| | 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 := |
| | 19 | targets := |
| | 20 | subdir-y := |
| | 21 | subdir-m := |
| | 22 | EXTRA_AFLAGS := |
| | 23 | EXTRA_CFLAGS := |
| | 24 | EXTRA_CPPFLAGS := |
| | 25 | EXTRA_LDFLAGS := |
| | 26 | asflags-y := |
| | 27 | ccflags-y := |
| | 28 | cppflags-y := |
| | 29 | ldflags-y := |
| | 30 | |
| | 31 | subdir-asflags-y := |
| | 32 | subdir-ccflags-y := |
| | 33 | |
| | 34 | # Read auto.conf if it exists, otherwise ignore |
| | 35 | -include include/config/auto.conf |
| | 36 | |
| | 37 | include scripts/Kbuild.include |
| | 38 | |
| | 39 | # For backward compatibility check that these variables do not change |
| | 40 | save-cflags := $(CFLAGS) |
| | 41 | |
| | 42 | # The filename Kbuild has precedence over Makefile |
| | 43 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
| | 44 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
| | 45 | include $(kbuild-file) |
| | 46 | |
| | 47 | # If the save-* variables changed error out |
| | 48 | ifeq ($(KBUILD_NOPEDANTIC),) |
| | 49 | ifneq ("$(save-cflags)","$(CFLAGS)") |
| | 50 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y) |
| | 51 | endif |
| | 52 | endif |
| | 53 | |
| | 54 | include scripts/Makefile.lib |
| | 55 | |
| | 56 | ifdef host-progs |
| | 57 | ifneq ($(hostprogs-y),$(host-progs)) |
| | 58 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
| | 59 | hostprogs-y += $(host-progs) |
| | 60 | endif |
| | 61 | endif |
| | 62 | |
| | 63 | # Do not include host rules unless needed |
| | 64 | ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),) |
| | 65 | include scripts/Makefile.host |
| | 66 | endif |
| | 67 | |
| | 68 | ifndef obj |
| | 69 | $(warning kbuild: Makefile.build is included improperly) |
| | 70 | endif |
| | 71 | |
| | 72 | # =========================================================================== |
| | 73 | |
| | 74 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),) |
| | 75 | lib-target := $(obj)/lib.a |
| | 76 | obj-y += $(obj)/lib-ksyms.o |
| | 77 | endif |
| | 78 | |
| | 79 | ifneq ($(strip $(obj-y) $(need-builtin)),) |
| | 80 | builtin-target := $(obj)/built-in.o |
| | 81 | endif |
| | 82 | |
| | 83 | modorder-target := $(obj)/modules.order |
| | 84 | |
| | 85 | # We keep a list of all modules in $(MODVERDIR) |
| | 86 | |
| | 87 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ |
| | 88 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
| | 89 | $(subdir-ym) $(always) |
| | 90 | @: |
| | 91 | |
| | 92 | # Linus' kernel sanity checking tool |
| | 93 | ifneq ($(KBUILD_CHECKSRC),0) |
| | 94 | ifeq ($(KBUILD_CHECKSRC),2) |
| | 95 | quiet_cmd_force_checksrc = CHECK $< |
| | 96 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
| | 97 | else |
| | 98 | quiet_cmd_checksrc = CHECK $< |
| | 99 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ; |
| | 100 | endif |
| | 101 | endif |
| | 102 | |
| | 103 | ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) |
| | 104 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ; |
| | 105 | endif |
| | 106 | |
| | 107 | # Do section mismatch analysis for each module/built-in.o |
| | 108 | ifdef CONFIG_DEBUG_SECTION_MISMATCH |
| | 109 | cmd_secanalysis = ; scripts/mod/modpost $@ |
| | 110 | endif |
| | 111 | |
| | 112 | # Compile C sources (.c) |
| | 113 | # --------------------------------------------------------------------------- |
| | 114 | |
| | 115 | # Default is built-in, unless we know otherwise |
| | 116 | modkern_cflags = \ |
| | 117 | $(if $(part-of-module), \ |
| | 118 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ |
| | 119 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL)) |
| | 120 | quiet_modtag := $(empty) $(empty) |
| | 121 | |
| | 122 | $(real-objs-m) : part-of-module := y |
| | 123 | $(real-objs-m:.o=.i) : part-of-module := y |
| | 124 | $(real-objs-m:.o=.s) : part-of-module := y |
| | 125 | $(real-objs-m:.o=.lst): part-of-module := y |
| | 126 | |
| | 127 | $(real-objs-m) : quiet_modtag := [M] |
| | 128 | $(real-objs-m:.o=.i) : quiet_modtag := [M] |
| | 129 | $(real-objs-m:.o=.s) : quiet_modtag := [M] |
| | 130 | $(real-objs-m:.o=.lst): quiet_modtag := [M] |
| | 131 | |
| | 132 | $(obj-m) : quiet_modtag := [M] |
| | 133 | |
| | 134 | # Default for not multi-part modules |
| | 135 | modname = $(basetarget) |
| | 136 | |
| | 137 | $(multi-objs-m) : modname = $(modname-multi) |
| | 138 | $(multi-objs-m:.o=.i) : modname = $(modname-multi) |
| | 139 | $(multi-objs-m:.o=.s) : modname = $(modname-multi) |
| | 140 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi) |
| | 141 | $(multi-objs-y) : modname = $(modname-multi) |
| | 142 | $(multi-objs-y:.o=.i) : modname = $(modname-multi) |
| | 143 | $(multi-objs-y:.o=.s) : modname = $(modname-multi) |
| | 144 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi) |
| | 145 | |
| | 146 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
| | 147 | cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< |
| | 148 | |
| | 149 | $(obj)/%.s: $(src)/%.c FORCE |
| | 150 | $(call if_changed_dep,cc_s_c) |
| | 151 | |
| | 152 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@ |
| | 153 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $< |
| | 154 | |
| | 155 | $(obj)/%.i: $(src)/%.c FORCE |
| | 156 | $(call if_changed_dep,cpp_i_c) |
| | 157 | |
| | 158 | # These mirror gensymtypes_S and co below, keep them in synch. |
| | 159 | cmd_gensymtypes_c = \ |
| | 160 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
| | 161 | $(GENKSYMS) $(if $(1), -T $(2)) \ |
| | 162 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ |
| | 163 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
| | 164 | $(if $(KBUILD_PRESERVE),-p) \ |
| | 165 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
| | 166 | |
| | 167 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
| | 168 | cmd_cc_symtypes_c = \ |
| | 169 | set -e; \ |
| | 170 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \ |
| | 171 | test -s $@ || rm -f $@ |
| | 172 | |
| | 173 | $(obj)/%.symtypes : $(src)/%.c FORCE |
| | 174 | $(call cmd,cc_symtypes_c) |
| | 175 | |
| | 176 | # LLVM assembly |
| | 177 | # Generate .ll files from .c |
| | 178 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ |
| | 179 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< |
| | 180 | |
| | 181 | $(obj)/%.ll: $(src)/%.c FORCE |
| | 182 | $(call if_changed_dep,cc_ll_c) |
| | 183 | |
| | 184 | # C (.c) files |
| | 185 | # The C file is compiled and updated dependency information is generated. |
| | 186 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
| | 187 | |
| | 188 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
| | 189 | |
| | 190 | ifndef CONFIG_MODVERSIONS |
| | 191 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
| | 192 | |
| | 193 | else |
| | 194 | # When module versioning is enabled the following steps are executed: |
| | 195 | # o compile a .tmp_<file>.o from <file>.c |
| | 196 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does |
| | 197 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and |
| | 198 | # are done. |
| | 199 | # o otherwise, we calculate symbol versions using the good old |
| | 200 | # genksyms on the preprocessed source and postprocess them in a way |
| | 201 | # that they are usable as a linker script |
| | 202 | # o generate <file>.o from .tmp_<file>.o using the linker to |
| | 203 | # replace the unresolved symbols __crc_exported_symbol with |
| | 204 | # the actual value of the checksum generated by genksyms |
| | 205 | |
| | 206 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< |
| | 207 | |
| | 208 | cmd_modversions_c = \ |
| | 209 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
| | 210 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
| | 211 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 212 | \ |
| | 213 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ |
| | 214 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 215 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 216 | else \ |
| | 217 | mv -f $(@D)/.tmp_$(@F) $@; \ |
| | 218 | fi; |
| | 219 | endif |
| | 220 | |
| | 221 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| | 222 | ifdef BUILD_C_RECORDMCOUNT |
| | 223 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line") |
| | 224 | RECORDMCOUNT_FLAGS = -w |
| | 225 | endif |
| | 226 | # Due to recursion, we must skip empty.o. |
| | 227 | # The empty.o file is created in the make process in order to determine |
| | 228 | # the target endianness and word size. It is made before all other C |
| | 229 | # files, including recordmcount. |
| | 230 | sub_cmd_record_mcount = \ |
| | 231 | if [ $(@) != "scripts/mod/empty.o" ]; then \ |
| | 232 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \ |
| | 233 | fi; |
| | 234 | recordmcount_source := $(srctree)/scripts/recordmcount.c \ |
| | 235 | $(srctree)/scripts/recordmcount.h |
| | 236 | else |
| | 237 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
| | 238 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \ |
| | 239 | "$(if $(CONFIG_64BIT),64,32)" \ |
| | 240 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \ |
| | 241 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \ |
| | 242 | "$(if $(part-of-module),1,0)" "$(@)"; |
| | 243 | recordmcount_source := $(srctree)/scripts/recordmcount.pl |
| | 244 | endif # BUILD_C_RECORDMCOUNT |
| | 245 | cmd_record_mcount = \ |
| | 246 | if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \ |
| | 247 | "$(CC_FLAGS_FTRACE)" ]; then \ |
| | 248 | $(sub_cmd_record_mcount) \ |
| | 249 | fi; |
| | 250 | endif # CONFIG_FTRACE_MCOUNT_RECORD |
| | 251 | |
| | 252 | ifdef CONFIG_STACK_VALIDATION |
| | 253 | ifneq ($(SKIP_STACK_VALIDATION),1) |
| | 254 | |
| | 255 | __objtool_obj := $(objtree)/tools/objtool/objtool |
| | 256 | |
| | 257 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) |
| | 258 | |
| | 259 | ifndef CONFIG_FRAME_POINTER |
| | 260 | objtool_args += --no-fp |
| | 261 | endif |
| | 262 | ifdef CONFIG_GCOV_KERNEL |
| | 263 | objtool_args += --no-unreachable |
| | 264 | else |
| | 265 | objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable) |
| | 266 | endif |
| | 267 | |
| | 268 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory |
| | 269 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file |
| | 270 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file |
| | 271 | cmd_objtool = $(if $(patsubst y%,, \ |
| | 272 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ |
| | 273 | $(__objtool_obj) $(objtool_args) "$(@)";) |
| | 274 | objtool_obj = $(if $(patsubst y%,, \ |
| | 275 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \ |
| | 276 | $(__objtool_obj)) |
| | 277 | |
| | 278 | endif # SKIP_STACK_VALIDATION |
| | 279 | endif # CONFIG_STACK_VALIDATION |
| | 280 | |
| | 281 | # Rebuild all objects when objtool changes, or is enabled/disabled. |
| | 282 | objtool_dep = $(objtool_obj) \ |
| | 283 | $(wildcard include/config/orc/unwinder.h \ |
| | 284 | include/config/stack/validation.h) |
| | 285 | |
| | 286 | define rule_cc_o_c |
| | 287 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
| | 288 | $(call cmd_and_fixdep,cc_o_c) \ |
| | 289 | $(cmd_modversions_c) \ |
| | 290 | $(cmd_checkdoc) \ |
| | 291 | $(call echo-cmd,objtool) $(cmd_objtool) \ |
| | 292 | $(call echo-cmd,record_mcount) $(cmd_record_mcount) |
| | 293 | endef |
| | 294 | |
| | 295 | define rule_as_o_S |
| | 296 | $(call cmd_and_fixdep,as_o_S) \ |
| | 297 | $(cmd_modversions_S) \ |
| | 298 | $(call echo-cmd,objtool) $(cmd_objtool) |
| | 299 | endef |
| | 300 | |
| | 301 | # List module undefined symbols (or empty line if not enabled) |
| | 302 | ifdef CONFIG_TRIM_UNUSED_KSYMS |
| | 303 | cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo |
| | 304 | else |
| | 305 | cmd_undef_syms = echo |
| | 306 | endif |
| | 307 | |
| | 308 | # Built-in and composite module parts |
| | 309 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
| | 310 | $(call cmd,force_checksrc) |
| | 311 | $(call if_changed_rule,cc_o_c) |
| | 312 | |
| | 313 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
| | 314 | |
| | 315 | $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE |
| | 316 | $(call cmd,force_checksrc) |
| | 317 | $(call if_changed_rule,cc_o_c) |
| | 318 | @{ echo $(@:.o=.ko); echo $@; \ |
| | 319 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) |
| | 320 | |
| | 321 | quiet_cmd_cc_lst_c = MKLST $@ |
| | 322 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
| | 323 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
| | 324 | System.map $(OBJDUMP) > $@ |
| | 325 | |
| | 326 | $(obj)/%.lst: $(src)/%.c FORCE |
| | 327 | $(call if_changed_dep,cc_lst_c) |
| | 328 | |
| | 329 | # Compile assembler sources (.S) |
| | 330 | # --------------------------------------------------------------------------- |
| | 331 | |
| | 332 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) |
| | 333 | |
| | 334 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
| | 335 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) |
| | 336 | |
| | 337 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h |
| | 338 | # or a file that it includes, in order to get versioned symbols. We build a |
| | 339 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from |
| | 340 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers. |
| | 341 | # |
| | 342 | # This is convoluted. The .S file must first be preprocessed to run guards and |
| | 343 | # expand names, then the resulting exports must be constructed into plain |
| | 344 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed |
| | 345 | # to make the genksyms input. |
| | 346 | # |
| | 347 | # These mirror gensymtypes_c and co above, keep them in synch. |
| | 348 | cmd_gensymtypes_S = \ |
| | 349 | (echo "\#include <linux/kernel.h>" ; \ |
| | 350 | echo "\#include <asm/asm-prototypes.h>" ; \ |
| | 351 | $(CPP) $(a_flags) $< | \ |
| | 352 | grep "\<___EXPORT_SYMBOL\>" | \ |
| | 353 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \ |
| | 354 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \ |
| | 355 | $(GENKSYMS) $(if $(1), -T $(2)) \ |
| | 356 | $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \ |
| | 357 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \ |
| | 358 | $(if $(KBUILD_PRESERVE),-p) \ |
| | 359 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) |
| | 360 | |
| | 361 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@ |
| | 362 | cmd_cc_symtypes_S = \ |
| | 363 | set -e; \ |
| | 364 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \ |
| | 365 | test -s $@ || rm -f $@ |
| | 366 | |
| | 367 | $(obj)/%.symtypes : $(src)/%.S FORCE |
| | 368 | $(call cmd,cc_symtypes_S) |
| | 369 | |
| | 370 | |
| | 371 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@ |
| | 372 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $< |
| | 373 | |
| | 374 | $(obj)/%.s: $(src)/%.S FORCE |
| | 375 | $(call if_changed_dep,cpp_s_S) |
| | 376 | |
| | 377 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
| | 378 | |
| | 379 | ifndef CONFIG_MODVERSIONS |
| | 380 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
| | 381 | |
| | 382 | else |
| | 383 | |
| | 384 | ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) |
| | 385 | |
| | 386 | ifeq ($(ASM_PROTOTYPES),) |
| | 387 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
| | 388 | |
| | 389 | else |
| | 390 | |
| | 391 | # versioning matches the C process described above, with difference that |
| | 392 | # we parse asm-prototypes.h C header to get function definitions. |
| | 393 | |
| | 394 | cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< |
| | 395 | |
| | 396 | cmd_modversions_S = \ |
| | 397 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \ |
| | 398 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \ |
| | 399 | > $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 400 | \ |
| | 401 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \ |
| | 402 | -T $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 403 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \ |
| | 404 | else \ |
| | 405 | mv -f $(@D)/.tmp_$(@F) $@; \ |
| | 406 | fi; |
| | 407 | endif |
| | 408 | endif |
| | 409 | |
| | 410 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE |
| | 411 | $(call if_changed_rule,as_o_S) |
| | 412 | |
| | 413 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
| | 414 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
| | 415 | |
| | 416 | # Linker scripts preprocessor (.lds.S -> .lds) |
| | 417 | # --------------------------------------------------------------------------- |
| | 418 | quiet_cmd_cpp_lds_S = LDS $@ |
| | 419 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \ |
| | 420 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< |
| | 421 | |
| | 422 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
| | 423 | $(call if_changed_dep,cpp_lds_S) |
| | 424 | |
| | 425 | # ASN.1 grammar |
| | 426 | # --------------------------------------------------------------------------- |
| | 427 | quiet_cmd_asn1_compiler = ASN.1 $@ |
| | 428 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \ |
| | 429 | $(subst .h,.c,$@) $(subst .c,.h,$@) |
| | 430 | |
| | 431 | .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h |
| | 432 | |
| | 433 | $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler |
| | 434 | $(call cmd,asn1_compiler) |
| | 435 | |
| | 436 | # Build the compiled-in targets |
| | 437 | # --------------------------------------------------------------------------- |
| | 438 | |
| | 439 | # To build objects in subdirs, we need to descend into the directories |
| | 440 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
| | 441 | |
| | 442 | # |
| | 443 | # Rule to compile a set of .o files into one .o file |
| | 444 | # |
| | 445 | ifdef builtin-target |
| | 446 | |
| | 447 | ifdef CONFIG_THIN_ARCHIVES |
| | 448 | cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
| | 449 | cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) |
| | 450 | quiet_cmd_link_o_target = AR $@ |
| | 451 | else |
| | 452 | cmd_make_builtin = $(LD) $(ld_flags) -r -o |
| | 453 | cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) |
| | 454 | quiet_cmd_link_o_target = LD $@ |
| | 455 | endif |
| | 456 | |
| | 457 | # If the list of objects to link is empty, just create an empty built-in.o |
| | 458 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
| | 459 | $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \ |
| | 460 | $(cmd_secanalysis),\ |
| | 461 | $(cmd_make_empty_builtin) $@) |
| | 462 | |
| | 463 | $(builtin-target): $(obj-y) FORCE |
| | 464 | $(call if_changed,link_o_target) |
| | 465 | |
| | 466 | targets += $(builtin-target) |
| | 467 | endif # builtin-target |
| | 468 | |
| | 469 | # |
| | 470 | # Rule to create modules.order file |
| | 471 | # |
| | 472 | # Create commands to either record .ko file or cat modules.order from |
| | 473 | # a subdirectory |
| | 474 | modorder-cmds = \ |
| | 475 | $(foreach m, $(modorder), \ |
| | 476 | $(if $(filter %/modules.order, $m), \ |
| | 477 | cat $m;, echo kernel/$m;)) |
| | 478 | |
| | 479 | $(modorder-target): $(subdir-ym) FORCE |
| | 480 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ |
| | 481 | |
| | 482 | # |
| | 483 | # Rule to compile a set of .o files into one .a file |
| | 484 | # |
| | 485 | ifdef lib-target |
| | 486 | quiet_cmd_link_l_target = AR $@ |
| | 487 | |
| | 488 | ifdef CONFIG_THIN_ARCHIVES |
| | 489 | cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) |
| | 490 | else |
| | 491 | cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y) |
| | 492 | endif |
| | 493 | |
| | 494 | $(lib-target): $(lib-y) FORCE |
| | 495 | $(call if_changed,link_l_target) |
| | 496 | |
| | 497 | targets += $(lib-target) |
| | 498 | |
| | 499 | dummy-object = $(obj)/.lib_exports.o |
| | 500 | ksyms-lds = $(dot-target).lds |
| | 501 | ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX |
| | 502 | ref_prefix = EXTERN(_ |
| | 503 | else |
| | 504 | ref_prefix = EXTERN( |
| | 505 | endif |
| | 506 | |
| | 507 | quiet_cmd_export_list = EXPORTS $@ |
| | 508 | cmd_export_list = $(OBJDUMP) -h $< | \ |
| | 509 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\ |
| | 510 | rm -f $(dummy-object);\ |
| | 511 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\ |
| | 512 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\ |
| | 513 | rm $(dummy-object) $(ksyms-lds) |
| | 514 | |
| | 515 | $(obj)/lib-ksyms.o: $(lib-target) FORCE |
| | 516 | $(call if_changed,export_list) |
| | 517 | |
| | 518 | targets += $(obj)/lib-ksyms.o |
| | 519 | |
| | 520 | endif |
| | 521 | |
| | 522 | # |
| | 523 | # Rule to link composite objects |
| | 524 | # |
| | 525 | # Composite objects are specified in kbuild makefile as follows: |
| | 526 | # <composite-object>-objs := <list of .o files> |
| | 527 | # or |
| | 528 | # <composite-object>-y := <list of .o files> |
| | 529 | # or |
| | 530 | # <composite-object>-m := <list of .o files> |
| | 531 | # The -m syntax only works if <composite object> is a module |
| | 532 | link_multi_deps = \ |
| | 533 | $(filter $(addprefix $(obj)/, \ |
| | 534 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
| | 535 | $($(subst $(obj)/,,$(@:.o=-y))) \ |
| | 536 | $($(subst $(obj)/,,$(@:.o=-m)))), $^) |
| | 537 | |
| | 538 | cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
| | 539 | |
| | 540 | ifdef CONFIG_THIN_ARCHIVES |
| | 541 | quiet_cmd_link_multi-y = AR $@ |
| | 542 | cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps) |
| | 543 | else |
| | 544 | quiet_cmd_link_multi-y = LD $@ |
| | 545 | cmd_link_multi-y = $(cmd_link_multi-link) |
| | 546 | endif |
| | 547 | |
| | 548 | quiet_cmd_link_multi-m = LD [M] $@ |
| | 549 | cmd_link_multi-m = $(cmd_link_multi-link) |
| | 550 | |
| | 551 | $(multi-used-y): FORCE |
| | 552 | $(call if_changed,link_multi-y) |
| | 553 | $(call multi_depend, $(multi-used-y), .o, -objs -y) |
| | 554 | |
| | 555 | $(multi-used-m): FORCE |
| | 556 | $(call if_changed,link_multi-m) |
| | 557 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); \ |
| | 558 | $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) |
| | 559 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m) |
| | 560 | |
| | 561 | targets += $(multi-used-y) $(multi-used-m) |
| | 562 | targets := $(filter-out $(PHONY), $(targets)) |
| | 563 | |
| | 564 | # Descending |
| | 565 | # --------------------------------------------------------------------------- |
| | 566 | |
| | 567 | PHONY += $(subdir-ym) |
| | 568 | $(subdir-ym): |
| | 569 | $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1) |
| | 570 | |
| | 571 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
| | 572 | # --------------------------------------------------------------------------- |
| | 573 | |
| | 574 | PHONY += FORCE |
| | 575 | |
| | 576 | FORCE: |
| | 577 | |
| | 578 | # Read all saved command lines and dependencies for the $(targets) we |
| | 579 | # may be building above, using $(if_changed{,_dep}). As an |
| | 580 | # optimization, we don't need to read them if the target does not |
| | 581 | # exist, we will rebuild anyway in that case. |
| | 582 | |
| | 583 | cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) |
| | 584 | |
| | 585 | ifneq ($(cmd_files),) |
| | 586 | include $(cmd_files) |
| | 587 | endif |
| | 588 | |
| | 589 | ifneq ($(KBUILD_SRC),) |
| | 590 | # Create directories for object files if they do not exist |
| | 591 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets)))) |
| | 592 | # If cmd_files exist, their directories apparently exist. Skip mkdir. |
| | 593 | exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files)))) |
| | 594 | obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs))) |
| | 595 | ifneq ($(obj-dirs),) |
| | 596 | $(shell mkdir -p $(obj-dirs)) |
| | 597 | endif |
| | 598 | endif |
| | 599 | |
| | 600 | # Declare the contents of the .PHONY variable as phony. We keep that |
| | 601 | # information in a variable se we can use it in if_changed and friends. |
| | 602 | |
| | 603 | .PHONY: $(PHONY) |
projects / linux-2.6-block.git / blame_incremental