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 # flags that take effect in current and sub directories
   8 KBUILD_AFLAGS += $(subdir-asflags-y)
   9 KBUILD_CFLAGS += $(subdir-ccflags-y)
  10
  11 # Figure out what we need to build from the various variables
  12 # ===========================================================================
  13
  14 # When an object is listed to be built compiled-in and modular,
  15 # only build the compiled-in version
  16 obj-m := $(filter-out $(obj-y),$(obj-m))
  17
  18 # Libraries are always collected in one lib file.
  19 # Filter out objects already built-in
  20 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  21
  22 # Determine modorder.
  23 # Unfortunately, we don't have information about ordering between -y
  24 # and -m subdirs.  Just put -y's first.
  25 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  26
  27 # Handle objects in subdirs
  28 # ---------------------------------------------------------------------------
  29 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
  30 #   and add the directory to the list of dirs to descend into: $(subdir-y)
  31 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
  32 #   and add the directory to the list of dirs to descend into: $(subdir-m)
  33 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  34 subdir-y        += $(__subdir-y)
  35 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  36 subdir-m        += $(__subdir-m)
  37 obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  38 obj-m           := $(filter-out %/, $(obj-m))
  39
  40 # Subdirectories we need to descend into
  41 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  42
  43 # if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
  44 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  45 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
  46 multi-used   := $(multi-used-y) $(multi-used-m)
  47 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
  48
  49 # Build list of the parts of our composite objects, our composite
  50 # objects depend on those (obviously)
  51 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  52 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  53 multi-objs   := $(multi-objs-y) $(multi-objs-m)
  54
  55 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  56 # tell kbuild to descend
  57 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  58
  59 # $(obj-dirs) is a list of directories that contain object files
  60 obj-dirs := $(dir $(multi-objs) $(obj-y))
  61
  62 # Replace multi-part objects by their individual parts, look at local dir only
  63 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)
  64 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)))
  65
  66 # Add subdir path
  67
  68 extra-y         := $(addprefix $(obj)/,$(extra-y))
  69 always          := $(addprefix $(obj)/,$(always))
  70 targets         := $(addprefix $(obj)/,$(targets))
  71 modorder        := $(addprefix $(obj)/,$(modorder))
  72 obj-y           := $(addprefix $(obj)/,$(obj-y))
  73 obj-m           := $(addprefix $(obj)/,$(obj-m))
  74 lib-y           := $(addprefix $(obj)/,$(lib-y))
  75 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  76 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  77 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  78 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  79 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  80 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  81 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  82 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  83 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  84 obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  85
  86 # These flags are needed for modversions and compiling, so we define them here
  87 # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
  88 # end up in (or would, if it gets compiled in)
  89 # Note: Files that end up in two or more modules are compiled without the
  90 #       KBUILD_MODNAME definition. The reason is that any made-up name would
  91 #       differ in different configs.
  92 name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
  93 basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
  94 modname_flags  = $(if $(filter 1,$(words $(modname))),\
  95                  -DKBUILD_MODNAME=$(call name-fix,$(modname)))
  96
  97 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
  98                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
  99 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 100 orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
 101                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 102 _a_flags       = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
 103 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 104
 105 #
 106 # Enable gcov profiling flags for a file, directory or for all files depending
 107 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 108 # (in this order)
 109 #
 110 ifeq ($(CONFIG_GCOV_KERNEL),y)
 111 _c_flags += $(if $(patsubst n%,, \
 112                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 113                 $(CFLAGS_GCOV))
 114 endif
 115
 116 #
 117 # Enable address sanitizer flags for kernel except some files or directories
 118 # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
 119 #
 120 ifeq ($(CONFIG_KASAN),y)
 121 _c_flags += $(if $(patsubst n%,, \
 122                 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
 123                 $(CFLAGS_KASAN))
 124 endif
 125
 126 ifeq ($(CONFIG_UBSAN),y)
 127 _c_flags += $(if $(patsubst n%,, \
 128                 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
 129                 $(CFLAGS_UBSAN))
 130 endif
 131
 132 ifeq ($(CONFIG_KCOV),y)
 133 _c_flags += $(if $(patsubst n%,, \
 134         $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
 135         $(CFLAGS_KCOV))
 136 endif
 137
 138 # If building the kernel in a separate objtree expand all occurrences
 139 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 140
 141 ifeq ($(KBUILD_SRC),)
 142 __c_flags       = $(_c_flags)
 143 __a_flags       = $(_a_flags)
 144 __cpp_flags     = $(_cpp_flags)
 145 else
 146
 147 # -I$(obj) locates generated .h files
 148 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 149 #   and locates generated .h files
 150 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 151 __c_flags       = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
 152                   $(call flags,_c_flags)
 153 __a_flags       = $(call flags,_a_flags)
 154 __cpp_flags     = $(call flags,_cpp_flags)
 155 endif
 156
 157 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 158                  $(__c_flags) $(modkern_cflags)                           \
 159                  $(basename_flags) $(modname_flags)
 160
 161 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 162                  $(__a_flags) $(modkern_aflags)
 163
 164 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 165                  $(__cpp_flags)
 166
 167 ld_flags       = $(LDFLAGS) $(ldflags-y)
 168
 169 DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes
 170
 171 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 172                  $(addprefix -I,$(DTC_INCLUDE))                          \
 173                  -undef -D__DTS__
 174
 175 # Finds the multi-part object the current object will be linked into
 176 modname-multi = $(sort $(foreach m,$(multi-used),\
 177                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 178
 179 # Useful for describing the dependency of composite objects
 180 # Usage:
 181 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
 182 define multi_depend
 183 $(foreach m, $(notdir $1), \
 184         $(eval $(obj)/$m: \
 185         $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
 186 endef
 187
 188 ifdef REGENERATE_PARSERS
 189
 190 # LEX
 191 # ---------------------------------------------------------------------------
 192 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 193
 194 quiet_cmd_flex = LEX     $@
 195       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 196
 197 .PRECIOUS: $(src)/%.lex.c_shipped
 198 $(src)/%.lex.c_shipped: $(src)/%.l
 199         $(call cmd,flex)
 200
 201 # YACC
 202 # ---------------------------------------------------------------------------
 203 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 204
 205 quiet_cmd_bison = YACC    $@
 206       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 207
 208 .PRECIOUS: $(src)/%.tab.c_shipped
 209 $(src)/%.tab.c_shipped: $(src)/%.y
 210         $(call cmd,bison)
 211
 212 quiet_cmd_bison_h = YACC    $@
 213       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 214
 215 .PRECIOUS: $(src)/%.tab.h_shipped
 216 $(src)/%.tab.h_shipped: $(src)/%.y
 217         $(call cmd,bison_h)
 218
 219 endif
 220
 221 # Shipped files
 222 # ===========================================================================
 223
 224 quiet_cmd_shipped = SHIPPED $@
 225 cmd_shipped = cat $< > $@
 226
 227 $(obj)/%: $(src)/%_shipped
 228         $(call cmd,shipped)
 229
 230 # Commands useful for building a boot image
 231 # ===========================================================================
 232 #
 233 #       Use as following:
 234 #
 235 #       target: source(s) FORCE
 236 #               $(if_changed,ld/objcopy/gzip)
 237 #
 238 #       and add target to extra-y so that we know we have to
 239 #       read in the saved command line
 240
 241 # Linking
 242 # ---------------------------------------------------------------------------
 243
 244 quiet_cmd_ld = LD      $@
 245 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 246                $(filter-out FORCE,$^) -o $@
 247
 248 # Objcopy
 249 # ---------------------------------------------------------------------------
 250
 251 quiet_cmd_objcopy = OBJCOPY $@
 252 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 253
 254 # Gzip
 255 # ---------------------------------------------------------------------------
 256
 257 quiet_cmd_gzip = GZIP    $@
 258 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 259         (rm -f $@ ; false)
 260
 261 # DTC
 262 # ---------------------------------------------------------------------------
 263 DTC ?= $(objtree)/scripts/dtc/dtc
 264
 265 # Disable noisy checks by default
 266 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
 267 DTC_FLAGS += -Wno-unit_address_vs_reg \
 268         -Wno-simple_bus_reg \
 269         -Wno-unit_address_format \
 270         -Wno-pci_bridge \
 271         -Wno-pci_device_bus_num \
 272         -Wno-pci_device_reg
 273 endif
 274
 275 ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
 276 DTC_FLAGS += -Wnode_name_chars_strict \
 277         -Wproperty_name_chars_strict
 278 endif
 279
 280 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
 281
 282 # Generate an assembly file to wrap the output of the device tree compiler
 283 quiet_cmd_dt_S_dtb= DTB     $@
 284 cmd_dt_S_dtb=                                           \
 285 (                                                       \
 286         echo '\#include <asm-generic/vmlinux.lds.h>';   \
 287         echo '.section .dtb.init.rodata,"a"';           \
 288         echo '.balign STRUCT_ALIGNMENT';                \
 289         echo '.global __dtb_$(*F)_begin';               \
 290         echo '__dtb_$(*F)_begin:';                      \
 291         echo '.incbin "$<" ';                           \
 292         echo '__dtb_$(*F)_end:';                        \
 293         echo '.global __dtb_$(*F)_end';                 \
 294         echo '.balign STRUCT_ALIGNMENT';                \
 295 ) > $@
 296
 297 $(obj)/%.dtb.S: $(obj)/%.dtb
 298         $(call cmd,dt_S_dtb)
 299
 300 quiet_cmd_dtc = DTC     $@
 301 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 302         $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
 303         $(DTC) -O dtb -o $@ -b 0 \
 304                 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 305                 -d $(depfile).dtc.tmp $(dtc-tmp) ; \
 306         cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
 307
 308 $(obj)/%.dtb: $(src)/%.dts FORCE
 309         $(call if_changed_dep,dtc)
 310
 311 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 312
 313 # Bzip2
 314 # ---------------------------------------------------------------------------
 315
 316 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 317 # append the size as a 32-bit littleendian number as gzip does.
 318 size_append = printf $(shell                                            \
 319 dec_size=0;                                                             \
 320 for F in $1; do                                                         \
 321         fsize=$$(stat -c "%s" $$F);                                     \
 322         dec_size=$$(expr $$dec_size + $$fsize);                         \
 323 done;                                                                   \
 324 printf "%08x\n" $$dec_size |                                            \
 325         sed 's/\(..\)/\1 /g' | {                                        \
 326                 read ch0 ch1 ch2 ch3;                                   \
 327                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 328                         printf '%s%03o' '\\' $$((0x$$ch));              \
 329                 done;                                                   \
 330         }                                                               \
 331 )
 332
 333 quiet_cmd_bzip2 = BZIP2   $@
 334 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 335         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 336         (rm -f $@ ; false)
 337
 338 # Lzma
 339 # ---------------------------------------------------------------------------
 340
 341 quiet_cmd_lzma = LZMA    $@
 342 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 343         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 344         (rm -f $@ ; false)
 345
 346 quiet_cmd_lzo = LZO     $@
 347 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 348         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 349         (rm -f $@ ; false)
 350
 351 quiet_cmd_lz4 = LZ4     $@
 352 cmd_lz4 = (cat $(filter-out FORCE,$^) | \
 353         lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 354         (rm -f $@ ; false)
 355
 356 # U-Boot mkimage
 357 # ---------------------------------------------------------------------------
 358
 359 MKIMAGE := $(srctree)/scripts/mkuboot.sh
 360
 361 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
 362 # the number of overrides in arch makefiles
 363 UIMAGE_ARCH ?= $(SRCARCH)
 364 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
 365 UIMAGE_OPTS-y ?=
 366 UIMAGE_TYPE ?= kernel
 367 UIMAGE_LOADADDR ?= arch_must_set_this
 368 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 369 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 370 UIMAGE_IN ?= $<
 371 UIMAGE_OUT ?= $@
 372
 373 quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
 374       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
 375                         -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
 376                         -T $(UIMAGE_TYPE) \
 377                         -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
 378                         -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
 379
 380 # XZ
 381 # ---------------------------------------------------------------------------
 382 # Use xzkern to compress the kernel image and xzmisc to compress other things.
 383 #
 384 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 385 # of the kernel decompressor. A BCJ filter is used if it is available for
 386 # the target architecture. xzkern also appends uncompressed size of the data
 387 # using size_append. The .xz format has the size information available at
 388 # the end of the file too, but it's in more complex format and it's good to
 389 # avoid changing the part of the boot code that reads the uncompressed size.
 390 # Note that the bytes added by size_append will make the xz tool think that
 391 # the file is corrupt. This is expected.
 392 #
 393 # xzmisc doesn't use size_append, so it can be used to create normal .xz
 394 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 395 # big dictionary would increase the memory usage too much in the multi-call
 396 # decompression mode. A BCJ filter isn't used either.
 397 quiet_cmd_xzkern = XZKERN  $@
 398 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 399         sh $(srctree)/scripts/xz_wrap.sh && \
 400         $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 401         (rm -f $@ ; false)
 402
 403 quiet_cmd_xzmisc = XZMISC  $@
 404 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 405         xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 406         (rm -f $@ ; false)
 407
 408 # ASM offsets
 409 # ---------------------------------------------------------------------------
 410
 411 # Default sed regexp - multiline due to syntax constraints
 412 #
 413 # Use [:space:] because LLVM's integrated assembler inserts <tab> around
 414 # the .ascii directive whereas GCC keeps the <space> as-is.
 415 define sed-offsets
 416         's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
 417         /^->/{s:->#\(.*\):/* \1 */:; \
 418         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
 419         s:->::; p;}'
 420 endef
 421
 422 # Use filechk to avoid rebuilds when a header changes, but the resulting file
 423 # does not
 424 define filechk_offsets
 425         (set -e; \
 426          echo "#ifndef $2"; \
 427          echo "#define $2"; \
 428          echo "/*"; \
 429          echo " * DO NOT MODIFY."; \
 430          echo " *"; \
 431          echo " * This file was generated by Kbuild"; \
 432          echo " */"; \
 433          echo ""; \
 434          sed -ne $(sed-offsets); \
 435          echo ""; \
 436          echo "#endif" )
 437 endef