Makefile.build 16 KB

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  1. # ==========================================================================
  2. # Building
  3. # ==========================================================================
  4. # Modified for U-Boot
  5. ifeq ($(CONFIG_TPL_BUILD),y)
  6. src := $(patsubst tpl/%,%,$(obj))
  7. else
  8. ifeq ($(CONFIG_SPL_BUILD),y)
  9. src := $(patsubst spl/%,%,$(obj))
  10. else
  11. src := $(obj)
  12. endif
  13. endif
  14. PHONY := __build
  15. __build:
  16. # Init all relevant variables used in kbuild files so
  17. # 1) they have correct type
  18. # 2) they do not inherit any value from the environment
  19. obj-y :=
  20. obj-m :=
  21. lib-y :=
  22. lib-m :=
  23. always :=
  24. targets :=
  25. subdir-y :=
  26. subdir-m :=
  27. EXTRA_AFLAGS :=
  28. EXTRA_CFLAGS :=
  29. EXTRA_CPPFLAGS :=
  30. EXTRA_LDFLAGS :=
  31. asflags-y :=
  32. ccflags-y :=
  33. cppflags-y :=
  34. ldflags-y :=
  35. subdir-asflags-y :=
  36. subdir-ccflags-y :=
  37. # Read auto.conf if it exists, otherwise ignore
  38. -include include/config/auto.conf
  39. include scripts/Kbuild.include
  40. # Added for U-Boot
  41. # We must include config.mk after Kbuild.include
  42. # so that some config.mk can use cc-option.
  43. include config.mk
  44. # For backward compatibility check that these variables do not change
  45. save-cflags := $(CFLAGS)
  46. # The filename Kbuild has precedence over Makefile
  47. kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
  48. kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
  49. include $(kbuild-file)
  50. # If the save-* variables changed error out
  51. ifeq ($(KBUILD_NOPEDANTIC),)
  52. ifneq ("$(save-cflags)","$(CFLAGS)")
  53. $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
  54. endif
  55. endif
  56. #
  57. # make W=... settings
  58. #
  59. # W=1 - warnings that may be relevant and does not occur too often
  60. # W=2 - warnings that occur quite often but may still be relevant
  61. # W=3 - the more obscure warnings, can most likely be ignored
  62. #
  63. # $(call cc-option, -W...) handles gcc -W.. options which
  64. # are not supported by all versions of the compiler
  65. ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
  66. warning- := $(empty)
  67. warning-1 := -Wextra -Wunused -Wno-unused-parameter
  68. warning-1 += -Wmissing-declarations
  69. warning-1 += -Wmissing-format-attribute
  70. warning-1 += -Wmissing-prototypes
  71. warning-1 += -Wold-style-definition
  72. warning-1 += $(call cc-option, -Wmissing-include-dirs)
  73. warning-1 += $(call cc-option, -Wunused-but-set-variable)
  74. warning-1 += $(call cc-disable-warning, missing-field-initializers)
  75. warning-2 := -Waggregate-return
  76. warning-2 += -Wcast-align
  77. warning-2 += -Wdisabled-optimization
  78. warning-2 += -Wnested-externs
  79. warning-2 += -Wshadow
  80. warning-2 += $(call cc-option, -Wlogical-op)
  81. warning-2 += $(call cc-option, -Wmissing-field-initializers)
  82. warning-3 := -Wbad-function-cast
  83. warning-3 += -Wcast-qual
  84. warning-3 += -Wconversion
  85. warning-3 += -Wpacked
  86. warning-3 += -Wpadded
  87. warning-3 += -Wpointer-arith
  88. warning-3 += -Wredundant-decls
  89. warning-3 += -Wswitch-default
  90. warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
  91. warning-3 += $(call cc-option, -Wvla)
  92. warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  93. warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  94. warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
  95. ifeq ("$(strip $(warning))","")
  96. $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
  97. endif
  98. KBUILD_CFLAGS += $(warning)
  99. endif
  100. include scripts/Makefile.lib
  101. ifdef host-progs
  102. ifneq ($(hostprogs-y),$(host-progs))
  103. $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
  104. hostprogs-y += $(host-progs)
  105. endif
  106. endif
  107. # Do not include host rules unless needed
  108. ifneq ($(hostprogs-y)$(hostprogs-m),)
  109. include scripts/Makefile.host
  110. endif
  111. # Uncommented for U-Boot
  112. # We need to create output dicrectory for SPL and TPL even for in-tree build
  113. #ifneq ($(KBUILD_SRC),)
  114. # Create output directory if not already present
  115. _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
  116. # Create directories for object files if directory does not exist
  117. # Needed when obj-y := dir/file.o syntax is used
  118. _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
  119. #endif
  120. ifndef obj
  121. $(warning kbuild: Makefile.build is included improperly)
  122. endif
  123. # ===========================================================================
  124. ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
  125. lib-target := $(obj)/lib.a
  126. endif
  127. ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
  128. builtin-target := $(obj)/built-in.o
  129. endif
  130. modorder-target := $(obj)/modules.order
  131. # We keep a list of all modules in $(MODVERDIR)
  132. __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
  133. $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
  134. $(subdir-ym) $(always)
  135. @:
  136. # Linus' kernel sanity checking tool
  137. ifneq ($(KBUILD_CHECKSRC),0)
  138. ifeq ($(KBUILD_CHECKSRC),2)
  139. quiet_cmd_force_checksrc = CHECK $<
  140. cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  141. else
  142. quiet_cmd_checksrc = CHECK $<
  143. cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  144. endif
  145. endif
  146. # Do section mismatch analysis for each module/built-in.o
  147. ifdef CONFIG_DEBUG_SECTION_MISMATCH
  148. cmd_secanalysis = ; scripts/mod/modpost $@
  149. endif
  150. # Compile C sources (.c)
  151. # ---------------------------------------------------------------------------
  152. # Default is built-in, unless we know otherwise
  153. modkern_cflags = \
  154. $(if $(part-of-module), \
  155. $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
  156. $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
  157. quiet_modtag := $(empty) $(empty)
  158. $(real-objs-m) : part-of-module := y
  159. $(real-objs-m:.o=.i) : part-of-module := y
  160. $(real-objs-m:.o=.s) : part-of-module := y
  161. $(real-objs-m:.o=.lst): part-of-module := y
  162. $(real-objs-m) : quiet_modtag := [M]
  163. $(real-objs-m:.o=.i) : quiet_modtag := [M]
  164. $(real-objs-m:.o=.s) : quiet_modtag := [M]
  165. $(real-objs-m:.o=.lst): quiet_modtag := [M]
  166. $(obj-m) : quiet_modtag := [M]
  167. # Default for not multi-part modules
  168. modname = $(basetarget)
  169. $(multi-objs-m) : modname = $(modname-multi)
  170. $(multi-objs-m:.o=.i) : modname = $(modname-multi)
  171. $(multi-objs-m:.o=.s) : modname = $(modname-multi)
  172. $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
  173. $(multi-objs-y) : modname = $(modname-multi)
  174. $(multi-objs-y:.o=.i) : modname = $(modname-multi)
  175. $(multi-objs-y:.o=.s) : modname = $(modname-multi)
  176. $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
  177. quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
  178. cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
  179. $(obj)/%.s: $(src)/%.c FORCE
  180. $(call if_changed_dep,cc_s_c)
  181. quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
  182. cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
  183. $(obj)/%.i: $(src)/%.c FORCE
  184. $(call if_changed_dep,cc_i_c)
  185. cmd_gensymtypes = \
  186. $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
  187. $(GENKSYMS) $(if $(1), -T $(2)) \
  188. $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
  189. $(if $(KBUILD_PRESERVE),-p) \
  190. -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
  191. quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
  192. cmd_cc_symtypes_c = \
  193. set -e; \
  194. $(call cmd_gensymtypes,true,$@) >/dev/null; \
  195. test -s $@ || rm -f $@
  196. $(obj)/%.symtypes : $(src)/%.c FORCE
  197. $(call cmd,cc_symtypes_c)
  198. # C (.c) files
  199. # The C file is compiled and updated dependency information is generated.
  200. # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
  201. quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
  202. ifndef CONFIG_MODVERSIONS
  203. cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  204. else
  205. # When module versioning is enabled the following steps are executed:
  206. # o compile a .tmp_<file>.o from <file>.c
  207. # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
  208. # not export symbols, we just rename .tmp_<file>.o to <file>.o and
  209. # are done.
  210. # o otherwise, we calculate symbol versions using the good old
  211. # genksyms on the preprocessed source and postprocess them in a way
  212. # that they are usable as a linker script
  213. # o generate <file>.o from .tmp_<file>.o using the linker to
  214. # replace the unresolved symbols __crc_exported_symbol with
  215. # the actual value of the checksum generated by genksyms
  216. cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
  217. cmd_modversions = \
  218. if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
  219. $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
  220. > $(@D)/.tmp_$(@F:.o=.ver); \
  221. \
  222. $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
  223. -T $(@D)/.tmp_$(@F:.o=.ver); \
  224. rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
  225. else \
  226. mv -f $(@D)/.tmp_$(@F) $@; \
  227. fi;
  228. endif
  229. ifdef CONFIG_FTRACE_MCOUNT_RECORD
  230. ifdef BUILD_C_RECORDMCOUNT
  231. ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
  232. RECORDMCOUNT_FLAGS = -w
  233. endif
  234. # Due to recursion, we must skip empty.o.
  235. # The empty.o file is created in the make process in order to determine
  236. # the target endianness and word size. It is made before all other C
  237. # files, including recordmcount.
  238. sub_cmd_record_mcount = \
  239. if [ $(@) != "scripts/mod/empty.o" ]; then \
  240. $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
  241. fi;
  242. recordmcount_source := $(srctree)/scripts/recordmcount.c \
  243. $(srctree)/scripts/recordmcount.h
  244. else
  245. sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
  246. "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
  247. "$(if $(CONFIG_64BIT),64,32)" \
  248. "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
  249. "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
  250. "$(if $(part-of-module),1,0)" "$(@)";
  251. recordmcount_source := $(srctree)/scripts/recordmcount.pl
  252. endif
  253. cmd_record_mcount = \
  254. if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \
  255. $(sub_cmd_record_mcount) \
  256. fi;
  257. endif
  258. define rule_cc_o_c
  259. $(call echo-cmd,checksrc) $(cmd_checksrc) \
  260. $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
  261. $(cmd_modversions) \
  262. $(call echo-cmd,record_mcount) \
  263. $(cmd_record_mcount) \
  264. scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
  265. $(dot-target).tmp; \
  266. rm -f $(depfile); \
  267. mv -f $(dot-target).tmp $(dot-target).cmd
  268. endef
  269. # Built-in and composite module parts
  270. $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
  271. $(call cmd,force_checksrc)
  272. $(call if_changed_rule,cc_o_c)
  273. # Single-part modules are special since we need to mark them in $(MODVERDIR)
  274. $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
  275. $(call cmd,force_checksrc)
  276. $(call if_changed_rule,cc_o_c)
  277. @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
  278. quiet_cmd_cc_lst_c = MKLST $@
  279. cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
  280. $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
  281. System.map $(OBJDUMP) > $@
  282. $(obj)/%.lst: $(src)/%.c FORCE
  283. $(call if_changed_dep,cc_lst_c)
  284. # Compile assembler sources (.S)
  285. # ---------------------------------------------------------------------------
  286. modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
  287. $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
  288. $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
  289. quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
  290. cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
  291. $(obj)/%.s: $(src)/%.S FORCE
  292. $(call if_changed_dep,as_s_S)
  293. quiet_cmd_as_o_S = AS $(quiet_modtag) $@
  294. cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
  295. $(obj)/%.o: $(src)/%.S FORCE
  296. $(call if_changed_dep,as_o_S)
  297. targets += $(real-objs-y) $(real-objs-m) $(lib-y)
  298. targets += $(extra-y) $(MAKECMDGOALS) $(always)
  299. # Linker scripts preprocessor (.lds.S -> .lds)
  300. # ---------------------------------------------------------------------------
  301. quiet_cmd_cpp_lds_S = LDS $@
  302. cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
  303. -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
  304. $(obj)/%.lds: $(src)/%.lds.S FORCE
  305. $(call if_changed_dep,cpp_lds_S)
  306. # ASN.1 grammar
  307. # ---------------------------------------------------------------------------
  308. quiet_cmd_asn1_compiler = ASN.1 $@
  309. cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
  310. $(subst .h,.c,$@) $(subst .c,.h,$@)
  311. .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
  312. $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
  313. $(call cmd,asn1_compiler)
  314. # Build the compiled-in targets
  315. # ---------------------------------------------------------------------------
  316. # To build objects in subdirs, we need to descend into the directories
  317. $(sort $(subdir-obj-y)): $(subdir-ym) ;
  318. #
  319. # Rule to compile a set of .o files into one .o file
  320. #
  321. ifdef builtin-target
  322. quiet_cmd_link_o_target = LD $@
  323. # If the list of objects to link is empty, just create an empty built-in.o
  324. cmd_link_o_target = $(if $(strip $(obj-y)),\
  325. $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
  326. $(cmd_secanalysis),\
  327. rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
  328. $(builtin-target): $(obj-y) FORCE
  329. $(call if_changed,link_o_target)
  330. targets += $(builtin-target)
  331. endif # builtin-target
  332. #
  333. # Rule to create modules.order file
  334. #
  335. # Create commands to either record .ko file or cat modules.order from
  336. # a subdirectory
  337. modorder-cmds = \
  338. $(foreach m, $(modorder), \
  339. $(if $(filter %/modules.order, $m), \
  340. cat $m;, echo kernel/$m;))
  341. $(modorder-target): $(subdir-ym) FORCE
  342. $(Q)(cat /dev/null; $(modorder-cmds)) > $@
  343. #
  344. # Rule to compile a set of .o files into one .a file
  345. #
  346. ifdef lib-target
  347. quiet_cmd_link_l_target = AR $@
  348. cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
  349. $(lib-target): $(lib-y) FORCE
  350. $(call if_changed,link_l_target)
  351. targets += $(lib-target)
  352. endif
  353. #
  354. # Rule to link composite objects
  355. #
  356. # Composite objects are specified in kbuild makefile as follows:
  357. # <composite-object>-objs := <list of .o files>
  358. # or
  359. # <composite-object>-y := <list of .o files>
  360. link_multi_deps = \
  361. $(filter $(addprefix $(obj)/, \
  362. $($(subst $(obj)/,,$(@:.o=-objs))) \
  363. $($(subst $(obj)/,,$(@:.o=-y)))), $^)
  364. quiet_cmd_link_multi-y = LD $@
  365. cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
  366. quiet_cmd_link_multi-m = LD [M] $@
  367. cmd_link_multi-m = $(cmd_link_multi-y)
  368. # We would rather have a list of rules like
  369. # foo.o: $(foo-objs)
  370. # but that's not so easy, so we rather make all composite objects depend
  371. # on the set of all their parts
  372. $(multi-used-y) : %.o: $(multi-objs-y) FORCE
  373. $(call if_changed,link_multi-y)
  374. $(multi-used-m) : %.o: $(multi-objs-m) FORCE
  375. $(call if_changed,link_multi-m)
  376. @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
  377. targets += $(multi-used-y) $(multi-used-m)
  378. # Descending
  379. # ---------------------------------------------------------------------------
  380. PHONY += $(subdir-ym)
  381. $(subdir-ym):
  382. $(Q)$(MAKE) $(build)=$@
  383. # Add FORCE to the prequisites of a target to force it to be always rebuilt.
  384. # ---------------------------------------------------------------------------
  385. PHONY += FORCE
  386. FORCE:
  387. # Read all saved command lines and dependencies for the $(targets) we
  388. # may be building above, using $(if_changed{,_dep}). As an
  389. # optimization, we don't need to read them if the target does not
  390. # exist, we will rebuild anyway in that case.
  391. targets := $(wildcard $(sort $(targets)))
  392. cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
  393. ifneq ($(cmd_files),)
  394. include $(cmd_files)
  395. endif
  396. # Declare the contents of the .PHONY variable as phony. We keep that
  397. # information in a variable se we can use it in if_changed and friends.
  398. .PHONY: $(PHONY)