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@cyysu 2017-10-16T09:58:11.000000Z 字数 9750 阅读 1121

Makefile-项目篇(四)

  • 时间：2017年10月16日
  • 作者：Kali
  • 邮箱：cyysu.github.io@gmail.com
  • 版本：3.0
  • 描述：Makefile-项目四，继Makefile项目篇三的Makefile

Makefile系列教程

实战项目

  1. # 从250行之后到609行
  2. # Cross compiling and selecting different set of gcc/bin-utils
  3. # ---------------------------------------------------------------------------
  4. #
  5. # When performing cross compilation for other architectures ARCH shall be set
  6. # to the target architecture. (See arch/* for the possibilities).
  7. # ARCH can be set during invocation of make:
  8. # make ARCH=ia64
  9. # Another way is to have ARCH set in the environment.
  10. # The default ARCH is the host where make is executed.
  12. # CROSS_COMPILE specify the prefix used for all executables used
  13. # during compilation. Only gcc and related bin-utils executables
  14. # are prefixed with $(CROSS_COMPILE).
  15. # CROSS_COMPILE can be set on the command line
  16. # make CROSS_COMPILE=ia64-linux-
  17. # Alternatively CROSS_COMPILE can be set in the environment.
  18. # A third alternative is to store a setting in .config so that plain
  19. # "make" in the configured kernel build directory always uses that.
  20. # Default value for CROSS_COMPILE is not to prefix executables
  21. # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  22. ARCH		?= $(SUBARCH)
  23. CROSS_COMPILE   ?= $(CONFIG_CROSS_COMPILE:"%"=%)
  25. # Architecture as present in compile.h
  26. UTS_MACHINE     := $(ARCH)
  27. SRCARCH 	:= $(ARCH)
  29. # Additional ARCH settings for x86
  30. ifeq ($(ARCH),i386)
  31.         SRCARCH := x86
  32. endif
  33. ifeq ($(ARCH),x86_64)
  34.         SRCARCH := x86
  35. endif
  37. # Additional ARCH settings for sparc
  38. ifeq ($(ARCH),sparc32)
  39.        SRCARCH := sparc
  40. endif
  41. ifeq ($(ARCH),sparc64)
  42.        SRCARCH := sparc
  43. endif
  45. # Additional ARCH settings for sh
  46. ifeq ($(ARCH),sh64)
  47.        SRCARCH := sh
  48. endif
  50. # Additional ARCH settings for tile
  51. ifeq ($(ARCH),tilepro)
  52.        SRCARCH := tile
  53. endif
  54. ifeq ($(ARCH),tilegx)
  55.        SRCARCH := tile
  56. endif
  58. # Where to locate arch specific headers
  59. hdr-arch  := $(SRCARCH)
  61. KCONFIG_CONFIG  ?= .config
  62. export KCONFIG_CONFIG
  64. # SHELL used by kbuild
  65. CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  66.       else if [ -x /bin/bash ]; then echo /bin/bash; \
  67.       else echo sh; fi ; fi)
  69. HOSTCC       = gcc
  70. HOSTCXX      = g++
  71. HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
  72. HOSTCXXFLAGS = -O2
  74. # 查看$(HOSTCC)中是否时clang version 并统计行数，然后增加编译选项，这些选项可以自行查找什么含义
  75. ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
  76. HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
  77.         -Wno-missing-field-initializers -fno-delete-null-pointer-checks
  78. endif
  80. # Decide whether to build built-in, modular, or both.
  81. # Normally, just do built-in.
  83. KBUILD_MODULES :=
  84. KBUILD_BUILTIN := 1
  86. # If we have only "make modules", don't compile built-in objects.
  87. # When we're building modules with modversions, we need to consider
  88. # the built-in objects during the descend as well, in order to
  89. # make sure the checksums are up to date before we record them.
  91. ifeq ($(MAKECMDGOALS),modules)
  92.   KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  93. endif
  95. # If we have "make <whatever> modules", compile modules
  96. # in addition to whatever we do anyway.
  97. # Just "make" or "make all" shall build modules as well
  99. ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  100.   KBUILD_MODULES := 1
  101. endif
  103. ifeq ($(MAKECMDGOALS),)
  104.   KBUILD_MODULES := 1
  105. endif
  107. export KBUILD_MODULES KBUILD_BUILTIN
  108. export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
  110. # We need some generic definitions (do not try to remake the file).
  111. scripts/Kbuild.include: ;
  112. include scripts/Kbuild.include
  114. # Make variables (CC, etc...)
  115. AS      = $(CROSS_COMPILE)as
  116. LD		= $(CROSS_COMPILE)ld
  117. CC      = $(CROSS_COMPILE)gcc
  118. CPP		= $(CC) -E
  119. AR      = $(CROSS_COMPILE)ar
  120. NM		= $(CROSS_COMPILE)nm
  121. STRIP       = $(CROSS_COMPILE)strip
  122. OBJCOPY		= $(CROSS_COMPILE)objcopy
  123. OBJDUMP     = $(CROSS_COMPILE)objdump
  124. AWK     = awk
  125. GENKSYMS    = scripts/genksyms/genksyms
  126. INSTALLKERNEL  := installkernel
  127. DEPMOD      = /sbin/depmod
  128. PERL        = perl
  129. PYTHON      = python
  130. CHECK       = sparse
  132. CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
  133.           -Wbitwise -Wno-return-void $(CF)
  134. CFLAGS_MODULE   =
  135. AFLAGS_MODULE   =
  136. LDFLAGS_MODULE  =
  137. CFLAGS_KERNEL   =
  138. AFLAGS_KERNEL   =
  139. CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
  142. # Use USERINCLUDE when you must reference the UAPI directories only.
  143. USERINCLUDE    := \
  144.         -I$(srctree)/arch/$(hdr-arch)/include/uapi \
  145.         -Iarch/$(hdr-arch)/include/generated/uapi \
  146. 		-I$(srctree)/include/uapi \
  147.         -Iinclude/generated/uapi \
  148.                 -include $(srctree)/include/linux/kconfig.h
  150. # Use LINUXINCLUDE when you must reference the include/ directory.
  151. # Needed to be compatible with the O= option
  152. LINUXINCLUDE    := \
  153.         -I$(srctree)/arch/$(hdr-arch)/include \
  154.         -Iarch/$(hdr-arch)/include/generated/uapi \
  155. 		-Iarch/$(hdr-arch)/include/generated \
  156.         $(if $(KBUILD_SRC), -I$(srctree)/include) \
  157. 		-Iinclude \
  158. 		$(USERINCLUDE)
  160. KBUILD_CPPFLAGS := -D__KERNEL__
  162. KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
  163.            -fno-strict-aliasing -fno-common \
  164.            -Werror-implicit-function-declaration \
  165.            -Wno-format-security \
  166.            -std=gnu89 $(call cc-option,-fno-PIE)
  169. KBUILD_AFLAGS_KERNEL :=
  170. KBUILD_CFLAGS_KERNEL :=
  171. KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
  172. KBUILD_AFLAGS_MODULE  := -DMODULE
  173. KBUILD_CFLAGS_MODULE  := -DMODULE
  174. KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
  176. # Read KERNELRELEASE from include/config/kernel.release (if it exists)
  177. KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
  178. KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
  180. export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
  181. export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
  182. export CPP AR NM STRIP OBJCOPY OBJDUMP
  183. export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
  184. export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
  186. export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
  187. export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
  188. export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
  189. export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
  190. export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
  191. export KBUILD_ARFLAGS
  193. # When compiling out-of-tree modules, put MODVERDIR in the module
  194. # tree rather than in the kernel tree. The kernel tree might
  195. # even be read-only.
  196. export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
  198. # Files to ignore in find ... statements
  200. export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
  201.               -name CVS -o -name .pc -o -name .hg -o -name .git \) \
  202.               -prune -o
  203. export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
  204.              --exclude CVS --exclude .pc --exclude .hg --exclude .git
  206. # ===========================================================================
  207. # Rules shared between *config targets and build targets
  209. # Basic helpers built in scripts/
  210. # 这里的=不要认为时赋值操作  这个$(build)变量定义来自Kbuild.include,这个文件也是在上面包含进来的
  211. PHONY += scripts_basic
  212. scripts_basic:
  213. 	$(Q)$(MAKE) $(build)=scripts/basic
  214.     $(Q)rm -f .tmp_quiet_recordmcount
  216. # To avoid any implicit rule to kick in, define an empty command.
  217. scripts/basic/%: scripts_basic ;
  219. PHONY += outputmakefile
  220. # outputmakefile generates a Makefile in the output directory, if using a
  221. # separate output directory. This allows convenient use of make in the
  222. # output directory.
  223. outputmakefile:
  224. ifneq ($(KBUILD_SRC),)
  225. 	$(Q)ln -fsn $(srctree) source
  226. 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
  227.         $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
  228. endif
  230. # Support for using generic headers in asm-generic
  231. PHONY += asm-generic
  232. asm-generic:
  233.     $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  234. 	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
  235.     $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  236. 	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
  238. # To make sure we do not include .config for any of the *config targets
  239. # catch them early, and hand them over to scripts/kconfig/Makefile
  240. # It is allowed to specify more targets when calling make, including
  241. # mixing *config targets and build targets.
  242. # For example 'make oldconfig all'.
  243. # Detect when mixed targets is specified, and make a second invocation
  244. # of make so .config is not included in this case either (for *config).
  246. version_h := include/generated/uapi/linux/version.h
  247. old_version_h := include/linux/version.h
  249. no-dot-config-targets := clean mrproper distclean \
  250.              cscope gtags TAGS tags help% %docs check% coccicheck \
  251.              $(version_h) headers_% archheaders archscripts \
  252.              kernelversion %src-pkg
  254. config-targets := 0
  255. mixed-targets  := 0
  256. dot-config     := 1
  258. ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  259. 	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  260.         dot-config := 0
  261.     endif
  262. endif
  264. ifeq ($(KBUILD_EXTMOD),)
  265.         ifneq ($(filter config %config,$(MAKECMDGOALS)),)
  266.                 config-targets := 1
  267.                 ifneq ($(words $(MAKECMDGOALS)),1)
  268.                         mixed-targets := 1
  269.                 endif
  270.         endif
  271. endif
  272. # install and module_install need also be processed one by one
  273. ifneq ($(filter install,$(MAKECMDGOALS)),)
  274.         ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
  275.             mixed-targets := 1
  276.         endif
  277. endif
  279. ifeq ($(mixed-targets),1)
  280. # ===========================================================================
  281. # We're called with mixed targets (*config and build targets).
  282. # Handle them one by one.
  284. PHONY += $(MAKECMDGOALS) __build_one_by_one
  286. $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
  287.     @:
  289. __build_one_by_one:
  290.     $(Q)set -e; \
  291. 	for i in $(MAKECMDGOALS); do \
  292.         $(MAKE) -f $(srctree)/Makefile $$i; \
  293.     done
  295. else
  296. ifeq ($(config-targets),1)
  297. # ===========================================================================
  298. # *config targets only - make sure prerequisites are updated, and descend
  299. # in scripts/kconfig to make the *config target
  301. # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
  302. # KBUILD_DEFCONFIG may point out an alternative default configuration
  303. # used for 'make defconfig'
  305. # 这里是设置make menuconfig的还有make config
  306. include arch/$(SRCARCH)/Makefile
  307. export KBUILD_DEFCONFIG KBUILD_KCONFIG
  309. config: scripts_basic outputmakefile FORCE
  310.     $(Q)$(MAKE) $(build)=scripts/kconfig $@
  312. %config: scripts_basic outputmakefile FORCE
  313.     $(Q)$(MAKE) $(build)=scripts/kconfig $@
  315. else
  316. # ===========================================================================
  317. # Build targets only - this includes vmlinux, arch specific targets, clean
  318. # targets and others. In general all targets except *config targets.
  320. ifeq ($(KBUILD_EXTMOD),)
  321. # Additional helpers built in scripts/
  322. # Carefully list dependencies so we do not try to build scripts twice
  323. # in parallel
  324. # Makefile中的等号，在目标中可以起到连接字符串的操作  $(build)=$(@) 表示的就是-f $(srctree)/scripts/Makefile.build obj=$(@)
  325. PHONY += scripts
  326. scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
  327. 	 asm-generic
  328. 	$(Q)$(MAKE) $(build)=$(@)
  330. # Objects we will link into vmlinux / subdirs we need to visit
  331. # := 表示的时立即展开
  332. init-y      := init/
  333. drivers-y   := drivers/ sound/ firmware/
  334. net-y       := net/
  335. libs-y      := lib/
  336. core-y      := usr/
  337. virt-y      := virt/
  338. endif # KBUILD_EXTMOD
  340. ifeq ($(dot-config),1)
  341. # Read in config
  342. -include include/config/auto.conf
  344. ifeq ($(KBUILD_EXTMOD),)
  345. # Read in dependencies to all Kconfig* files, make sure to run
  346. # oldconfig if changes are detected.
  347. -include include/config/auto.conf.cmd

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