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