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