From 9e4140329ee9a787d0f96ac2829d618d47f7973f Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Tue, 4 Feb 2014 17:24:24 +0900 Subject: kbuild: change out-of-tree build This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C " syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=" syntax for descending into sub-directories. (We can write it like "make $(obj)=" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada Tested-by: Gerhard Sittig --- scripts/Makefile.build | 57 ++++++++++++++++++++++++++++++++------------------ 1 file changed, 37 insertions(+), 20 deletions(-) (limited to 'scripts/Makefile.build') diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 7789efab82..52a44ff377 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -2,17 +2,28 @@ .PHONY: all all: +ifeq ($(CONFIG_TPL_BUILD),y) + src := $(patsubst tpl/%,%,$(obj)) +else + ifeq ($(CONFIG_SPL_BUILD),y) + src := $(patsubst spl/%,%,$(obj)) + else + src := $(obj) + endif +endif + include $(srctree)/scripts/Kbuild.include -include $(TOPDIR)/config.mk +include $(srctree)/config.mk # variable LIB is used in examples/standalone/Makefile -__LIB := $(obj)built-in.o -LIBGCC = $(obj)libgcc.o +__LIB := $(obj)/built-in.o +LIBGCC = $(obj)/libgcc.o SRCS := subdir-y := obj-dirs := -include Makefile +kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) +include $(kbuild-dir)/Makefile # Do not include host rules unless needed ifneq ($(hostprogs-y)$(hostprogs-m),) @@ -28,31 +39,37 @@ lib-y := $(sort $(lib-y)) subdir-y += $(patsubst %/,%,$(filter %/, $(obj-y))) obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) subdir-obj-y := $(filter %/built-in.o, $(obj-y)) -subdir-obj-y := $(addprefix $(obj),$(subdir-obj-y)) +subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) + +SRCS += $(obj-y:.o=.c) $(obj-y:.o=.S) $(lib-y:.o=.c) \ + $(lib-y:.o=.S) $(extra-y:.o=.c) $(extra-y:.o=.S) -SRCS += $(wildcard $(obj-y:.o=.c) $(obj-y:.o=.S) $(lib-y:.o=.c) \ - $(lib-y:.o=.S) $(extra-y:.o=.c) $(extra-y:.o=.S)) -OBJS := $(addprefix $(obj),$(obj-y)) +SRCS := $(addprefix $(if $(KBUILD_SRC),$(srctree)/$(src)/,$(src)/),$(SRCS)) +SRCS := $(wildcard $(SRCS)) + +OBJS := $(addprefix $(obj)/,$(obj-y)) # $(obj-dirs) is a list of directories that contain object files obj-dirs += $(dir $(OBJS)) +_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj)) + # Create directories for object files if directory does not exist # Needed when obj-y := dir/file.o syntax is used _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d))) -LGOBJS := $(addprefix $(obj),$(sort $(lib-y))) +LGOBJS := $(addprefix $(obj)/,$(sort $(lib-y))) -all: $(__LIB) $(addprefix $(obj),$(extra-y) $(always)) $(subdir-y) +all: $(__LIB) $(addprefix $(obj)/,$(extra-y) $(always)) $(subdir-y) -$(__LIB): $(obj).depend $(OBJS) +$(__LIB): $(obj)/.depend $(OBJS) $(call cmd_link_o_target, $(OBJS)) ifneq ($(strip $(lib-y)),) all: $(LIBGCC) -$(LIBGCC): $(obj).depend $(LGOBJS) +$(LIBGCC): $(obj)/.depend $(LGOBJS) $(call cmd_link_o_target, $(LGOBJS)) endif @@ -63,7 +80,7 @@ endif ifneq ($(subdir-y),) $(subdir-y): FORCE - $(MAKE) -C $@ -f $(TOPDIR)/scripts/Makefile.build + $(MAKE) $(build)=$(obj)/$@ endif ######################################################################### @@ -78,18 +95,18 @@ ALL_CFLAGS += $(EXTRA_CPPFLAGS) # See rules.mk EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ $(CPPFLAGS_$(BCURDIR)) -$(obj)%.s: %.S +$(obj)/%.s: $(src)/%.S $(CPP) $(ALL_AFLAGS) -o $@ $< -$(obj)%.o: %.S +$(obj)/%.o: $(src)/%.S $(CC) $(ALL_AFLAGS) -o $@ $< -c -$(obj)%.o: %.c +$(obj)/%.o: $(src)/%.c ifneq ($(CHECKSRC),0) $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< endif $(CC) $(ALL_CFLAGS) -o $@ $< -c -$(obj)%.i: %.c +$(obj)/%.i: $(src)/%.c $(CPP) $(ALL_CFLAGS) -o $@ $< -c -$(obj)%.s: %.c +$(obj)/%.s: $(src)/%.c $(CC) $(ALL_CFLAGS) -o $@ $< -c -S # If the list of objects to link is empty, just create an empty built-in.o @@ -99,11 +116,11 @@ cmd_link_o_target = $(if $(strip $1),\ ######################################################################### -# defines $(obj).depend target +# defines $(obj)/.depend target include $(TOPDIR)/rules.mk -sinclude $(obj).depend +sinclude $(obj)/.depend ######################################################################### -- cgit v1.2.1