| # Backward compatibility | |
| asflags-y += $(EXTRA_AFLAGS) | |
| ccflags-y += $(EXTRA_CFLAGS) | |
| cppflags-y += $(EXTRA_CPPFLAGS) | |
| ldflags-y += $(EXTRA_LDFLAGS) | |
| # Figure out what we need to build from the various variables | |
| # =========================================================================== | |
| # When an object is listed to be built compiled-in and modular, | |
| # only build the compiled-in version | |
| obj-m := $(filter-out $(obj-y),$(obj-m)) | |
| # Libraries are always collected in one lib file. | |
| # Filter out objects already built-in | |
| lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) | |
| # Handle objects in subdirs | |
| # --------------------------------------------------------------------------- | |
| # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o | |
| # and add the directory to the list of dirs to descend into: $(subdir-y) | |
| # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) | |
| # and add the directory to the list of dirs to descend into: $(subdir-m) | |
| # Determine modorder. | |
| # Unfortunately, we don't have information about ordering between -y | |
| # and -m subdirs. Just put -y's first. | |
| modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) | |
| __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) | |
| subdir-y += $(__subdir-y) | |
| __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) | |
| subdir-m += $(__subdir-m) | |
| obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) | |
| obj-m := $(filter-out %/, $(obj-m)) | |
| # Subdirectories we need to descend into | |
| subdir-ym := $(sort $(subdir-y) $(subdir-m)) | |
| # if $(foo-objs) exists, foo.o is a composite object | |
| multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) | |
| multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) | |
| multi-used := $(multi-used-y) $(multi-used-m) | |
| single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) | |
| # Build list of the parts of our composite objects, our composite | |
| # objects depend on those (obviously) | |
| multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) | |
| multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) | |
| multi-objs := $(multi-objs-y) $(multi-objs-m) | |
| # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to | |
| # tell kbuild to descend | |
| subdir-obj-y := $(filter %/built-in.o, $(obj-y)) | |
| # $(obj-dirs) is a list of directories that contain object files | |
| obj-dirs := $(dir $(multi-objs) $(subdir-obj-y)) | |
| # Replace multi-part objects by their individual parts, look at local dir only | |
| 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) | |
| real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) | |
| # Add subdir path | |
| extra-y := $(addprefix $(obj)/,$(extra-y)) | |
| always := $(addprefix $(obj)/,$(always)) | |
| targets := $(addprefix $(obj)/,$(targets)) | |
| modorder := $(addprefix $(obj)/,$(modorder)) | |
| obj-y := $(addprefix $(obj)/,$(obj-y)) | |
| obj-m := $(addprefix $(obj)/,$(obj-m)) | |
| lib-y := $(addprefix $(obj)/,$(lib-y)) | |
| subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) | |
| real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) | |
| real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) | |
| single-used-m := $(addprefix $(obj)/,$(single-used-m)) | |
| multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) | |
| multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) | |
| multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) | |
| multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) | |
| subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) | |
| obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) | |
| # These flags are needed for modversions and compiling, so we define them here | |
| # already | |
| # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will | |
| # end up in (or would, if it gets compiled in) | |
| # Note: It's possible that one object gets potentially linked into more | |
| # than one module. In that case KBUILD_MODNAME will be set to foo_bar, | |
| # where foo and bar are the name of the modules. | |
| name-fix = $(subst $(comma),_,$(subst -,_,$1)) | |
| basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" | |
| modname_flags = $(if $(filter 1,$(words $(modname))),\ | |
| -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") | |
| #hash values | |
| ifdef CONFIG_DYNAMIC_PRINTK_DEBUG | |
| debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\ | |
| -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))" | |
| else | |
| debug_flags = | |
| endif | |
| orig_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o) | |
| _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) | |
| _a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o) | |
| _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) | |
| # If building the kernel in a separate objtree expand all occurrences | |
| # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). | |
| ifeq ($(KBUILD_SRC),) | |
| __c_flags = $(_c_flags) | |
| __a_flags = $(_a_flags) | |
| __cpp_flags = $(_cpp_flags) | |
| else | |
| # -I$(obj) locates generated .h files | |
| # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files | |
| # and locates generated .h files | |
| # FIXME: Replace both with specific CFLAGS* statements in the makefiles | |
| __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) | |
| __a_flags = $(call flags,_a_flags) | |
| __cpp_flags = $(call flags,_cpp_flags) | |
| endif | |
| c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ | |
| $(__c_flags) $(modkern_cflags) \ | |
| -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \ | |
| $(debug_flags) | |
| a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \ | |
| $(__a_flags) $(modkern_aflags) | |
| cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags) | |
| ld_flags = $(LDFLAGS) $(ldflags-y) | |
| # Finds the multi-part object the current object will be linked into | |
| modname-multi = $(sort $(foreach m,$(multi-used),\ | |
| $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) | |
| # Shipped files | |
| # =========================================================================== | |
| quiet_cmd_shipped = SHIPPED $@ | |
| cmd_shipped = cat $< > $@ | |
| $(obj)/%:: $(src)/%_shipped | |
| $(call cmd,shipped) | |
| # Commands useful for building a boot image | |
| # =========================================================================== | |
| # | |
| # Use as following: | |
| # | |
| # target: source(s) FORCE | |
| # $(if_changed,ld/objcopy/gzip) | |
| # | |
| # and add target to extra-y so that we know we have to | |
| # read in the saved command line | |
| # Linking | |
| # --------------------------------------------------------------------------- | |
| quiet_cmd_ld = LD $@ | |
| cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ | |
| $(filter-out FORCE,$^) -o $@ | |
| # Objcopy | |
| # --------------------------------------------------------------------------- | |
| quiet_cmd_objcopy = OBJCOPY $@ | |
| cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ | |
| # Gzip | |
| # --------------------------------------------------------------------------- | |
| quiet_cmd_gzip = GZIP $@ | |
| cmd_gzip = gzip -f -9 < $< > $@ | |