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###
# Main build makefile.
#
# Lots of this code have been borrowed or heavily inspired from parts
# of kbuild code, which is not credited, but mostly developed by:
#
# Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
# Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
#
PHONY := __build
__build:
ifeq ($(V),1)
quiet =
else
quiet=quiet_
endif
build-dir := $(srctree)/tools/build
# Generic definitions
include $(build-dir)/Build.include
# Init all relevant variables used in build files so
# 1) they have correct type
# 2) they do not inherit any value from the environment
subdir-y :=
obj-y :=
subdir-y :=
subdir-obj-y :=
# Build definitions
build-file := $(dir)/Build
include $(build-file)
# Compile command
quiet_cmd_cc_o_c = CC $@
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
# Link agregate command
# If there's nothing to link, create empty $@ object.
quiet_cmd_ld_multi = LD $@
cmd_ld_multi = $(if $(strip $(obj-y)),\
$(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
# Build rules
$(OUTPUT)%.o: %.c FORCE
$(call if_changed_dep,cc_o_c)
$(OUTPUT)%.o: %.S FORCE
$(call if_changed_dep,cc_o_c)
# Gather build data:
# obj-y - list of build objects
# subdir-y - list of directories to nest
# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
obj-y := $($(obj)-y)
subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
# '$(OUTPUT)/dir' prefix to all objects
prefix := $(subst ./,,$(OUTPUT)$(dir)/)
obj-y := $(addprefix $(prefix),$(obj-y))
subdir-obj-y := $(addprefix $(prefix),$(subdir-obj-y))
# Final '$(obj)-in.o' object
in-target := $(prefix)$(obj)-in.o
PHONY += $(subdir-y)
$(subdir-y):
@$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
$(sort $(subdir-obj-y)): $(subdir-y) ;
$(in-target): $(obj-y) FORCE
$(call rule_mkdir)
$(call if_changed,ld_multi)
__build: $(in-target)
@:
PHONY += FORCE
FORCE:
# Include all cmd files to get all the dependency rules
# for all objects included
targets := $(wildcard $(sort $(obj-y) $(in-target)))
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
ifneq ($(cmd_files),)
include $(cmd_files)
endif
.PHONY: $(PHONY)
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