scripts/Makefile.lib

   1 # Backward compatibility
   2 asflags-y  += $(EXTRA_AFLAGS)
   3 ccflags-y  += $(EXTRA_CFLAGS)
   4 cppflags-y += $(EXTRA_CPPFLAGS)
   5 ldflags-y  += $(EXTRA_LDFLAGS)
   6
   7 #
   8 # flags that take effect in sub directories
   9 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
  10 export 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
  18 obj-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
  23 lib-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.
  36 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  37
  38 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  39 subdir-y        += $(__subdir-y)
  40 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  41 subdir-m        += $(__subdir-m)
  42 obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  43 obj-m           := $(filter-out %/, $(obj-m))
  44
  45 # Subdirectories we need to descend into
  46
  47 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  48
  49 # if $(foo-objs) exists, foo.o is a composite object
  50 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  51 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
  52 multi-used   := $(multi-used-y) $(multi-used-m)
  53 single-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)
  57 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  58 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  59 multi-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
  63 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  64
  65 # $(obj-dirs) is a list of directories that contain object files
  66 obj-dirs := $(dir $(multi-objs) $(obj-y))
  67
  68 # Replace multi-part objects by their individual parts, look at local dir only
  69 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)
  70 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))
  71
  72 # Add subdir path
  73
  74 extra-y         := $(addprefix $(obj)/,$(extra-y))
  75 always          := $(addprefix $(obj)/,$(always))
  76 targets         := $(addprefix $(obj)/,$(targets))
  77 modorder        := $(addprefix $(obj)/,$(modorder))
  78 obj-y           := $(addprefix $(obj)/,$(obj-y))
  79 obj-m           := $(addprefix $(obj)/,$(obj-m))
  80 lib-y           := $(addprefix $(obj)/,$(lib-y))
  81 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  82 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  83 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  84 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  85 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  86 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  87 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  88 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  89 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  90 obj-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: Files that end up in two or more modules are compiled without the
  97 #       KBUILD_MODNAME definition. The reason is that any made-up name would
  98 #       differ in different configs.
  99 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
 100 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
 101 modname_flags  = $(if $(filter 1,$(words $(modname))),\
 102                  -DKBUILD_MODNAME=$(call name-fix,$(modname)))
 103
 104 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 105                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 106 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 107 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 108                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 109 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 110 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 111
 112 #
 113 # Enable gcov profiling flags for a file, directory or for all files depending
 114 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 115 # (in this order)
 116 #
 117 ifeq ($(CONFIG_GCOV_KERNEL),y)
 118 _c_flags += $(if $(patsubst n%,, \
 119                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 120                 $(CFLAGS_GCOV))
 121 endif
 122
 123 #
 124 # Enable address sanitizer flags for kernel except some files or directories
 125 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 126 #
 127 ifeq ($(CONFIG_KASAN),y)
 128 _c_flags += $(if $(patsubst n%,, \
 129                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 130                 $(CFLAGS_KASAN))
 131 endif
 132
 133 ifeq ($(CONFIG_UBSAN),y)
 134 _c_flags += $(if $(patsubst n%,, \
 135                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 136                 $(CFLAGS_UBSAN))
 137 endif
 138
 139 ifeq ($(CONFIG_KCOV),y)
 140 _c_flags += $(if $(patsubst n%,, \
 141         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 142         $(CFLAGS_KCOV))
 143 endif
 144
 145 # If building the kernel in a separate objtree expand all occurrences
 146 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 147
 148 ifeq ($(KBUILD_SRC),)
 149 __c_flags       = $(_c_flags)
 150 __a_flags       = $(_a_flags)
 151 __cpp_flags     = $(_cpp_flags)
 152 else
 153
 154 # -I$(obj) locates generated .h files
 155 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 156 #   and locates generated .h files
 157 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 158 __c_flags       = $(if $(obj),-I$(srctree)/$(src) -I$(obj)) \
 159                   $(call flags,_c_flags)
 160 __a_flags       = $(call flags,_a_flags)
 161 __cpp_flags     = $(call flags,_cpp_flags)
 162 endif
 163
 164 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 165                  $(__c_flags) $(modkern_cflags)                           \
 166                  $(basename_flags) $(modname_flags)
 167
 168 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 169                  $(__a_flags) $(modkern_aflags)
 170
 171 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 172                  $(__cpp_flags)
 173
 174 ld_flags       = $(LDFLAGS) $(ldflags-y)
 175
 176 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 177                  -I$(srctree)/arch/$(SRCARCH)/boot/dts                   \
 178                  -I$(srctree)/arch/$(SRCARCH)/boot/dts/include           \
 179                  -I$(srctree)/drivers/of/testcase-data                   \
 180                  -undef -D__DTS__
 181
 182 # Finds the multi-part object the current object will be linked into
 183 modname-multi = $(sort $(foreach m,$(multi-used),\
 184                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 185
 186 # Useful for describing the dependency of composite objects
 187 # Usage:
 188 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 189 define multi_depend
 190 $(foreach m, $(notdir $1), \
 191         $(eval $(obj)/$m: \
 192         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 193 endef
 194
 195 ifdef REGENERATE_PARSERS
 196
 197 # GPERF
 198 # ---------------------------------------------------------------------------
 199 quiet_cmd_gperf = GPERF $@
 200       cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
 201
 202 .PRECIOUS: $(src)/%.hash.c_shipped
 203 $(src)/%.hash.c_shipped: $(src)/%.gperf
 204         $(call cmd,gperf)
 205
 206 # LEX
 207 # ---------------------------------------------------------------------------
 208 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 209
 210 quiet_cmd_flex = LEX     $@
 211       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 212
 213 .PRECIOUS: $(src)/%.lex.c_shipped
 214 $(src)/%.lex.c_shipped: $(src)/%.l
 215         $(call cmd,flex)
 216
 217 # YACC
 218 # ---------------------------------------------------------------------------
 219 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 220
 221 quiet_cmd_bison = YACC    $@
 222       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 223
 224 .PRECIOUS: $(src)/%.tab.c_shipped
 225 $(src)/%.tab.c_shipped: $(src)/%.y
 226         $(call cmd,bison)
 227
 228 quiet_cmd_bison_h = YACC    $@
 229       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 230
 231 .PRECIOUS: $(src)/%.tab.h_shipped
 232 $(src)/%.tab.h_shipped: $(src)/%.y
 233         $(call cmd,bison_h)
 234
 235 endif
 236
 237 # Shipped files
 238 # ===========================================================================
 239
 240 quiet_cmd_shipped = SHIPPED $@
 241 cmd_shipped = cat $< > $@
 242
 243 $(obj)/%: $(src)/%_shipped
 244         $(call cmd,shipped)
 245
 246 # Commands useful for building a boot image
 247 # ===========================================================================
 248 #
 249 #       Use as following:
 250 #
 251 #       target: source(s) FORCE
 252 #               $(if_changed,ld/objcopy/gzip)
 253 #
 254 #       and add target to extra-y so that we know we have to
 255 #       read in the saved command line
 256
 257 # Linking
 258 # ---------------------------------------------------------------------------
 259
 260 quiet_cmd_ld = LD      $@
 261 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 262                $(filter-out FORCE,$^) -o $@
 263
 264 # Objcopy
 265 # ---------------------------------------------------------------------------
 266
 267 quiet_cmd_objcopy = OBJCOPY $@
 268 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 269
 270 # Gzip
 271 # ---------------------------------------------------------------------------
 272
 273 quiet_cmd_gzip = GZIP    $@
 274 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 275         (rm -f $@ ; false)
 276
 277 # DTC
 278 # ---------------------------------------------------------------------------
 279 DTC ?= $(objtree)/scripts/dtc/dtc
 280
 281 # Disable noisy checks by default
 282 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
 283 DTC_FLAGS += -Wno-unit_address_vs_reg
 284 endif
 285
 286 # Generate an assembly file to wrap the output of the device tree compiler
 287 quiet_cmd_dt_S_dtb= DTB     $@
 288 cmd_dt_S_dtb=                                           \
 289 (                                                       \
 290         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 291         echo '.section .dtb.init.rodata,"a"';           \
 292         echo '.balign STRUCT_ALIGNMENT';                \
 293         echo '.global __dtb_$(*F)_begin';               \
 294         echo '__dtb_$(*F)_begin:';                      \
 295         echo '.incbin "$<" ';                           \
 296         echo '__dtb_$(*F)_end:';                        \
 297         echo '.global __dtb_$(*F)_end';                 \
 298         echo '.balign STRUCT_ALIGNMENT';                \
 299 ) > $@
 300
 301 $(obj)/%.dtb.S: $(obj)/%.dtb
 302         $(call cmd,dt_S_dtb)
 303
 304 quiet_cmd_dtc = DTC     $@
 305 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 306         $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 307         $(DTC) -O dtb -o $@ -b 0 \
 308                 -i $(dir $<) $(DTC_FLAGS) \
 309                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 310         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 311
 312 $(obj)/%.dtb: $(src)/%.dts FORCE
 313         $(call if_changed_dep,dtc)
 314
 315 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 316
 317 # Bzip2
 318 # ---------------------------------------------------------------------------
 319
 320 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 321 # append the size as a 32-bit littleendian number as gzip does.
 322 size_append = printf $(shell                                            \
 323 dec_size=0;                                                             \
 324 for F in $1; do                                                         \
 325         fsize=$$(stat -c "%s" $$F);                                     \
 326         dec_size=$$(expr $$dec_size + $$fsize);                         \
 327 done;                                                                   \
 328 printf "%08x\n" $$dec_size |                                            \
 329         sed 's/\(..\)/\1 /g' | {                                        \
 330                 read ch0 ch1 ch2 ch3;                                   \
 331                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 332                         printf '%s%03o' '\\' $$((0x$$ch));              \
 333                 done;                                                   \
 334         }                                                               \
 335 )
 336
 337 quiet_cmd_bzip2 = BZIP2   $@
 338 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 339         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 340         (rm -f $@ ; false)
 341
 342 # Lzma
 343 # ---------------------------------------------------------------------------
 344
 345 quiet_cmd_lzma = LZMA    $@
 346 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 347         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 348         (rm -f $@ ; false)
 349
 350 quiet_cmd_lzo = LZO     $@
 351 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 352         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 353         (rm -f $@ ; false)
 354
 355 quiet_cmd_lz4 = LZ4     $@
 356 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 357         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 358         (rm -f $@ ; false)
 359
 360 # U-Boot mkimage
 361 # ---------------------------------------------------------------------------
 362
 363 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 364
 365 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 366 # the number of overrides in arch makefiles
 367 UIMAGE_ARCH ?= $(SRCARCH)
 368 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 369 UIMAGE_OPTS-y ?=
 370 UIMAGE_TYPE ?= kernel
 371 UIMAGE_LOADADDR ?= arch_must_set_this
 372 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 373 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 374 UIMAGE_IN ?= $<
 375 UIMAGE_OUT ?= $@
 376
 377 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 378       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 379                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 380                         -T $(UIMAGE_TYPE) \
 381                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 382                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 383
 384 # XZ
 385 # ---------------------------------------------------------------------------
 386 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 387 #
 388 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 389 # of the kernel decompressor. A BCJ filter is used if it is available for
 390 # the target architecture. xzkern also appends uncompressed size of the data
 391 # using size_append. The .xz format has the size information available at
 392 # the end of the file too, but it's in more complex format and it's good to
 393 # avoid changing the part of the boot code that reads the uncompressed size.
 394 # Note that the bytes added by size_append will make the xz tool think that
 395 # the file is corrupt. This is expected.
 396 #
 397 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 398 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 399 # big dictionary would increase the memory usage too much in the multi-call
 400 # decompression mode. A BCJ filter isn't used either.
 401 quiet_cmd_xzkern = XZKERN  $@
 402 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 403         sh $(srctree)/scripts/xz_wrap.sh && \
 404         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 405         (rm -f $@ ; false)
 406
 407 quiet_cmd_xzmisc = XZMISC  $@
 408 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 409         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 410         (rm -f $@ ; false)