| 1 | # SPDX-License-Identifier: GPL-2.0
|
| 2 | # ==========================================================================
|
| 3 | # Building
|
| 4 | # ==========================================================================
|
| 5 |
|
| 6 | src := $(obj)
|
| 7 |
|
| 8 | PHONY := __build
|
| 9 | __build:
|
| 10 |
|
| 11 | # Init all relevant variables used in kbuild files so
|
| 12 | # 1) they have correct type
|
| 13 | # 2) they do not inherit any value from the environment
|
| 14 | obj-y :=
|
| 15 | obj-m :=
|
| 16 | lib-y :=
|
| 17 | lib-m :=
|
| 18 | always-y :=
|
| 19 | always-m :=
|
| 20 | targets :=
|
| 21 | subdir-y :=
|
| 22 | subdir-m :=
|
| 23 | EXTRA_AFLAGS :=
|
| 24 | EXTRA_CFLAGS :=
|
| 25 | EXTRA_CPPFLAGS :=
|
| 26 | EXTRA_LDFLAGS :=
|
| 27 | asflags-y :=
|
| 28 | ccflags-y :=
|
| 29 | cppflags-y :=
|
| 30 | ldflags-y :=
|
| 31 |
|
| 32 | subdir-asflags-y :=
|
| 33 | subdir-ccflags-y :=
|
| 34 |
|
| 35 | # Read auto.conf if it exists, otherwise ignore
|
| 36 | -include include/config/auto.conf
|
| 37 |
|
| 38 | include $(srctree)/scripts/Kbuild.include
|
| 39 | include $(srctree)/scripts/Makefile.compiler
|
| 40 |
|
| 41 | # The filename Kbuild has precedence over Makefile
|
| 42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
|
| 43 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
|
| 44 | include $(kbuild-file)
|
| 45 |
|
| 46 | include $(srctree)/scripts/Makefile.lib
|
| 47 |
|
| 48 | # Do not include hostprogs rules unless needed.
|
| 49 | # $(sort ...) is used here to remove duplicated words and excessive spaces.
|
| 50 | hostprogs := $(sort $(hostprogs))
|
| 51 | ifneq ($(hostprogs),)
|
| 52 | include $(srctree)/scripts/Makefile.host
|
| 53 | endif
|
| 54 |
|
| 55 | # Do not include userprogs rules unless needed.
|
| 56 | # $(sort ...) is used here to remove duplicated words and excessive spaces.
|
| 57 | userprogs := $(sort $(userprogs))
|
| 58 | ifneq ($(userprogs),)
|
| 59 | include $(srctree)/scripts/Makefile.userprogs
|
| 60 | endif
|
| 61 |
|
| 62 | ifndef obj
|
| 63 | $(warning kbuild: Makefile.build is included improperly)
|
| 64 | endif
|
| 65 |
|
| 66 | ifeq ($(need-modorder),)
|
| 67 | ifneq ($(obj-m),)
|
| 68 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
|
| 69 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
|
| 70 | endif
|
| 71 | endif
|
| 72 |
|
| 73 | # ===========================================================================
|
| 74 |
|
| 75 | # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
|
| 76 | subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
|
| 77 | subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
|
| 78 |
|
| 79 | targets-for-builtin := $(extra-y)
|
| 80 |
|
| 81 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
|
| 82 | targets-for-builtin += $(obj)/lib.a
|
| 83 | endif
|
| 84 |
|
| 85 | ifdef need-builtin
|
| 86 | targets-for-builtin += $(obj)/built-in.a
|
| 87 | endif
|
| 88 |
|
| 89 | targets-for-modules := $(patsubst %.o, %.mod, $(filter %.o, $(obj-m)))
|
| 90 |
|
| 91 | ifdef CONFIG_LTO_CLANG
|
| 92 | targets-for-modules += $(patsubst %.o, %.lto.o, $(filter %.o, $(obj-m)))
|
| 93 | endif
|
| 94 |
|
| 95 | ifdef need-modorder
|
| 96 | targets-for-modules += $(obj)/modules.order
|
| 97 | endif
|
| 98 |
|
| 99 | targets += $(targets-for-builtin) $(targets-for-modules)
|
| 100 |
|
| 101 | # Linus' kernel sanity checking tool
|
| 102 | ifeq ($(KBUILD_CHECKSRC),1)
|
| 103 | quiet_cmd_checksrc = CHECK $<
|
| 104 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
|
| 105 | else ifeq ($(KBUILD_CHECKSRC),2)
|
| 106 | quiet_cmd_force_checksrc = CHECK $<
|
| 107 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
|
| 108 | endif
|
| 109 |
|
| 110 | ifneq ($(KBUILD_EXTRA_WARN),)
|
| 111 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
|
| 112 | endif
|
| 113 |
|
| 114 | # Compile C sources (.c)
|
| 115 | # ---------------------------------------------------------------------------
|
| 116 |
|
| 117 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
| 118 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
|
| 119 |
|
| 120 | $(obj)/%.s: $(src)/%.c FORCE
|
| 121 | $(call if_changed_dep,cc_s_c)
|
| 122 |
|
| 123 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
|
| 124 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
|
| 125 |
|
| 126 | $(obj)/%.i: $(src)/%.c FORCE
|
| 127 | $(call if_changed_dep,cpp_i_c)
|
| 128 |
|
| 129 | # These mirror gensymtypes_S and co below, keep them in synch.
|
| 130 | cmd_gensymtypes_c = \
|
| 131 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
|
| 132 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \
|
| 133 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
| 134 | $(if $(KBUILD_PRESERVE),-p) \
|
| 135 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
| 136 |
|
| 137 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
|
| 138 | cmd_cc_symtypes_c = \
|
| 139 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
|
| 140 | test -s $@ || rm -f $@
|
| 141 |
|
| 142 | $(obj)/%.symtypes : $(src)/%.c FORCE
|
| 143 | $(call cmd,cc_symtypes_c)
|
| 144 |
|
| 145 | # LLVM assembly
|
| 146 | # Generate .ll files from .c
|
| 147 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
|
| 148 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
|
| 149 |
|
| 150 | $(obj)/%.ll: $(src)/%.c FORCE
|
| 151 | $(call if_changed_dep,cc_ll_c)
|
| 152 |
|
| 153 | # C (.c) files
|
| 154 | # The C file is compiled and updated dependency information is generated.
|
| 155 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
|
| 156 |
|
| 157 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
|
| 158 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
|
| 159 |
|
| 160 | ifdef CONFIG_MODVERSIONS
|
| 161 | # When module versioning is enabled the following steps are executed:
|
| 162 | # o compile a <file>.o from <file>.c
|
| 163 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does
|
| 164 | # not export symbols, it's done.
|
| 165 | # o otherwise, we calculate symbol versions using the good old
|
| 166 | # genksyms on the preprocessed source and postprocess them in a way
|
| 167 | # that they are usable as a linker script
|
| 168 | # o generate .tmp_<file>.o from <file>.o using the linker to
|
| 169 | # replace the unresolved symbols __crc_exported_symbol with
|
| 170 | # the actual value of the checksum generated by genksyms
|
| 171 | # o remove .tmp_<file>.o to <file>.o
|
| 172 |
|
| 173 | ifdef CONFIG_LTO_CLANG
|
| 174 | # Generate .o.symversions files for each .o with exported symbols, and link these
|
| 175 | # to the kernel and/or modules at the end.
|
| 176 | cmd_modversions_c = \
|
| 177 | if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
|
| 178 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
| 179 | > [email protected]; \
|
| 180 | else \
|
| 181 | rm -f [email protected]; \
|
| 182 | fi;
|
| 183 | else
|
| 184 | cmd_modversions_c = \
|
| 185 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
|
| 186 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
| 187 | > $(@D)/.tmp_$(@F:.o=.ver); \
|
| 188 | \
|
| 189 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
|
| 190 | -T $(@D)/.tmp_$(@F:.o=.ver); \
|
| 191 | mv -f $(@D)/.tmp_$(@F) $@; \
|
| 192 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \
|
| 193 | fi
|
| 194 | endif
|
| 195 | endif
|
| 196 |
|
| 197 | ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
| 198 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
|
| 199 | ifdef BUILD_C_RECORDMCOUNT
|
| 200 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
|
| 201 | RECORDMCOUNT_FLAGS = -w
|
| 202 | endif
|
| 203 | # Due to recursion, we must skip empty.o.
|
| 204 | # The empty.o file is created in the make process in order to determine
|
| 205 | # the target endianness and word size. It is made before all other C
|
| 206 | # files, including recordmcount.
|
| 207 | sub_cmd_record_mcount = \
|
| 208 | if [ $(@) != "scripts/mod/empty.o" ]; then \
|
| 209 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
|
| 210 | fi;
|
| 211 | recordmcount_source := $(srctree)/scripts/recordmcount.c \
|
| 212 | $(srctree)/scripts/recordmcount.h
|
| 213 | else
|
| 214 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
|
| 215 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
|
| 216 | "$(if $(CONFIG_64BIT),64,32)" \
|
| 217 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
|
| 218 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
|
| 219 | "$(if $(part-of-module),1,0)" "$(@)";
|
| 220 | recordmcount_source := $(srctree)/scripts/recordmcount.pl
|
| 221 | endif # BUILD_C_RECORDMCOUNT
|
| 222 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
|
| 223 | $(sub_cmd_record_mcount))
|
| 224 | endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
|
| 225 |
|
| 226 | ifdef CONFIG_STACK_VALIDATION
|
| 227 | ifndef CONFIG_LTO_CLANG
|
| 228 |
|
| 229 | __objtool_obj := $(objtree)/tools/objtool/objtool
|
| 230 |
|
| 231 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
|
| 232 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
|
| 233 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
|
| 234 | cmd_objtool = $(if $(patsubst y%,, \
|
| 235 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
| 236 | $(__objtool_obj) $(objtool_args) $@)
|
| 237 | objtool_obj = $(if $(patsubst y%,, \
|
| 238 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
| 239 | $(__objtool_obj))
|
| 240 |
|
| 241 | endif # CONFIG_LTO_CLANG
|
| 242 | endif # CONFIG_STACK_VALIDATION
|
| 243 |
|
| 244 | # Rebuild all objects when objtool changes, or is enabled/disabled.
|
| 245 | objtool_dep = $(objtool_obj) \
|
| 246 | $(wildcard include/config/ORC_UNWINDER \
|
| 247 | include/config/STACK_VALIDATION)
|
| 248 |
|
| 249 | ifdef CONFIG_TRIM_UNUSED_KSYMS
|
| 250 | cmd_gen_ksymdeps = \
|
| 251 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
|
| 252 |
|
| 253 | # List module undefined symbols
|
| 254 | undefined_syms = $(NM) $< | $(AWK) '$$1 == "U" { printf("%s%s", x++ ? " " : "", $$2) }';
|
| 255 | endif
|
| 256 |
|
| 257 | define rule_cc_o_c
|
| 258 | $(call cmd_and_fixdep,cc_o_c)
|
| 259 | $(call cmd,gen_ksymdeps)
|
| 260 | $(call cmd,checksrc)
|
| 261 | $(call cmd,checkdoc)
|
| 262 | $(call cmd,objtool)
|
| 263 | $(call cmd,modversions_c)
|
| 264 | $(call cmd,record_mcount)
|
| 265 | endef
|
| 266 |
|
| 267 | define rule_as_o_S
|
| 268 | $(call cmd_and_fixdep,as_o_S)
|
| 269 | $(call cmd,gen_ksymdeps)
|
| 270 | $(call cmd,objtool)
|
| 271 | $(call cmd,modversions_S)
|
| 272 | endef
|
| 273 |
|
| 274 | # Built-in and composite module parts
|
| 275 | .SECONDEXPANSION:
|
| 276 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $$(objtool_dep) FORCE
|
| 277 | $(call if_changed_rule,cc_o_c)
|
| 278 | $(call cmd,force_checksrc)
|
| 279 |
|
| 280 | ifdef CONFIG_LTO_CLANG
|
| 281 | # Module .o files may contain LLVM bitcode, compile them into native code
|
| 282 | # before ELF processing
|
| 283 | quiet_cmd_cc_lto_link_modules = LTO [M] $@
|
| 284 | cmd_cc_lto_link_modules = \
|
| 285 | $(LD) $(ld_flags) -r -o $@ \
|
| 286 | $(shell [ -s $(@:.lto.o=.o.symversions) ] && \
|
| 287 | echo -T $(@:.lto.o=.o.symversions)) \
|
| 288 | --whole-archive $(filter-out FORCE,$^)
|
| 289 |
|
| 290 | ifdef CONFIG_STACK_VALIDATION
|
| 291 | # objtool was skipped for LLVM bitcode, run it now that we have compiled
|
| 292 | # modules into native code
|
| 293 | cmd_cc_lto_link_modules += ; \
|
| 294 | $(objtree)/tools/objtool/objtool $(objtool_args) --module $@
|
| 295 | endif
|
| 296 |
|
| 297 | $(obj)/%.lto.o: $(obj)/%.o FORCE
|
| 298 | $(call if_changed,cc_lto_link_modules)
|
| 299 | endif
|
| 300 |
|
| 301 | cmd_mod = { \
|
| 302 | echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
|
| 303 | $(undefined_syms) echo; \
|
| 304 | } > $@
|
| 305 |
|
| 306 | $(obj)/%.mod: $(obj)/%$(mod-prelink-ext).o FORCE
|
| 307 | $(call if_changed,mod)
|
| 308 |
|
| 309 | quiet_cmd_cc_lst_c = MKLST $@
|
| 310 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
|
| 311 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
|
| 312 | System.map $(OBJDUMP) > $@
|
| 313 |
|
| 314 | $(obj)/%.lst: $(src)/%.c FORCE
|
| 315 | $(call if_changed_dep,cc_lst_c)
|
| 316 |
|
| 317 | # Compile assembler sources (.S)
|
| 318 | # ---------------------------------------------------------------------------
|
| 319 |
|
| 320 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
|
| 321 | # or a file that it includes, in order to get versioned symbols. We build a
|
| 322 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
|
| 323 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
|
| 324 | #
|
| 325 | # This is convoluted. The .S file must first be preprocessed to run guards and
|
| 326 | # expand names, then the resulting exports must be constructed into plain
|
| 327 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
|
| 328 | # to make the genksyms input.
|
| 329 | #
|
| 330 | # These mirror gensymtypes_c and co above, keep them in synch.
|
| 331 | cmd_gensymtypes_S = \
|
| 332 | { echo "\#include <linux/kernel.h>" ; \
|
| 333 | echo "\#include <asm/asm-prototypes.h>" ; \
|
| 334 | $(CPP) $(a_flags) $< | \
|
| 335 | grep "\<___EXPORT_SYMBOL\>" | \
|
| 336 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
|
| 337 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
|
| 338 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \
|
| 339 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
| 340 | $(if $(KBUILD_PRESERVE),-p) \
|
| 341 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
| 342 |
|
| 343 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
|
| 344 | cmd_cc_symtypes_S = \
|
| 345 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
|
| 346 | test -s $@ || rm -f $@
|
| 347 |
|
| 348 | $(obj)/%.symtypes : $(src)/%.S FORCE
|
| 349 | $(call cmd,cc_symtypes_S)
|
| 350 |
|
| 351 |
|
| 352 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
|
| 353 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
|
| 354 |
|
| 355 | $(obj)/%.s: $(src)/%.S FORCE
|
| 356 | $(call if_changed_dep,cpp_s_S)
|
| 357 |
|
| 358 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
|
| 359 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
| 360 |
|
| 361 | ifdef CONFIG_ASM_MODVERSIONS
|
| 362 |
|
| 363 | # versioning matches the C process described above, with difference that
|
| 364 | # we parse asm-prototypes.h C header to get function definitions.
|
| 365 |
|
| 366 | cmd_modversions_S = \
|
| 367 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
|
| 368 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
| 369 | > $(@D)/.tmp_$(@F:.o=.ver); \
|
| 370 | \
|
| 371 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
|
| 372 | -T $(@D)/.tmp_$(@F:.o=.ver); \
|
| 373 | mv -f $(@D)/.tmp_$(@F) $@; \
|
| 374 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \
|
| 375 | fi
|
| 376 | endif
|
| 377 |
|
| 378 | $(obj)/%.o: $(src)/%.S $$(objtool_dep) FORCE
|
| 379 | $(call if_changed_rule,as_o_S)
|
| 380 |
|
| 381 | targets += $(filter-out $(subdir-builtin), $(real-obj-y))
|
| 382 | targets += $(filter-out $(subdir-modorder), $(real-obj-m))
|
| 383 | targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
|
| 384 |
|
| 385 | # Linker scripts preprocessor (.lds.S -> .lds)
|
| 386 | # ---------------------------------------------------------------------------
|
| 387 | quiet_cmd_cpp_lds_S = LDS $@
|
| 388 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
|
| 389 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
|
| 390 |
|
| 391 | $(obj)/%.lds: $(src)/%.lds.S FORCE
|
| 392 | $(call if_changed_dep,cpp_lds_S)
|
| 393 |
|
| 394 | # ASN.1 grammar
|
| 395 | # ---------------------------------------------------------------------------
|
| 396 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
|
| 397 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
|
| 398 | $(basename $@).c $(basename $@).h
|
| 399 |
|
| 400 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
|
| 401 | $(call cmd,asn1_compiler)
|
| 402 |
|
| 403 | # Build the compiled-in targets
|
| 404 | # ---------------------------------------------------------------------------
|
| 405 |
|
| 406 | # To build objects in subdirs, we need to descend into the directories
|
| 407 | $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
|
| 408 | $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
|
| 409 |
|
| 410 | # combine symversions for later processing
|
| 411 | ifeq ($(CONFIG_LTO_CLANG) $(CONFIG_MODVERSIONS),y y)
|
| 412 | cmd_update_lto_symversions = \
|
| 413 | rm -f [email protected] \
|
| 414 | $(foreach n, $(filter-out FORCE,$^), \
|
| 415 | $(if $(shell test -s $(n).symversions && echo y), \
|
| 416 | ; cat $(n).symversions >> [email protected]))
|
| 417 | else
|
| 418 | cmd_update_lto_symversions = echo >/dev/null
|
| 419 | endif
|
| 420 |
|
| 421 | #
|
| 422 | # Rule to compile a set of .o files into one .a file (without symbol table)
|
| 423 | #
|
| 424 |
|
| 425 | quiet_cmd_ar_builtin = AR $@
|
| 426 | cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
|
| 427 |
|
| 428 | quiet_cmd_ar_and_symver = AR $@
|
| 429 | cmd_ar_and_symver = $(cmd_update_lto_symversions); $(cmd_ar_builtin)
|
| 430 |
|
| 431 | $(obj)/built-in.a: $(real-obj-y) FORCE
|
| 432 | $(call if_changed,ar_and_symver)
|
| 433 |
|
| 434 | #
|
| 435 | # Rule to create modules.order file
|
| 436 | #
|
| 437 | # Create commands to either record .ko file or cat modules.order from
|
| 438 | # a subdirectory
|
| 439 | # Add $(obj-m) as the prerequisite to avoid updating the timestamp of
|
| 440 | # modules.order unless contained modules are updated.
|
| 441 |
|
| 442 | cmd_modules_order = { $(foreach m, $(real-prereqs), \
|
| 443 | $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
|
| 444 | | $(AWK) '!x[$$0]++' - > $@
|
| 445 |
|
| 446 | $(obj)/modules.order: $(obj-m) FORCE
|
| 447 | $(call if_changed,modules_order)
|
| 448 |
|
| 449 | #
|
| 450 | # Rule to compile a set of .o files into one .a file (with symbol table)
|
| 451 | #
|
| 452 | quiet_cmd_ar_lib = AR $@
|
| 453 | cmd_ar_lib = $(cmd_update_lto_symversions); $(cmd_ar)
|
| 454 |
|
| 455 | $(obj)/lib.a: $(lib-y) FORCE
|
| 456 | $(call if_changed,ar_lib)
|
| 457 |
|
| 458 | # NOTE:
|
| 459 | # Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
|
| 460 | # module is turned into a multi object module, $^ will contain header file
|
| 461 | # dependencies recorded in the .*.cmd file.
|
| 462 | ifdef CONFIG_LTO_CLANG
|
| 463 | quiet_cmd_link_multi-m = AR [M] $@
|
| 464 | cmd_link_multi-m = \
|
| 465 | $(cmd_update_lto_symversions); \
|
| 466 | rm -f $@; \
|
| 467 | $(AR) cDPrsT $@ $(filter %.o,$^)
|
| 468 | else
|
| 469 | quiet_cmd_link_multi-m = LD [M] $@
|
| 470 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
|
| 471 | endif
|
| 472 |
|
| 473 | $(multi-obj-m): FORCE
|
| 474 | $(call if_changed,link_multi-m)
|
| 475 | $(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
|
| 476 |
|
| 477 | targets += $(multi-obj-m)
|
| 478 | targets := $(filter-out $(PHONY), $(targets))
|
| 479 |
|
| 480 | # Add intermediate targets:
|
| 481 | # When building objects with specific suffix patterns, add intermediate
|
| 482 | # targets that the final targets are derived from.
|
| 483 | intermediate_targets = $(foreach sfx, $(2), \
|
| 484 | $(patsubst %$(strip $(1)),%$(sfx), \
|
| 485 | $(filter %$(strip $(1)), $(targets))))
|
| 486 | # %.asn1.o <- %.asn1.[ch] <- %.asn1
|
| 487 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
|
| 488 | # %.lex.o <- %.lex.c <- %.l
|
| 489 | # %.tab.o <- %.tab.[ch] <- %.y
|
| 490 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
|
| 491 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
|
| 492 | $(call intermediate_targets, .lex.o, .lex.c) \
|
| 493 | $(call intermediate_targets, .tab.o, .tab.c .tab.h)
|
| 494 |
|
| 495 | # Build
|
| 496 | # ---------------------------------------------------------------------------
|
| 497 |
|
| 498 | ifdef single-build
|
| 499 |
|
| 500 | KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
|
| 501 |
|
| 502 | curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
|
| 503 | $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
|
| 504 |
|
| 505 | # Handle single targets without any rule: show "Nothing to be done for ..." or
|
| 506 | # "No rule to make target ..." depending on whether the target exists.
|
| 507 | unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
|
| 508 | $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
|
| 509 |
|
| 510 | single-subdirs := $(foreach d, $(subdir-ym), \
|
| 511 | $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
|
| 512 |
|
| 513 | __build: $(curdir-single) $(single-subdirs)
|
| 514 | ifneq ($(unknown-single),)
|
| 515 | $(Q)$(MAKE) -f /dev/null $(unknown-single)
|
| 516 | endif
|
| 517 | @:
|
| 518 |
|
| 519 | ifeq ($(curdir-single),)
|
| 520 | # Nothing to do in this directory. Do not include any .*.cmd file for speed-up
|
| 521 | targets :=
|
| 522 | else
|
| 523 | targets += $(curdir-single)
|
| 524 | endif
|
| 525 |
|
| 526 | else
|
| 527 |
|
| 528 | __build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
|
| 529 | $(if $(KBUILD_MODULES), $(targets-for-modules)) \
|
| 530 | $(subdir-ym) $(always-y)
|
| 531 | @:
|
| 532 |
|
| 533 | endif
|
| 534 |
|
| 535 | # Descending
|
| 536 | # ---------------------------------------------------------------------------
|
| 537 |
|
| 538 | PHONY += $(subdir-ym)
|
| 539 | $(subdir-ym):
|
| 540 | $(Q)$(MAKE) $(build)=$@ \
|
| 541 | $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
|
| 542 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
|
| 543 | need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
|
| 544 |
|
| 545 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
| 546 | # ---------------------------------------------------------------------------
|
| 547 |
|
| 548 | PHONY += FORCE
|
| 549 |
|
| 550 | FORCE:
|
| 551 |
|
| 552 | # Read all saved command lines and dependencies for the $(targets) we
|
| 553 | # may be building above, using $(if_changed{,_dep}). As an
|
| 554 | # optimization, we don't need to read them if the target does not
|
| 555 | # exist, we will rebuild anyway in that case.
|
| 556 |
|
| 557 | existing-targets := $(wildcard $(sort $(targets)))
|
| 558 |
|
| 559 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
| 560 |
|
| 561 | # Create directories for object files if they do not exist
|
| 562 | obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
|
| 563 | # If targets exist, their directories apparently exist. Skip mkdir.
|
| 564 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
|
| 565 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
|
| 566 | ifneq ($(obj-dirs),)
|
| 567 | $(shell mkdir -p $(obj-dirs))
|
| 568 | endif
|
| 569 |
|
| 570 | .PHONY: $(PHONY)
|