Kbuild.include 12 KB

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  1. ####
  2. # kbuild: Generic definitions
  3. # Convenient variables
  4. comma := ,
  5. quote := "
  6. squote := '
  7. empty :=
  8. space := $(empty) $(empty)
  9. pound := \#
  10. ###
  11. # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
  12. dot-target = $(dir $@).$(notdir $@)
  13. ###
  14. # The temporary file to save gcc -MD generated dependencies must not
  15. # contain a comma
  16. depfile = $(subst $(comma),_,$(dot-target).d)
  17. ###
  18. # filename of target with directory and extension stripped
  19. basetarget = $(basename $(notdir $@))
  20. ###
  21. # filename of first prerequisite with directory and extension stripped
  22. baseprereq = $(basename $(notdir $<))
  23. ###
  24. # Escape single quote for use in echo statements
  25. escsq = $(subst $(squote),'\$(squote)',$1)
  26. ###
  27. # Easy method for doing a status message
  28. kecho := :
  29. quiet_kecho := echo
  30. silent_kecho := :
  31. kecho := $($(quiet)kecho)
  32. ###
  33. # filechk is used to check if the content of a generated file is updated.
  34. # Sample usage:
  35. # define filechk_sample
  36. # echo $KERNELRELEASE
  37. # endef
  38. # version.h : Makefile
  39. # $(call filechk,sample)
  40. # The rule defined shall write to stdout the content of the new file.
  41. # The existing file will be compared with the new one.
  42. # - If no file exist it is created
  43. # - If the content differ the new file is used
  44. # - If they are equal no change, and no timestamp update
  45. # - stdin is piped in from the first prerequisite ($<) so one has
  46. # to specify a valid file as first prerequisite (often the kbuild file)
  47. define filechk
  48. $(Q)set -e; \
  49. mkdir -p $(dir $@); \
  50. $(filechk_$(1)) < $< > $@.tmp; \
  51. if [ -r $@ ] && cmp -s $@ $@.tmp; then \
  52. rm -f $@.tmp; \
  53. else \
  54. $(kecho) ' UPD $@'; \
  55. mv -f $@.tmp $@; \
  56. fi
  57. endef
  58. ######
  59. # gcc support functions
  60. # See documentation in Documentation/kbuild/makefiles.txt
  61. # cc-cross-prefix
  62. # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
  63. # Return first prefix where a prefix$(CC) is found in PATH.
  64. # If no $(CC) found in PATH with listed prefixes return nothing
  65. cc-cross-prefix = \
  66. $(word 1, $(foreach c,$(1), \
  67. $(shell set -e; \
  68. if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
  69. echo $(c); \
  70. fi)))
  71. # output directory for tests below
  72. TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
  73. # try-run
  74. # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
  75. # Exit code chooses option. "$$TMP" is can be used as temporary file and
  76. # is automatically cleaned up.
  77. # modifed for U-Boot: prevent cc-option from leaving .*.su files
  78. try-run = $(shell set -e; \
  79. TMP="$(TMPOUT).$$$$.tmp"; \
  80. TMPO="$(TMPOUT).$$$$.o"; \
  81. TMPSU="$(TMPOUT).$$$$.su"; \
  82. if ($(1)) >/dev/null 2>&1; \
  83. then echo "$(2)"; \
  84. else echo "$(3)"; \
  85. fi; \
  86. rm -f "$$TMP" "$$TMPO" "$$TMPSU")
  87. # as-option
  88. # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
  89. as-option = $(call try-run,\
  90. $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
  91. # as-instr
  92. # Usage: cflags-y += $(call as-instr,instr,option1,option2)
  93. as-instr = $(call try-run,\
  94. printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
  95. # __cc-option
  96. # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
  97. __cc-option = $(call try-run,\
  98. $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
  99. # cc-option
  100. # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
  101. cc-option = $(call __cc-option, $(CC),\
  102. $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
  103. # hostcc-option
  104. # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
  105. hostcc-option = $(call __cc-option, $(HOSTCC),\
  106. $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
  107. # cc-option-yn
  108. # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
  109. cc-option-yn = $(call try-run,\
  110. $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
  111. # cc-disable-warning
  112. # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
  113. cc-disable-warning = $(call try-run,\
  114. $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
  115. # cc-name
  116. # Expands to either gcc or clang
  117. cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
  118. # cc-version
  119. cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
  120. # cc-fullversion
  121. cc-fullversion = $(shell $(CONFIG_SHELL) \
  122. $(srctree)/scripts/gcc-version.sh -p $(CC))
  123. # cc-ifversion
  124. # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
  125. cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
  126. # added for U-Boot
  127. binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
  128. # cc-ldoption
  129. # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
  130. cc-ldoption = $(call try-run,\
  131. $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
  132. # ld-option
  133. # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
  134. ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
  135. # ar-option
  136. # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
  137. # Important: no spaces around options
  138. ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
  139. # ld-version
  140. # Note this is mainly for HJ Lu's 3 number binutil versions
  141. ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
  142. # ld-ifversion
  143. # Usage: $(call ld-ifversion, -ge, 22252, y)
  144. ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
  145. ######
  146. ###
  147. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
  148. # Usage:
  149. # $(Q)$(MAKE) $(build)=dir
  150. build := -f $(srctree)/scripts/Makefile.build obj
  151. ###
  152. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
  153. # Usage:
  154. # $(Q)$(MAKE) $(modbuiltin)=dir
  155. modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
  156. ###
  157. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
  158. # Usage:
  159. # $(Q)$(MAKE) $(dtbinst)=dir
  160. dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
  161. ###
  162. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
  163. # Usage:
  164. # $(Q)$(MAKE) $(clean)=dir
  165. clean := -f $(srctree)/scripts/Makefile.clean obj
  166. ###
  167. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
  168. # Usage:
  169. # $(Q)$(MAKE) $(hdr-inst)=dir
  170. hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
  171. # Prefix -I with $(srctree) if it is not an absolute path.
  172. # skip if -I has no parameter
  173. addtree = $(if $(patsubst -I%,%,$(1)), \
  174. $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
  175. # Find all -I options and call addtree
  176. flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
  177. # echo command.
  178. # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
  179. echo-cmd = $(if $($(quiet)cmd_$(1)),\
  180. echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
  181. # printing commands
  182. cmd = @$(echo-cmd) $(cmd_$(1))
  183. # Add $(obj)/ for paths that are not absolute
  184. objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
  185. ###
  186. # if_changed - execute command if any prerequisite is newer than
  187. # target, or command line has changed
  188. # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
  189. # including used config symbols
  190. # if_changed_rule - as if_changed but execute rule instead
  191. # See Documentation/kbuild/makefiles.txt for more info
  192. ifneq ($(KBUILD_NOCMDDEP),1)
  193. # Check if both arguments has same arguments. Result is empty string if equal.
  194. # User may override this check using make KBUILD_NOCMDDEP=1
  195. arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
  196. $(filter-out $(cmd_$@), $(cmd_$(1))) )
  197. else
  198. arg-check = $(if $(strip $(cmd_$@)),,1)
  199. endif
  200. # Replace >$< with >$$< to preserve $ when reloading the .cmd file
  201. # (needed for make)
  202. # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
  203. # (needed for make)
  204. # Replace >'< with >'\''< to be able to enclose the whole string in '...'
  205. # (needed for the shell)
  206. make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
  207. # Find any prerequisites that is newer than target or that does not exist.
  208. # PHONY targets skipped in both cases.
  209. any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
  210. # Execute command if command has changed or prerequisite(s) are updated.
  211. #
  212. if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
  213. @set -e; \
  214. $(echo-cmd) $(cmd_$(1)); \
  215. printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
  216. # Execute the command and also postprocess generated .d dependencies file.
  217. if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
  218. @set -e; \
  219. $(echo-cmd) $(cmd_$(1)); \
  220. scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
  221. rm -f $(depfile); \
  222. mv -f $(dot-target).tmp $(dot-target).cmd)
  223. # Usage: $(call if_changed_rule,foo)
  224. # Will check if $(cmd_foo) or any of the prerequisites changed,
  225. # and if so will execute $(rule_foo).
  226. if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
  227. @set -e; \
  228. $(rule_$(1)))
  229. ###
  230. # why - tell why a a target got build
  231. # enabled by make V=2
  232. # Output (listed in the order they are checked):
  233. # (1) - due to target is PHONY
  234. # (2) - due to target missing
  235. # (3) - due to: file1.h file2.h
  236. # (4) - due to command line change
  237. # (5) - due to missing .cmd file
  238. # (6) - due to target not in $(targets)
  239. # (1) PHONY targets are always build
  240. # (2) No target, so we better build it
  241. # (3) Prerequisite is newer than target
  242. # (4) The command line stored in the file named dir/.target.cmd
  243. # differed from actual command line. This happens when compiler
  244. # options changes
  245. # (5) No dir/.target.cmd file (used to store command line)
  246. # (6) No dir/.target.cmd file and target not listed in $(targets)
  247. # This is a good hint that there is a bug in the kbuild file
  248. ifeq ($(KBUILD_VERBOSE),2)
  249. why = \
  250. $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
  251. $(if $(wildcard $@), \
  252. $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
  253. $(if $(arg-check), \
  254. $(if $(cmd_$@),- due to command line change, \
  255. $(if $(filter $@, $(targets)), \
  256. - due to missing .cmd file, \
  257. - due to $(notdir $@) not in $$(targets) \
  258. ) \
  259. ) \
  260. ) \
  261. ), \
  262. - due to target missing \
  263. ) \
  264. )
  265. echo-why = $(call escsq, $(strip $(why)))
  266. endif
  267. # delete partially updated (i.e. corrupted) files on error
  268. .DELETE_ON_ERROR:
  269. # do not delete intermediate files automatically
  270. .SECONDARY:
  271. ifdef CONFIG_SPL_BUILD
  272. SPL_ := SPL_
  273. ifeq ($(CONFIG_TPL_BUILD),y)
  274. SPL_TPL_ := TPL_
  275. else
  276. SPL_TPL_ := SPL_
  277. endif
  278. else
  279. SPL_ :=
  280. SPL_TPL_ :=
  281. endif