1cur_makefile := $(lastword $(MAKEFILE_LIST)) 2 3$(cur_makefile): ; 4 5# Backward compatibility 6asflags-y += $(EXTRA_AFLAGS) 7ccflags-y += $(EXTRA_CFLAGS) 8cppflags-y += $(EXTRA_CPPFLAGS) 9ldflags-y += $(EXTRA_LDFLAGS) 10 11# 12# flags that take effect in sub directories 13export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) 14export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) 15 16# Figure out what we need to build from the various variables 17# =========================================================================== 18 19# Handle archives 20# --------------------------------------------------------------------------- 21 22# Extract archives from $(obj-y) 23archive-y := $(filter %.a, $(obj-y)) 24archive-custom-valid := $(filter $(archive-custom), $(archive-y)) 25 26ifeq ($(archive-y),) 27archive-src-y := 28archive-bin-y := 29else # archive-y 30ifeq ($(FORCE_TO_USE_LIB),1) 31archive-bin-y := $(archive-y) 32else 33# Filter out archive-custom-valid 34archive-y := $(filter-out $(archive-custom-valid), $(archive-y)) 35 36# Extract archives that have source files available 37archive-src-y := $(foreach m, $(archive-y), $(if $(wildcard $(addprefix $(srctree)/$(src)/,$($(m:.a=-y):.o=.*))), $(m))) 38 39# Extract archives that do NOT have source files 40archive-bin-y := $(filter-out $(archive-src-y), $(archive-y)) 41endif 42 43# If the source files of the archive (including archive-custom-valid) exist, build the source files directly 44obj-y := $(filter-out $(archive-src-y) $(archive-custom-valid), $(obj-y)) $(foreach m, $(archive-src-y) $(archive-custom-valid), $($(m:.a=-y))) 45endif # archive-y 46 47# Handle composite objects 48# --------------------------------------------------------------------------- 49 50# if $(foo-objs) exists, foo.o is a composite object 51multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 52 53# Build list of the parts of our composite objects, our composite 54# objects depend on those (obviously) 55multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) 56multi-objs-subdir := $(patsubst %/,%,$(filter %/, $(multi-objs-y))) 57multi-objs-archive := $(filter %.a, $(multi-objs-y)) 58multi-objs-y := $(patsubst %/, %/built-in$(built_in_suffix), $(multi-objs-y)) 59multi-objs := $(multi-objs-y) 60 61define multi_subdir_built_in 62$(foreach m, $(1), $(if $($(m:.o=$(strip $2))), $(eval $(m:.o=$(strip $2)) := $(patsubst %/, %/built-in$(built_in_suffix), $($(m:.o=$(strip $2))))))) 63endef 64 65ifneq ($(multi-objs-subdir),) 66$(call multi_subdir_built_in,$(multi-used-y),-objs) 67$(call multi_subdir_built_in,$(multi-used-y),-y) 68endif 69 70ifneq ($(multi-objs-archive),) 71ifneq ($(filter $(archive-custom), $(multi-objs-archive)),) 72$(error Composite objects cannot be built from customized archives) 73endif 74mobjs-archive-src-y := 75mobjs-archive-bin-y := 76mobjs-archive-y := $(multi-objs-archive) 77 78ifeq ($(FORCE_TO_USE_LIB),1) 79mobjs-archive-bin-y += $(mobjs-archive-y) 80else 81# Extract archives that have source files available 82mobjs-archive-src-y += $(foreach m, $(mobjs-archive-y), $(if $(wildcard $(addprefix $(srctree)/$(src)/,$($(m:.a=-y):.o=.*))), $(m))) 83 84# Extract archives that do NOT have source files 85mobjs-archive-bin-y := $(filter-out $(mobjs-archive-src-y), $(mobjs-archive-y)) 86endif 87 88# If the source files of the archive (including archive-custom-valid) exist, build the source files directly 89mobjs-obj-y := $(foreach m, $(mobjs-archive-src-y), $($(m:.a=-y))) 90 91archive-y += $(mobjs-archive-y) 92archive-bin-y += $(mobjs-archive-bin-y) 93archive-src-y += $(mobjs-archive-src-y) 94obj-y += $(mobjs-obj-y) 95endif 96 97# Handle objects in subdirs 98# --------------------------------------------------------------------------- 99# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o or .a 100# and add the directory to the list of dirs to descend into: $(subdir-y) 101 102__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 103subdir-y += $(__subdir-y) 104obj-y := $(patsubst %/, %/built-in$(built_in_suffix), $(obj-y)) 105 106# Subdirectories we need to descend into 107subdir-y := $(sort $(subdir-y) $(multi-objs-subdir)) 108 109# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 110# tell kbuild to descend 111subdir-obj-y := $(filter %/built-in$(built_in_suffix), $(obj-y) $(multi-objs-y)) 112 113# $(obj-dirs) is a list of directories that contain object files 114obj-dirs := $(dir $(multi-objs) $(obj-y)) 115 116# Replace multi-part objects by their individual parts, look at local dir only 117real-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) 118 119# Add subdir path 120 121extra-y := $(addprefix $(obj)/,$(extra-y)) 122always := $(addprefix $(obj)/,$(always)) 123targets := $(addprefix $(obj)/,$(targets)) 124obj-y := $(addprefix $(obj)/,$(obj-y)) 125lib-y := $(addprefix $(obj)/,$(lib-y)) 126subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 127real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 128multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 129multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 130subdir-y := $(addprefix $(obj)/,$(subdir-y)) 131obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 132archive-y := $(addprefix $(obj)/,$(archive-y)) 133archive-src-y := $(addprefix $(obj)/,$(archive-src-y)) 134archive-bin-y := $(addprefix $(obj)/,$(archive-bin-y)) 135archive-custom-valid := $(addprefix $(obj)/,$(archive-custom-valid)) 136 137orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 138 $(ccflags-y) $(CFLAGS_$(basetarget).o) 139_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags) $(C_ONLY_FLAGS)) 140_c++_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags) $(C++_ONLY_FLAGS)) 141_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 142 $(asflags-y) $(AFLAGS_$(basetarget).o) 143_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 144 145# If building the kernel in a separate objtree expand all occurrences 146# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 147 148ifeq ($(KBUILD_SRC),) 149__c_flags = $(_c_flags) 150__c++_flags = $(_c++_flags) 151__a_flags = $(_a_flags) 152__cpp_flags = $(_cpp_flags) 153else 154 155# -I$(obj) locates generated .h files 156# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 157# and locates generated .h files 158# FIXME: Replace both with specific CFLAGS* statements in the makefiles 159__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) 160__c++_flags = $(call addtree,-I$(obj)) $(call flags,_c++_flags) 161__a_flags = $(call flags,_a_flags) 162__cpp_flags = $(call flags,_cpp_flags) 163endif 164 165ifeq ($(WIN_PLAT),y) 166# Not to include system header files in dependency files, 167# for there are space characters in system path by default. 168depfile_flags = -MMD -MP -MF $(depfile) 169else 170depfile_flags = -MD -MP -MF $(depfile) 171endif 172 173c_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__c_flags) 174 175c++_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__c++_flags) 176 177a_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__a_flags) 178 179a_cpp_flags = $(a_flags) 180 181cpp_flags = $(depfile_flags) $(NOSTDINC_FLAGS) $(__cpp_flags) 182 183ld_flags = $(LDFLAGS) $(ldflags-y) 184 185# Useful for describing the dependency of composite objects 186# Usage: 187# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 188define multi_depend 189$(foreach m, $(notdir $1), \ 190 $(eval $(obj)/$m: \ 191 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 192endef 193 194# Commands useful for building a boot image 195# =========================================================================== 196# 197# Use as following: 198# 199# target: source(s) FORCE 200# $(if_changed,ld/objcopy/gzip) 201# 202# and add target to extra-y so that we know we have to 203# read in the saved command line 204 205# Linking 206# --------------------------------------------------------------------------- 207 208quiet_cmd_ld = LD $@ 209cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 210 $(filter-out FORCE,$^) -o $@ 211 212# Objcopy 213# --------------------------------------------------------------------------- 214 215quiet_cmd_objcopy = OBJCOPY $@ 216cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 217 218