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162 lines
3.9 KiB
162 lines
3.9 KiB
# SPDX-License-Identifier: GPL-2.0 |
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### |
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# Main build makefile. |
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# |
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# Lots of this code have been borrowed or heavily inspired from parts |
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# of kbuild code, which is not credited, but mostly developed by: |
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# |
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# Copyright (C) Sam Ravnborg <[email protected]>, 2015 |
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# Copyright (C) Linus Torvalds <[email protected]>, 2015 |
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# |
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PHONY := __build |
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__build: |
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ifeq ($(V),1) |
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quiet = |
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Q = |
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else |
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quiet=quiet_ |
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Q=@ |
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endif |
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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
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quiet=silent_ |
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endif |
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build-dir := $(srctree)/tools/build |
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# Define $(fixdep) for dep-cmd function |
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ifeq ($(OUTPUT),) |
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fixdep := $(build-dir)/fixdep |
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else |
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fixdep := $(OUTPUT)/fixdep |
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endif |
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# Generic definitions |
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include $(build-dir)/Build.include |
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# do not force detected configuration |
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-include $(OUTPUT).config-detected |
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# Init all relevant variables used in build files so |
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# 1) they have correct type |
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# 2) they do not inherit any value from the environment |
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subdir-y := |
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obj-y := |
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subdir-y := |
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subdir-obj-y := |
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# Build definitions |
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build-file := $(dir)/Build |
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-include $(build-file) |
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quiet_cmd_flex = FLEX $@ |
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quiet_cmd_bison = BISON $@ |
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# Create directory unless it exists |
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quiet_cmd_mkdir = MKDIR $(dir $@) |
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cmd_mkdir = mkdir -p $(dir $@) |
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rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) |
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# Compile command |
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quiet_cmd_cc_o_c = CC $@ |
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
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quiet_cmd_host_cc_o_c = HOSTCC $@ |
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cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< |
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quiet_cmd_cxx_o_c = CXX $@ |
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cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< |
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quiet_cmd_cpp_i_c = CPP $@ |
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cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $< |
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quiet_cmd_cc_s_c = AS $@ |
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cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< |
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quiet_cmd_gen = GEN $@ |
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# Link agregate command |
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# If there's nothing to link, create empty $@ object. |
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quiet_cmd_ld_multi = LD $@ |
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cmd_ld_multi = $(if $(strip $(obj-y)),\ |
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$(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) |
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quiet_cmd_host_ld_multi = HOSTLD $@ |
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cmd_host_ld_multi = $(if $(strip $(obj-y)),\ |
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$(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) |
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ifneq ($(filter $(obj),$(hostprogs)),) |
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host = host_ |
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endif |
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# Build rules |
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$(OUTPUT)%.o: %.c FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,$(host)cc_o_c) |
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$(OUTPUT)%.o: %.cpp FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,cxx_o_c) |
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$(OUTPUT)%.o: %.S FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,$(host)cc_o_c) |
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$(OUTPUT)%.i: %.c FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,cpp_i_c) |
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$(OUTPUT)%.s: %.S FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,cpp_i_c) |
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$(OUTPUT)%.s: %.c FORCE |
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$(call rule_mkdir) |
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$(call if_changed_dep,cc_s_c) |
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# Gather build data: |
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# obj-y - list of build objects |
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# subdir-y - list of directories to nest |
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# subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' |
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obj-y := $($(obj)-y) |
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subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
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obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) |
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subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) |
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# '$(OUTPUT)/dir' prefix to all objects |
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objprefix := $(subst ./,,$(OUTPUT)$(dir)/) |
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obj-y := $(addprefix $(objprefix),$(obj-y)) |
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subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) |
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# Final '$(obj)-in.o' object |
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in-target := $(objprefix)$(obj)-in.o |
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PHONY += $(subdir-y) |
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$(subdir-y): |
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$(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) |
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$(sort $(subdir-obj-y)): $(subdir-y) ; |
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$(in-target): $(obj-y) FORCE |
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$(call rule_mkdir) |
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$(call if_changed,$(host)ld_multi) |
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__build: $(in-target) |
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@: |
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PHONY += FORCE |
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FORCE: |
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# Include all cmd files to get all the dependency rules |
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# for all objects included |
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targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) |
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cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
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ifneq ($(cmd_files),) |
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include $(cmd_files) |
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endif |
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.PHONY: $(PHONY)
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