-vars) according to the configuration. The magic rules descend into subdirectory makefiles and gather the evaluated values of those variables. The values from all subdirectories are joined together, each prefixed with the subdirectory name, and used by the "real" makefiles. Signed-off-by: Paolo Bonzini --- rules.mak | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/rules.mak b/rules.mak index efef6f2..f65283c 100644 --- a/rules.mak +++ b/rules.mak @@ -73,3 +73,42 @@ TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py # will delete the target of a rule if commands exit with a nonzero exit status .DELETE_ON_ERROR: + +# magic to descend into other directories + +obj := . +old-nested-dirs := + +define push-var +$(eval save-$2-$1 = $(value $1)) +$(eval $1 :=) +endef + +define pop-var +$(eval subdir-$2-$1 := $(if $(filter $2,$(save-$2-$1)),$(addprefix $2,$($1)))) +$(eval $1 = $(value save-$2-$1) $$(subdir-$2-$1)) +$(eval save-$2-$1 :=) +endef + +define unnest-dir +$(foreach var,$(nested-vars),$(call push-var,$(var),$1/)) +$(eval obj := $(obj)/$1) +$(eval include $(SRC_PATH)/$1/Makefile.objs) +$(eval obj := $(patsubst %/$1,%,$(obj))) +$(foreach var,$(nested-vars),$(call pop-var,$(var),$1/)) +endef + +define unnest-vars-1 +$(eval nested-dirs := $(filter-out \ + $(old-nested-dirs), \ + $(sort $(foreach var,$(nested-vars), $(filter %/, $($(var))))))) +$(if $(nested-dirs), + $(foreach dir,$(nested-dirs),$(call unnest-dir,$(patsubst %/,%,$(dir)))) + $(eval old-nested-dirs := $(old-nested-dirs) $(nested-dirs)) + $(call unnest-vars-1)) +endef + +define unnest-vars +$(call unnest-vars-1) +$(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var))))) +endef -- 1.7.10.1