1# Backward compatibility 2asflags-y += $(EXTRA_AFLAGS) 3ccflags-y += $(EXTRA_CFLAGS) 4cppflags-y += $(EXTRA_CPPFLAGS) 5ldflags-y += $(EXTRA_LDFLAGS) 6 7# 8# flags that take effect in sub directories 9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) 10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) 11 12# Figure out what we need to build from the various variables 13# =========================================================================== 14 15# When an object is listed to be built compiled-in and modular, 16# only build the compiled-in version 17 18obj-m := $(filter-out $(obj-y),$(obj-m)) 19 20# Libraries are always collected in one lib file. 21# Filter out objects already built-in 22 23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 24 25 26# Handle objects in subdirs 27# --------------------------------------------------------------------------- 28# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o 29# and add the directory to the list of dirs to descend into: $(subdir-y) 30# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 31# and add the directory to the list of dirs to descend into: $(subdir-m) 32 33# Determine modorder. 34# Unfortunately, we don't have information about ordering between -y 35# and -m subdirs. Just put -y's first. 36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) 37 38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 39subdir-y += $(__subdir-y) 40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) 41subdir-m += $(__subdir-m) 42obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) 43obj-m := $(filter-out %/, $(obj-m)) 44 45# Subdirectories we need to descend into 46 47subdir-ym := $(sort $(subdir-y) $(subdir-m)) 48 49# if $(foo-objs) exists, foo.o is a composite object 50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 52multi-used := $(multi-used-y) $(multi-used-m) 53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) 54 55# Build list of the parts of our composite objects, our composite 56# objects depend on those (obviously) 57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) 58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) 59multi-objs := $(multi-objs-y) $(multi-objs-m) 60 61# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 62# tell kbuild to descend 63subdir-obj-y := $(filter %/built-in.o, $(obj-y)) 64 65# $(obj-dirs) is a list of directories that contain object files 66obj-dirs := $(dir $(multi-objs) $(subdir-obj-y)) 67 68# Replace multi-part objects by their individual parts, look at local dir only 69real-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) 70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) 71 72# Add subdir path 73 74extra-y := $(addprefix $(obj)/,$(extra-y)) 75always := $(addprefix $(obj)/,$(always)) 76targets := $(addprefix $(obj)/,$(targets)) 77modorder := $(addprefix $(obj)/,$(modorder)) 78obj-y := $(addprefix $(obj)/,$(obj-y)) 79obj-m := $(addprefix $(obj)/,$(obj-m)) 80lib-y := $(addprefix $(obj)/,$(lib-y)) 81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 82real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 83real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) 84single-used-m := $(addprefix $(obj)/,$(single-used-m)) 85multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 86multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) 89subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 90obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 91 92# These flags are needed for modversions and compiling, so we define them here 93# already 94# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 95# end up in (or would, if it gets compiled in) 96# Note: It's possible that one object gets potentially linked into more 97# than one module. In that case KBUILD_MODNAME will be set to foo_bar, 98# where foo and bar are the name of the modules. 99name-fix = $(subst $(comma),_,$(subst -,_,$1)) 100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" 101modname_flags = $(if $(filter 1,$(words $(modname))),\ 102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") 103 104#hash values 105ifdef CONFIG_DYNAMIC_DEBUG 106debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\ 107 -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))" 108else 109debug_flags = 110endif 111 112orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 113 $(ccflags-y) $(CFLAGS_$(basetarget).o) 114_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) 115_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 116 $(asflags-y) $(AFLAGS_$(basetarget).o) 117_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 118 119# If building the kernel in a separate objtree expand all occurrences 120# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 121 122ifeq ($(KBUILD_SRC),) 123__c_flags = $(_c_flags) 124__a_flags = $(_a_flags) 125__cpp_flags = $(_cpp_flags) 126else 127 128# -I$(obj) locates generated .h files 129# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 130# and locates generated .h files 131# FIXME: Replace both with specific CFLAGS* statements in the makefiles 132__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) 133__a_flags = $(call flags,_a_flags) 134__cpp_flags = $(call flags,_cpp_flags) 135endif 136 137c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 138 $(__c_flags) $(modkern_cflags) \ 139 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \ 140 $(debug_flags) 141 142a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 143 $(__a_flags) $(modkern_aflags) 144 145cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 146 $(__cpp_flags) 147 148ld_flags = $(LDFLAGS) $(ldflags-y) 149 150# Finds the multi-part object the current object will be linked into 151modname-multi = $(sort $(foreach m,$(multi-used),\ 152 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 153 154# Shipped files 155# =========================================================================== 156 157quiet_cmd_shipped = SHIPPED $@ 158cmd_shipped = cat $< > $@ 159 160$(obj)/%:: $(src)/%_shipped 161 $(call cmd,shipped) 162 163# Commands useful for building a boot image 164# =========================================================================== 165# 166# Use as following: 167# 168# target: source(s) FORCE 169# $(if_changed,ld/objcopy/gzip) 170# 171# and add target to extra-y so that we know we have to 172# read in the saved command line 173 174# Linking 175# --------------------------------------------------------------------------- 176 177quiet_cmd_ld = LD $@ 178cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 179 $(filter-out FORCE,$^) -o $@ 180 181# Objcopy 182# --------------------------------------------------------------------------- 183 184quiet_cmd_objcopy = OBJCOPY $@ 185cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 186 187# Gzip 188# --------------------------------------------------------------------------- 189 190quiet_cmd_gzip = GZIP $@ 191cmd_gzip = gzip -f -9 < $< > $@ 192 193 194# Bzip2 195# --------------------------------------------------------------------------- 196 197# Bzip2 does not include size in file... so we have to fake that 198size_append=$(CONFIG_SHELL) $(srctree)/scripts/bin_size 199 200quiet_cmd_bzip2 = BZIP2 $@ 201cmd_bzip2 = (bzip2 -9 < $< && $(size_append) $<) > $@ || (rm -f $@ ; false) 202 203# Lzma 204# --------------------------------------------------------------------------- 205 206quiet_cmd_lzma = LZMA $@ 207cmd_lzma = (lzma -9 -c $< && $(size_append) $<) >$@ || (rm -f $@ ; false) 208