make only needs to read Makefile.incs once, thanks to the

SECONDEXPANSION feature of GNU make (and we rely on GNU make for lots of
things already)

File paths are relative to the root directory, which simplifies
debugging (make V=1 gives shorter command lines) and helps ccache
finding matches for checkouts in different directories (even though it
should normalize paths itself)

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5304 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

Makefile

@@ -33,9 +33,9 @@ HOSTCXX:=$(CC_real) --hostcxx
 endif
 
 export top := $(PWD)
-export src := $(top)/src
+export src := src
 export srck := $(top)/util/kconfig
-export obj ?= $(top)/build
+export obj ?= build
 export objk := $(obj)/util/kconfig
 export sconfig := $(top)/util/sconfig
 export yapps2_py := $(sconfig)/yapps2.py
@@ -136,9 +136,12 @@ all:
 	chmod +x .ccwrap
 	scan-build $(CONFIG_SCANBUILD_REPORT_LOCATION) -analyze-headers --use-cc=$(top)/.ccwrap --use-c++=$(top)/.ccwrap $(MAKE) INNER_SCANBUILD=y
 else
-all: $(obj)/config.h coreboot
+all: $(obj)/config.h $(obj)/build.h coreboot
 endif
 
+# must come rather early
+.SECONDEXPANSION:
+
 $(obj)/config.h:
 	$(MAKE) oldconfig
 
@@ -156,7 +159,7 @@ $(obj)/mainboard/$(MAINBOARDDIR)/config.py: $(yapps2_py) $(config_g)
 # Creation of these is architecture and mainboard independent
 $(obj)/mainboard/$(MAINBOARDDIR)/static.c: $(src)/mainboard/$(MAINBOARDDIR)/devicetree.cb  $(obj)/mainboard/$(MAINBOARDDIR)/config.py
 	mkdir -p $(obj)/mainboard/$(MAINBOARDDIR)
-	(cd $(obj)/mainboard/$(MAINBOARDDIR) ; PYTHONPATH=$(top)/util/sconfig export PYTHONPATH; python config.py  $(MAINBOARDDIR) $(top) $(obj)/mainboard/$(MAINBOARDDIR))
+	(PYTHONPATH=$(top)/util/sconfig python $(obj)/mainboard/$(MAINBOARDDIR)/config.py  $(MAINBOARDDIR) $(top) $(obj)/mainboard/$(MAINBOARDDIR))
 
 objs:=$(obj)/mainboard/$(MAINBOARDDIR)/static.o
 initobjs:=
@@ -173,12 +176,12 @@ includemakefiles= \
 	$(foreach type,$(2), $(eval $(type)-y:=)) \
 	$(eval subdirs-y:=) \
 	$(eval -include $(1)) \
-	$(if $(strip $(3)), \
-		$(foreach type,$(2), \
-			$(eval $(type)s+= \
-				$$(abspath $$(patsubst src/%, \
-						$(obj)/%, \
-						$$(addprefix $(dir $(1)),$$($(type)-y))))))) \
+	$(foreach type,$(2), \
+		$(eval $(type)s+= \
+			$$(subst $(top)/,, \
+			$$(abspath $$(patsubst src/%, \
+					$(obj)/%, \
+					$$(addprefix $(dir $(1)),$$($(type)-y))))))) \
 	$(eval subdirs+=$$(subst $(PWD)/,,$$(abspath $$(addprefix $(dir $(1)),$$(subdirs-y)))))
 
 # For each path in $(subdirs) call includemakefiles, passing $(1) as $(3)
@@ -187,12 +190,12 @@ evaluate_subdirs= \
 	$(eval cursubdirs:=$(subdirs)) \
 	$(eval subdirs:=) \
 	$(foreach dir,$(cursubdirs), \
-		$(eval $(call includemakefiles,$(dir)/Makefile.inc,$(types),$(1)))) \
-	$(if $(subdirs),$(eval $(call evaluate_subdirs, $(1))))
+		$(eval $(call includemakefiles,$(dir)/Makefile.inc,$(types)))) \
+	$(if $(subdirs),$(eval $(call evaluate_subdirs)))
 
 # collect all object files eligible for building
 subdirs:=$(PLATFORM-y) $(BUILD-y)
-$(eval $(call evaluate_subdirs, modify))
+$(eval $(call evaluate_subdirs))
 
 initobjs:=$(addsuffix .initobj.o, $(basename $(initobjs)))
 drivers:=$(addsuffix .driver.o, $(basename $(drivers)))
@@ -203,17 +206,10 @@ alldirs:=$(sort $(abspath $(dir $(allobjs))))
 source_with_ext=$(patsubst $(obj)/%.o,src/%.$(1),$(allobjs))
 allsrc=$(wildcard $(call source_with_ext,c) $(call source_with_ext,S))
 
-POST_EVALUATION:=y
-
-# fetch rules (protected in POST_EVALUATION) that rely on the variables filled above
-subdirs:=$(PLATFORM-y) $(BUILD-y)
-$(eval $(call evaluate_subdirs))
-
-
 define objs_asl_template
 $(obj)/$(1)%.o: src/$(1)%.asl
 	@printf "    IASL       $$(subst $(top)/,,$$(@))\n"
-	$(CPP) -D__ACPI__ -P -include $(obj)/config.h -I$(src) -I$(src)/mainboard/$(MAINBOARDDIR) $$< -o $$(basename $$@).asl
+	$(CPP) -D__ACPI__ -P -include $(abspath $(obj)/config.h) -I$(src) -I$(src)/mainboard/$(MAINBOARDDIR) $$< -o $$(basename $$@).asl
 	iasl -p $$(basename $$@) -tc $$(basename $$@).asl
 	mv $$(basename $$@).hex $$(basename $$@).c
 	$(CC) $$(CFLAGS) $$(if $$(subst dsdt,,$$(basename $$(notdir $$@))), -DAmlCode=AmlCode_$$(basename $$(notdir $$@))) -c -o $$@ $$(basename $$@).c
@@ -226,7 +222,7 @@ define create_cc_template
 # $3 .o infix ("" ".initobj", ...)
 # $4 additional compiler flags
 de$(EMPTY)fine $(1)_$(2)_template
-$(obj)/$$(1)%$(3).o: src/$$(1)%.$(2) $(obj)/config.h
+$(obj)/$$(1)%$(3).o: src/$$(1)%.$(2) | $(obj)/build.h $(obj)/config.h
 	printf "    CC         $$$$(subst $$$$(obj)/,,$$$$(@))\n"
 	$(CC) $(4) -MMD $$$$(CFLAGS) -c -o $$$$@ $$$$<
 en$(EMPTY)def
@@ -270,9 +266,10 @@ printcrt0s:
 	@echo $(patsubst $(top)/%,%,$(crt0s))
 
 OBJS     := $(patsubst %,$(obj)/%,$(TARGETS-y))
-INCLUDES := -I$(top)/src -I$(top)/src/include -I$(obj) -I$(top)/src/arch/$(ARCHDIR-y)/include 
-INCLUDES += -I$(top)/src/devices/oprom/include
-INCLUDES += -include $(obj)/config.h
+INCLUDES := -Isrc -Isrc/include -I$(obj) -Isrc/arch/$(ARCHDIR-y)/include 
+INCLUDES += -Isrc/devices/oprom/include
+# abspath is a workaround for romcc
+INCLUDES += -include $(abspath $(obj)/config.h) -include $(abspath $(obj)/build.h)
 
 CFLAGS = $(INCLUDES) -Os -nostdinc -pipe
 CFLAGS += -nostdlib -Wall -Wundef -Wstrict-prototypes -Wmissing-prototypes
@@ -298,7 +295,7 @@ prepare:
 	mkdir -p $(obj)/util/kconfig/lxdialog $(obj)/util/cbfstool
 	test -n "$(alldirs)" && mkdir -p $(alldirs) || true
 
-$(obj)/build.h: .xcompile
+$(obj)/build.h $(abspath $(obj)/build.h): .xcompile
 	@printf "    GEN        build.h\n"
 	rm -f $(obj)/build.h
 	printf "/* build system definitions (autogenerated) */\n" > $(obj)/build.ht