218 lines
8 KiB
Makefile
218 lines
8 KiB
Makefile
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cur_makefile := $(lastword $(MAKEFILE_LIST))
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$(cur_makefile): ;
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# Backward compatibility
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asflags-y += $(EXTRA_AFLAGS)
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ccflags-y += $(EXTRA_CFLAGS)
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cppflags-y += $(EXTRA_CPPFLAGS)
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ldflags-y += $(EXTRA_LDFLAGS)
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#
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# flags that take effect in sub directories
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export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
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export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
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# Figure out what we need to build from the various variables
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# ===========================================================================
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# Handle archives
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# ---------------------------------------------------------------------------
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# Extract archives from $(obj-y)
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archive-y := $(filter %.a, $(obj-y))
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archive-custom-valid := $(filter $(archive-custom), $(archive-y))
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ifeq ($(archive-y),)
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archive-src-y :=
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archive-bin-y :=
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else # archive-y
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ifeq ($(FORCE_TO_USE_LIB),1)
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archive-bin-y := $(archive-y)
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else
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# Filter out archive-custom-valid
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archive-y := $(filter-out $(archive-custom-valid), $(archive-y))
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# Extract archives that have source files available
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archive-src-y := $(foreach m, $(archive-y), $(if $(wildcard $(addprefix $(srctree)/$(src)/,$($(m:.a=-y):.o=.*))), $(m)))
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# Extract archives that do NOT have source files
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archive-bin-y := $(filter-out $(archive-src-y), $(archive-y))
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endif
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# If the source files of the archive (including archive-custom-valid) exist, build the source files directly
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obj-y := $(filter-out $(archive-src-y) $(archive-custom-valid), $(obj-y)) $(foreach m, $(archive-src-y) $(archive-custom-valid), $($(m:.a=-y)))
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endif # archive-y
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# Handle composite objects
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# ---------------------------------------------------------------------------
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# if $(foo-objs) exists, foo.o is a composite object
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multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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# Build list of the parts of our composite objects, our composite
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# objects depend on those (obviously)
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multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
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multi-objs-subdir := $(patsubst %/,%,$(filter %/, $(multi-objs-y)))
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multi-objs-archive := $(filter %.a, $(multi-objs-y))
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multi-objs-y := $(patsubst %/, %/built-in$(built_in_suffix), $(multi-objs-y))
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multi-objs := $(multi-objs-y)
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define multi_subdir_built_in
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$(foreach m, $(1), $(if $($(m:.o=$(strip $2))), $(eval $(m:.o=$(strip $2)) := $(patsubst %/, %/built-in$(built_in_suffix), $($(m:.o=$(strip $2)))))))
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endef
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ifneq ($(multi-objs-subdir),)
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$(call multi_subdir_built_in,$(multi-used-y),-objs)
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$(call multi_subdir_built_in,$(multi-used-y),-y)
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endif
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ifneq ($(multi-objs-archive),)
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ifneq ($(filter $(archive-custom), $(multi-objs-archive)),)
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$(error Composite objects cannot be built from customized archives)
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endif
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mobjs-archive-src-y :=
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mobjs-archive-bin-y :=
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mobjs-archive-y := $(multi-objs-archive)
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ifeq ($(FORCE_TO_USE_LIB),1)
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mobjs-archive-bin-y += $(mobjs-archive-y)
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else
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# Extract archives that have source files available
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mobjs-archive-src-y += $(foreach m, $(mobjs-archive-y), $(if $(wildcard $(addprefix $(srctree)/$(src)/,$($(m:.a=-y):.o=.*))), $(m)))
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# Extract archives that do NOT have source files
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mobjs-archive-bin-y := $(filter-out $(mobjs-archive-src-y), $(mobjs-archive-y))
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endif
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# If the source files of the archive (including archive-custom-valid) exist, build the source files directly
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mobjs-obj-y := $(foreach m, $(mobjs-archive-src-y), $($(m:.a=-y)))
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archive-y += $(mobjs-archive-y)
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archive-bin-y += $(mobjs-archive-bin-y)
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archive-src-y += $(mobjs-archive-src-y)
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obj-y += $(mobjs-obj-y)
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endif
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# Handle objects in subdirs
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# ---------------------------------------------------------------------------
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o or .a
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# and add the directory to the list of dirs to descend into: $(subdir-y)
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__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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subdir-y += $(__subdir-y)
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obj-y := $(patsubst %/, %/built-in$(built_in_suffix), $(obj-y))
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# Subdirectories we need to descend into
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subdir-y := $(sort $(subdir-y) $(multi-objs-subdir))
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# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
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# tell kbuild to descend
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subdir-obj-y := $(filter %/built-in$(built_in_suffix), $(obj-y) $(multi-objs-y))
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# $(obj-dirs) is a list of directories that contain object files
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obj-dirs := $(dir $(multi-objs) $(obj-y))
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# Replace multi-part objects by their individual parts, look at local dir only
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real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
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# Add subdir path
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extra-y := $(addprefix $(obj)/,$(extra-y))
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always := $(addprefix $(obj)/,$(always))
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targets := $(addprefix $(obj)/,$(targets))
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obj-y := $(addprefix $(obj)/,$(obj-y))
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lib-y := $(addprefix $(obj)/,$(lib-y))
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subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
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real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
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multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
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multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
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subdir-y := $(addprefix $(obj)/,$(subdir-y))
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obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
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archive-y := $(addprefix $(obj)/,$(archive-y))
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archive-src-y := $(addprefix $(obj)/,$(archive-src-y))
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archive-bin-y := $(addprefix $(obj)/,$(archive-bin-y))
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archive-custom-valid := $(addprefix $(obj)/,$(archive-custom-valid))
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orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
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$(ccflags-y) $(CFLAGS_$(basetarget).o)
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags) $(C_ONLY_FLAGS))
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_c++_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags) $(C++_ONLY_FLAGS))
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_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
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$(asflags-y) $(AFLAGS_$(basetarget).o)
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_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
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# If building the kernel in a separate objtree expand all occurrences
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# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
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ifeq ($(KBUILD_SRC),)
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__c_flags = $(_c_flags)
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__c++_flags = $(_c++_flags)
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__a_flags = $(_a_flags)
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__cpp_flags = $(_cpp_flags)
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else
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# -I$(obj) locates generated .h files
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# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
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# and locates generated .h files
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# FIXME: Replace both with specific CFLAGS* statements in the makefiles
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__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
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__c++_flags = $(call addtree,-I$(obj)) $(call flags,_c++_flags)
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__a_flags = $(call flags,_a_flags)
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__cpp_flags = $(call flags,_cpp_flags)
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endif
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ifeq ($(WIN_PLAT),y)
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# Not to include system header files in dependency files,
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# for there are space characters in system path by default.
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depfile_flags = -MMD -MP -MF $(depfile)
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else
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depfile_flags = -MD -MP -MF $(depfile)
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endif
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c_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__c_flags)
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c++_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__c++_flags)
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a_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__a_flags)
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a_cpp_flags = $(a_flags)
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cpp_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__cpp_flags)
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ld_flags = $(LDFLAGS) $(ldflags-y)
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# Useful for describing the dependency of composite objects
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# Usage:
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# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
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define multi_depend
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$(foreach m, $(notdir $1), \
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$(eval $(obj)/$m: \
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$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
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endef
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# Commands useful for building a boot image
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# ===========================================================================
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#
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# Use as following:
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#
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# target: source(s) FORCE
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# $(if_changed,ld/objcopy/gzip)
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#
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# and add target to extra-y so that we know we have to
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# read in the saved command line
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# Linking
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# ---------------------------------------------------------------------------
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quiet_cmd_ld = LD $@
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cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
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$(filter-out FORCE,$^) -o $@
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# Objcopy
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# ---------------------------------------------------------------------------
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quiet_cmd_objcopy = OBJCOPY $@
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cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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