[3320] | 1 | # Backward compatibility - to be removed...
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| 2 | extra-y += $(EXTRA_TARGETS)
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| 3 | # Figure out what we need to build from the various variables
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| 4 | # ===========================================================================
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| 5 |
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| 6 | # When an object is listed to be built compiled-in and modular,
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| 7 | # only build the compiled-in version
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| 8 |
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| 9 | obj-m := $(filter-out $(obj-y),$(obj-m))
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| 10 |
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| 11 | # Libraries are always collected in one lib file.
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| 12 | # Filter out objects already built-in
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| 13 |
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| 14 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
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| 15 |
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| 16 |
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| 17 | # Handle objects in subdirs
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| 18 | # ---------------------------------------------------------------------------
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| 19 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
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| 20 | # and add the directory to the list of dirs to descend into: $(subdir-y)
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| 21 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
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| 22 | # and add the directory to the list of dirs to descend into: $(subdir-m)
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| 23 |
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| 24 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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| 25 | subdir-y += $(__subdir-y)
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| 26 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
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| 27 | subdir-m += $(__subdir-m)
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| 28 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
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| 29 | obj-m := $(filter-out %/, $(obj-m))
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| 30 |
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| 31 | # Subdirectories we need to descend into
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| 32 |
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| 33 | subdir-ym := $(sort $(subdir-y) $(subdir-m))
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| 34 |
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| 35 | # if $(foo-objs) exists, foo.o is a composite object
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| 36 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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| 37 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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| 38 | multi-used := $(multi-used-y) $(multi-used-m)
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| 39 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
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| 40 |
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| 41 | # Build list of the parts of our composite objects, our composite
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| 42 | # objects depend on those (obviously)
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| 43 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
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| 44 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
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| 45 | multi-objs := $(multi-objs-y) $(multi-objs-m)
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| 46 |
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| 47 | # $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
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| 48 | # in the local directory
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| 49 | subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
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| 50 |
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| 51 | # $(obj-dirs) is a list of directories that contain object files
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| 52 | obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
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| 53 |
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| 54 | # Replace multi-part objects by their individual parts, look at local dir only
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| 55 | 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)
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| 56 | real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
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| 57 |
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| 58 | # Add subdir path
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| 59 |
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| 60 | extra-y := $(addprefix $(obj)/,$(extra-y))
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| 61 | always := $(addprefix $(obj)/,$(always))
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| 62 | targets := $(addprefix $(obj)/,$(targets))
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| 63 | obj-y := $(addprefix $(obj)/,$(obj-y))
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| 64 | obj-m := $(addprefix $(obj)/,$(obj-m))
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| 65 | lib-y := $(addprefix $(obj)/,$(lib-y))
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| 66 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
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| 67 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
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| 68 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
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| 69 | single-used-m := $(addprefix $(obj)/,$(single-used-m))
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| 70 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
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| 71 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
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| 72 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
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| 73 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
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| 74 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
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| 75 | obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
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| 76 |
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| 77 | # These flags are needed for modversions and compiling, so we define them here
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| 78 | # already
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| 79 | # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
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| 80 | # end up in (or would, if it gets compiled in)
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| 81 | # Note: It's possible that one object gets potentially linked into more
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| 82 | # than one module. In that case KBUILD_MODNAME will be set to foo_bar,
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| 83 | # where foo and bar are the name of the modules.
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| 84 | name-fix = $(subst $(comma),_,$(subst -,_,$1))
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| 85 | basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))"
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| 86 | modname_flags = $(if $(filter 1,$(words $(modname))),\
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| 87 | -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
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| 88 |
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| 89 | _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
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| 90 | _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
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| 91 | _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
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| 92 |
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| 93 | # If building the kernel in a separate objtree expand all occurrences
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| 94 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
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| 95 |
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| 96 | ifeq ($(KBUILD_SRC),)
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| 97 | __c_flags = $(_c_flags)
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| 98 | __a_flags = $(_a_flags)
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| 99 | __cpp_flags = $(_cpp_flags)
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| 100 | else
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| 101 |
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| 102 | # -I$(obj) locates generated .h files
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| 103 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
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| 104 | # and locates generated .h files
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| 105 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles
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| 106 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
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| 107 | __a_flags = $(call flags,_a_flags)
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| 108 | __cpp_flags = $(call flags,_cpp_flags)
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| 109 | endif
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| 110 |
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| 111 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
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| 112 | $(__c_flags) $(modkern_cflags) \
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| 113 | -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
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| 114 |
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| 115 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
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| 116 | $(__a_flags) $(modkern_aflags)
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| 117 |
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| 118 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
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| 119 |
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| 120 | # Seems to be a wrong thing to do. LDFLAGS contains gcc's flags,
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| 121 | # yet ld_flags is fed to ld.
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| 122 | #ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
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| 123 | # Remove the -Wl, prefix from linker options normally passed through gcc
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| 124 | ld_flags = $(filter-out -Wl$(comma)%,$(LDFLAGS) $(EXTRA_LDFLAGS))
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| 125 |
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| 126 |
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| 127 | # Finds the multi-part object the current object will be linked into
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| 128 | modname-multi = $(sort $(foreach m,$(multi-used),\
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| 129 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
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| 130 |
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| 131 | # Shipped files
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| 132 | # ===========================================================================
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| 133 |
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| 134 | quiet_cmd_shipped = SHIPPED $@
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| 135 | cmd_shipped = cat $< > $@
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| 136 |
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| 137 | $(obj)/%:: $(src)/%_shipped
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| 138 | $(call cmd,shipped)
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| 139 |
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| 140 | # Commands useful for building a boot image
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| 141 | # ===========================================================================
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| 142 | #
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| 143 | # Use as following:
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| 144 | #
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| 145 | # target: source(s) FORCE
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| 146 | # $(if_changed,ld/objcopy/gzip)
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| 147 | #
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| 148 | # and add target to EXTRA_TARGETS so that we know we have to
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| 149 | # read in the saved command line
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| 150 |
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| 151 | # Linking
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| 152 | # ---------------------------------------------------------------------------
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| 153 |
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| 154 | # TODO: LDFLAGS usually is supposed to contain gcc's flags, not ld's.
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| 155 | # but here we feed them to ld!
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| 156 | quiet_cmd_ld = LD $@
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| 157 | cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
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| 158 | $(filter-out FORCE,$^) -o $@
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| 159 |
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| 160 | # Objcopy
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| 161 | # ---------------------------------------------------------------------------
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| 162 |
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| 163 | quiet_cmd_objcopy = OBJCOPY $@
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| 164 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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| 165 |
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| 166 | # Gzip
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| 167 | # ---------------------------------------------------------------------------
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| 168 |
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| 169 | quiet_cmd_gzip = GZIP $@
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| 170 | cmd_gzip = gzip -f -9 < $< > $@
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