• OpenWrt KernelPackage分析

    一. 前言

            KernelPackage是OpenWrt用来编译内核模块的函数，其实KernelPackage后面会调用BuildPackage，这里会一块将BuildPackage也顺便分析，本文以gpio-button-hotplug驱动模块为例，讲解整个编译过程。

            gpio-button-hotplug驱动编译命令如下：

    make package/kernel/gpio-button-hotplug/compile V=s

    二. 编译过程分析

    1. 编译命令运行分析

            由前面的文章介绍了subdir的作用后，我们可以知道，subdir会将make package/kernel/gpio-button-hotplug/compile V=s命令转换为如下命令：

    make -C package/kernel/gpio-button-hotplug compile

            make会去到package/kernel/gpio-button-hotplug下找Makfile，并且找其中的compile目标运行，gpio-button-hotplug的Makefile如下：

    1. include $(TOPDIR)/rules.mk
    2. include $(INCLUDE_DIR)/kernel.mk
    3.  
    4. PKG_NAME:=gpio-button-hotplug
    5. PKG_RELEASE:=3
    6. PKG_LICENSE:=GPL-2.0
    7.  
    8. include $(INCLUDE_DIR)/package.mk
    9.  
    10. define KernelPackage/gpio-button-hotplug
    11. ......
    12. endef
    13. ......
    14. MAKE_OPTS:= $(KERNEL_MAKE_FLAGS) M="$(PKG_BUILD_DIR)"
    15.  
    16. define Build/Compile
    17. 	$(MAKE) -C "$(LINUX_DIR)" $(MAKE_OPTS) modules
    18. endef
    19.  
    20. $(eval $(call KernelPackage,gpio-button-hotplug))

            可以看到，这里会调用到KernelPackage，KernelPackage内容如下：

    1. include/kernel.mk:
    2. define KernelPackage
    3.   NAME:=$(1)
    4.   $(eval $(call Package/Default))
    5.   $(eval $(call KernelPackage/Defaults))
    6.   $(eval $(call KernelPackage/$(1)))
    7.   $(eval $(call KernelPackage/$(1)/$(BOARD)))
    8.   $(eval $(call KernelPackage/$(1)/$(BOARD)/$(if $(SUBTARGET),$(SUBTARGET),generic)))
    9.  
    10.   define Package/kmod-$(1)
    11.     TITLE:=$(TITLE)
    12.     SECTION:=kernel
    13.     CATEGORY:=Kernel modules
    14.     DESCRIPTION:=$(DESCRIPTION)
    15.     EXTRA_DEPENDS:=kernel (=$(LINUX_VERSION)-$(LINUX_RELEASE)-$(LINUX_VERMAGIC))
    16.     VERSION:=$(LINUX_VERSION)$(if $(PKG_VERSION),+$(PKG_VERSION))-$(if $(PKG_RELEASE),$(PKG_RELEASE),$(LINUX_RELEASE))
    17.     PKGFLAGS:=$(PKGFLAGS)
    18.     $(call KernelPackage/$(1))
    19.     $(call KernelPackage/$(1)/$(BOARD))
    20.     $(call KernelPackage/$(1)/$(BOARD)/$(if $(SUBTARGET),$(SUBTARGET),generic))
    21.   endef
    22.  
    23.   ifdef KernelPackage/$(1)/conffiles
    24.     define Package/kmod-$(1)/conffiles
    25. $(call KernelPackage/$(1)/conffiles)
    26.     endef
    27.   endif
    28.  
    29.   ifdef KernelPackage/$(1)/description
    30.     define Package/kmod-$(1)/description
    31. $(call KernelPackage/$(1)/description)
    32.     endef
    33.   endif
    34.  
    35.   ifdef KernelPackage/$(1)/config
    36.     define Package/kmod-$(1)/config
    37. $(call KernelPackage/$(1)/config)
    38.     endef
    39.   endif
    40.  
    41.   $(call KernelPackage/depends)
    42.   $(call KernelPackage/hooks)
    43.  
    44.   ifneq ($(if $(filter-out %=y %=n %=m,$(KCONFIG)),$(filter m y,$(foreach c,$(filter-out %=y %=n %=m,$(KCONFIG)),$($(c)))),.),)
    45.     define Package/kmod-$(1)/install
    46. 		  @for mod in $$(call version_filter,$$(FILES)); do \
    47. 			if grep -q "$$$$$$$${mod##$(LINUX_DIR)/}" "$(LINUX_DIR)/modules.builtin"; then \
    48. 				echo "<<2>>" \
    49. 				echo "NOTICE: module '$$$$$$$$mod' is built-in."; \
    50. 			elif [ -e $$$$$$$$mod ]; then \
    51. 				echo "<<3>> $$$$$$$$mod" ; \
    52. 				mkdir -p $$(1)/$(MODULES_SUBDIR) ; \
    53. 				$(CP) -L $$$$$$$$mod $$(1)/$(MODULES_SUBDIR)/ ; \
    54. 			else \
    55. 				echo "ERROR: module '$$$$$$$$mod' is missing." >&2; \
    56. 				exit 1; \
    57. 			fi; \
    58. 		  done;
    59. 		  $(call ModuleAutoLoad,$(1),$$(1),$(filter-out 0-,$(word 1,$(AUTOLOAD))-),$(filter-out 0,$(word 2,$(AUTOLOAD))),$(sort $(wordlist 3,99,$(AUTOLOAD))))
    60. 		  $(call KernelPackage/$(1)/install,$$(1))
    61.     endef
    62.   $(if $(CONFIG_PACKAGE_kmod-$(1)),
    63.     else
    64.       compile: $(1)-disabled
    65.       $(1)-disabled:
    66. 		@echo "WARNING: kmod-$(1) is not available in the kernel config - generating empty package" >&2
    67.  
    68.       define Package/kmod-$(1)/install
    69. 		echo "<<1>>"
    70. 		true
    71.       endef
    72.   )
    73.   endif
    74.   $$(eval $$(call BuildPackage,kmod-$(1)))
    75.  
    76.   $$(IPKG_kmod-$(1)): $$(wildcard $$(call version_filter,$$(FILES)))
    77.  
    78. endef

            细节先不分析，先找compile目标，可以看到KernelPackage下没有compile目标，原因如下：

    ifneq ($(if $(filter-out %=y %=n %=m,$(KCONFIG)),$(filter m y,$(foreach c,$(filter-out %=y %=n %=m,$(KCONFIG)),$($(c)))),.),)

            如上代码KCONFIG变量（package/kernel/linux/modules/*.mk才有定义）为空，所以以上表达式可以写为ifneq (.,)，结果为真，执行上面的分支，上面分支没有compile目标。

            此时，就要到BuildPackage里面寻找了。BuildPackage代码如下：

    1. define BuildPackage
    2.   $(eval $(Package/Default))
    3.   $(eval $(Package/$(1)))
    4.  
    5. ifdef DESCRIPTION
    6. $$(error DESCRIPTION:= is obsolete, use Package/PKG_NAME/description)
    7. endif
    8.  
    9. ifndef Package/$(1)/description
    10. define Package/$(1)/description
    11. 	$(TITLE)
    12. endef
    13. endif
    14.  
    15.   BUILD_PACKAGES += $(1)
    16.   $(STAMP_PREPARED): $$(if $(QUILT)$(DUMP),,$(call find_library_dependencies,$(1)))
    17.  
    18.   $(foreach FIELD, TITLE CATEGORY SECTION VERSION,
    19.     ifeq ($($(FIELD)),)
    20.       $$(error Package/$(1) is missing the $(FIELD) field)
    21.     endif
    22.   )
    23.  
    24.   $(if $(DUMP), \
    25.     $(if $(CHECK),,$(Dumpinfo/Package)), \
    26.     $(foreach target, \
    27.       $(if $(Package/$(1)/targets),$(Package/$(1)/targets), \
    28.         $(if $(PKG_TARGETS),$(PKG_TARGETS), ipkg) \
    29.       ), $(BuildTarget/$(target)) \
    30.     ) \
    31.   )
    32.   $(if $(PKG_HOST_ONLY),,$(call Build/DefaultTargets,$(1)))
    33. endef

            这里也没有compile目标。我们分析里面如下代码：

    $(if $(DUMP), \
        $(if $(CHECK),,$(Dumpinfo/Package)), \
        $(foreach target, \
          $(if $(Package/$(1)/targets),$(Package/$(1)/targets), \
            $(if $(PKG_TARGETS),$(PKG_TARGETS), ipkg) \
          ), $(BuildTarget/$(target)) \
        ) \
      )

            以上代码不难分析，结果为$(BuildTarget/ipkg)。接下来分析BuildTarget/ipkg，代码如下：

    1. define BuildTarget/ipkg
    2.     ABIV_$(1):=$(call FormatABISuffix,$(1),$(ABI_VERSION))
    3.     PDIR_$(1):=$(call FeedPackageDir,$(1))
    4.     IPKG_$(1):=$$(PDIR_$(1))/$(1)$$(ABIV_$(1))_$(VERSION)_$(PKGARCH).ipk
    5.     IDIR_$(1):=$(PKG_BUILD_DIR)/ipkg-$(PKGARCH)/$(1)
    6.     KEEP_$(1):=$(strip $(call Package/$(1)/conffiles))
    7.  
    8.     ifeq ($(BUILD_VARIANT),$$(if $$(VARIANT),$$(VARIANT),$(BUILD_VARIANT)))
    9.     do_install=
    10.     ifdef Package/$(1)/install
    11.       do_install=yes
    12.     endif
    13.     ifdef Package/$(1)/install-overlay
    14.       do_install=yes
    15.     endif
    16.     ifdef do_install
    17.       ifneq ($(CONFIG_PACKAGE_$(1))$(DEVELOPER),)
    18.         IPKGS += $(1)
    19.         $(_pkg_target)compile: $$(IPKG_$(1)) $(PKG_INFO_DIR)/$(1).provides $(PKG_BUILD_DIR)/.pkgdir/$(1).installed
    20.         prepare-package-install: $$(IPKG_$(1))
    21.         compile: $(STAGING_DIR_ROOT)/stamp/.$(1)_installed
    22.       else
    23.         $(if $(CONFIG_PACKAGE_$(1)),$$(info WARNING: skipping $(1) -- package not selected))
    24.       endif
    25.  
    26.       .PHONY: $(PKG_INSTALL_STAMP).$(1)
    27.       ifeq ($(CONFIG_PACKAGE_$(1)),y)
    28.         compile: $(PKG_INSTALL_STAMP).$(1)
    29.       endif
    30.       $(PKG_INSTALL_STAMP).$(1): prepare-package-install
    31. 		echo "$(1)" >> $(PKG_INSTALL_STAMP)
    32.     else
    33.       $(if $(CONFIG_PACKAGE_$(1)),$$(warning WARNING: skipping $(1) -- package has no install section))
    34.     endif
    35.     endif
    36.  
    37.     DEPENDS:=$(call PKG_FIXUP_DEPENDS,$(1),$(DEPENDS))
    38.     IDEPEND_$(1):=$$(call filter_deps,$$(DEPENDS))
    39.     IDEPEND += $$(patsubst %,$(1):%,$$(IDEPEND_$(1)))
    40.     $(FixupDependencies)
    41.     $(FixupReverseDependencies)
    42.  
    43.     $(eval $(call BuildIPKGVariable,$(1),conffiles))
    44.     $(eval $(call BuildIPKGVariable,$(1),preinst,,1))
    45.     $(eval $(call BuildIPKGVariable,$(1),postinst,-pkg,1))
    46.     $(eval $(call BuildIPKGVariable,$(1),prerm,-pkg,1))
    47.     $(eval $(call BuildIPKGVariable,$(1),postrm,,1))
    48.  
    49.     $(PKG_BUILD_DIR)/.pkgdir/$(1).installed : export PATH=$$(TARGET_PATH_PKG)
    50.     $(PKG_BUILD_DIR)/.pkgdir/$(1).installed: $(STAMP_BUILT)
    51. 	rm -rf $$@ $(PKG_BUILD_DIR)/.pkgdir/$(1)
    52. 	mkdir -p $(PKG_BUILD_DIR)/.pkgdir/$(1)
    53. 	$(call Package/$(1)/install,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    54. 	$(call Package/$(1)/install_lib,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    55. 	touch $$@
    56.  
    57.     $(STAGING_DIR_ROOT)/stamp/.$(1)_installed: $(PKG_BUILD_DIR)/.pkgdir/$(1).installed
    58. 	mkdir -p $(STAGING_DIR_ROOT)/stamp
    59. 	$(if $(ABI_VERSION),echo '$(ABI_VERSION)' | cmp -s - $(PKG_INFO_DIR)/$(1).version || { \
    60. 		echo '$(ABI_VERSION)' > $(PKG_INFO_DIR)/$(1).version; \
    61. 		$(foreach pkg,$(filter-out $(1),$(PROVIDES)), \
    62. 			cp $(PKG_INFO_DIR)/$(1).version $(PKG_INFO_DIR)/$(pkg).version; \
    63. 		) \
    64. 	} )
    65. 	$(call locked,$(CP) $(PKG_BUILD_DIR)/.pkgdir/$(1)/. $(STAGING_DIR_ROOT)/,root-copy)
    66. 	touch $$@
    67.  
    68.     Package/$(1)/DEPENDS := $$(call mergelist,$$(foreach dep,$$(filter-out @%,$$(IDEPEND_$(1))),$$(dep)$$(call GetABISuffix,$$(dep))))
    69.     ifneq ($$(EXTRA_DEPENDS),)
    70.       Package/$(1)/DEPENDS := $$(EXTRA_DEPENDS)$$(if $$(Package/$(1)/DEPENDS),$$(comma) $$(Package/$(1)/DEPENDS))
    71.     endif
    72.  
    73. $(_define) Package/$(1)/CONTROL
    74. Package: $(1)$$(ABIV_$(1))
    75. Version: $(VERSION)
    76. $$(call addfield,Depends,$$(Package/$(1)/DEPENDS)
    77. )$$(call addfield,Conflicts,$$(call mergelist,$(CONFLICTS))
    78. )$$(call addfield,Provides,$$(call mergelist,$$(filter-out $(1)$$(ABIV_$(1)),$(PROVIDES)$$(if $$(ABIV_$(1)), $(1) $(foreach provide,$(PROVIDES),$(provide)$$(ABIV_$(1))))))
    79. )$$(call addfield,Alternatives,$$(call mergelist,$(ALTERNATIVES))
    80. )$$(call addfield,Source,$(SOURCE)
    81. )$$(call addfield,SourceName,$(1)
    82. )$$(call addfield,License,$(LICENSE)
    83. )$$(call addfield,LicenseFiles,$(LICENSE_FILES)
    84. )$$(call addfield,Section,$(SECTION)
    85. )$$(call addfield,Require-User,$(USERID)
    86. )$$(call addfield,SourceDateEpoch,$(PKG_SOURCE_DATE_EPOCH)
    87. )$$(if $$(ABIV_$(1)),ABIVersion: $$(ABIV_$(1))
    88. )$(if $(PKG_CPE_ID),CPE-ID: $(PKG_CPE_ID)
    89. )$(if $(filter hold,$(PKG_FLAGS)),Status: unknown hold not-installed
    90. )$(if $(filter essential,$(PKG_FLAGS)),Essential: yes
    91. )$(if $(MAINTAINER),Maintainer: $(MAINTAINER)
    92. )Architecture: $(PKGARCH)
    93. Installed-Size: 0
    94. $(_endef)
    95.  
    96.     $$(IPKG_$(1)) : export CONTROL=$$(Package/$(1)/CONTROL)
    97.     $$(IPKG_$(1)) : export DESCRIPTION=$$(Package/$(1)/description)
    98.     $$(IPKG_$(1)) : export PATH=$$(TARGET_PATH_PKG)
    99.     $$(IPKG_$(1)) : export PKG_SOURCE_DATE_EPOCH:=$(PKG_SOURCE_DATE_EPOCH)
    100.     $(PKG_INFO_DIR)/$(1).provides $$(IPKG_$(1)): $(STAMP_BUILT) $(INCLUDE_DIR)/package-ipkg.mk
    101. 	@rm -rf $$(IDIR_$(1)); \
    102. 		$$(call remove_ipkg_files,$(1),$$(call opkg_package_files,$(call gen_ipkg_wildcard,$(1))))
    103. 	mkdir -p $(PACKAGE_DIR) $$(IDIR_$(1))/CONTROL $(PKG_INFO_DIR)
    104. 	$(call Package/$(1)/install,$$(IDIR_$(1)))
    105. 	$(if $(Package/$(1)/install-overlay),mkdir -p $(PACKAGE_DIR) $$(IDIR_$(1))/rootfs-overlay)
    106. 	$(call Package/$(1)/install-overlay,$$(IDIR_$(1))/rootfs-overlay)
    107. 	-find $$(IDIR_$(1)) -name 'CVS' -o -name '.svn' -o -name '.#*' -o -name '*~'| $(XARGS) rm -rf
    108. 	@( \
    109. 		find $$(IDIR_$(1)) -name lib\*.so\* -or -name \*.ko | awk -F/ '{ print $$$$NF }'; \
    110. 		for file in $$(patsubst %,$(PKG_INFO_DIR)/%.provides,$$(IDEPEND_$(1))); do \
    111. 			if [ -f "$$$$file" ]; then \
    112. 				cat $$$$file; \
    113. 			fi; \
    114. 		done; $(Package/$(1)/extra_provides) \
    115. 	) | sort -u > $(PKG_INFO_DIR)/$(1).provides
    116. 	$(if $(PROVIDES),@for pkg in $(filter-out $(1),$(PROVIDES)); do cp $(PKG_INFO_DIR)/$(1).provides $(PKG_INFO_DIR)/$$$$pkg.provides; done)
    117. 	$(CheckDependencies)
    118.  
    119. 	$(RSTRIP) $$(IDIR_$(1))
    120.  
    121.     ifneq ($$(CONFIG_IPK_FILES_CHECKSUMS),)
    122. 	(cd $$(IDIR_$(1)); \
    123. 		( \
    124. 			find . -type f \! -path ./CONTROL/\* -exec mkhash sha256 -n \{\} \; 2> /dev/null | \
    125. 			sed 's|\([[:blank:]]\)\./| \1/|' > $$(IDIR_$(1))/CONTROL/files-sha256sum \
    126. 		) || true \
    127. 	)
    128.     endif
    129. 	(cd $$(IDIR_$(1))/CONTROL; \
    130. 		( \
    131. 			echo "$$$$CONTROL"; \
    132. 			printf "Description: "; echo "$$$$DESCRIPTION" | sed -e 's,^[[:space:]]*, ,g'; \
    133. 		) > control; \
    134. 		chmod 644 control; \
    135. 		( \
    136. 			echo "#!/bin/sh"; \
    137. 			echo "[ \"\$$$${IPKG_NO_SCRIPT}\" = \"1\" ] && exit 0"; \
    138. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    139. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    140. 			echo "default_postinst \$$$$0 \$$$$@"; \
    141. 		) > postinst; \
    142. 		( \
    143. 			echo "#!/bin/sh"; \
    144. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    145. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    146. 			echo "default_prerm \$$$$0 \$$$$@"; \
    147. 		) > prerm; \
    148. 		chmod 0755 postinst prerm; \
    149. 		$($(1)_COMMANDS) \
    150. 	)
    151.  
    152.     ifneq ($$(KEEP_$(1)),)
    153. 		@( \
    154. 			keepfiles=""; \
    155. 			for x in $$(KEEP_$(1)); do \
    156. 				[ -f "$$(IDIR_$(1))/$$$$x" ] || keepfiles="$$$${keepfiles:+$$$$keepfiles }$$$$x"; \
    157. 			done; \
    158. 			[ -z "$$$$keepfiles" ] || { \
    159. 				mkdir -p $$(IDIR_$(1))/lib/upgrade/keep.d; \
    160. 				for x in $$$$keepfiles; do echo $$$$x >> $$(IDIR_$(1))/lib/upgrade/keep.d/$(1); done; \
    161. 			}; \
    162. 		)
    163.     endif
    164.  
    165. 	$(INSTALL_DIR) $$(PDIR_$(1))
    166. 	$(FAKEROOT) $(SCRIPT_DIR)/ipkg-build -m "$(FILE_MODES)" $$(IDIR_$(1)) $$(PDIR_$(1))
    167. 	@[ -f $$(IPKG_$(1)) ]
    168.  
    169.     $(1)-clean:
    170. 	$$(call remove_ipkg_files,$(1),$$(call opkg_package_files,$(call gen_ipkg_wildcard,$(1))))
    171.  
    172.     clean: $(1)-clean
    173.  
    174.   endef

            里面一段一段分析，如下：

    ifeq ($(BUILD_VARIANT),

    (if" role="presentation" style="text-align: center; position: relative;">(if
    (VARIANT),$$(VARIANT),$(BUILD_VARIANT)))
        do_install=
        ifdef Package/$(1)/install
          do_install=yes
        endif
        ifdef Package/$(1)/install-overlay
          do_install=yes
        endif
        ifdef do_install
          ifneq ($(CONFIG_PACKAGE_$(1))$(DEVELOPER),)
            IPKGS += $(1)
            $(_pkg_target)compile:
    (IPKG$(1))$(PKGINFODIR)/$(1).provides$(PKGBUILDDIR)/.pkgdir/$(1).installedprepare−package−install:" role="presentation" style="position: relative;">(IPKG$(1))$(PKGINFODIR)/$(1).provides$(PKGBUILDDIR)/.pkgdir/$(1).installedprepare−package−install:
    (IPKG_$(1))
            compile: $(STAGING_DIR_ROOT)/stamp/.$(1)_installed
          else
            $(if $(CONFIG_PACKAGE_$(1)),$$(info WARNING: skipping $(1) -- package not selected))
          endif

          .PHONY: $(PKG_INSTALL_STAMP).$(1)
          ifeq ($(CONFIG_PACKAGE_$(1)),y)
            compile: $(PKG_INSTALL_STAMP).$(1)
          endif
          $(PKG_INSTALL_STAMP).$(1): prepare-package-install
            echo "$(1)" >> $(PKG_INSTALL_STAMP)
        else
          $(if $(CONFIG_PACKAGE_$(1)),$$(warning WARNING: skipping $(1) -- package has no install section))
        endif
        endif

            由于BUILD_VARIANT和VARIANT都未定义，都为空，自然相等，所以条件成立。

    由于Package/$(1)/install定义在include/kernel.mk中，如下：

    1. include/kernel.mk:
    2. define Package/kmod-$(1)/install
    3. 		  @for mod in $$(call version_filter,$$(FILES)); do \
    4. 			if grep -q "$$$$$$$${mod##$(LINUX_DIR)/}" "$(LINUX_DIR)/modules.builtin"; then \
    5. 				echo "NOTICE: module '$$$$$$$$mod' is built-in."; \
    6. 			elif [ -e $$$$$$$$mod ]; then \
    7. 				mkdir -p $$(1)/$(MODULES_SUBDIR) ; \
    8. 				$(CP) -L $$$$$$$$mod $$(1)/$(MODULES_SUBDIR)/ ; \
    9. 			else \
    10. 				echo "ERROR: module '$$$$$$$$mod' is missing." >&2; \
    11. 				exit 1; \
    12. 			fi; \
    13. 		  done;
    14. 		  $(call ModuleAutoLoad,$(1),$$(1),$(filter-out 0-,$(word 1,$(AUTOLOAD))-),$(filter-out 0,$(word 2,$(AUTOLOAD))),$(sort $(wordlist 3,99,$(AUTOLOAD))))
    15. 		  $(call KernelPackage/$(1)/install,$$(1))
    16.     endef

            所以do_install变量的值是yes。以上的结果可以通过$(warning $(Package/$(1)/install))打印出来证实。

            由于，do_install=yes，此时，可以找到compile目标了，这里有两个compile目标，两个compile目标会依次运行，compile目标和为什么这么运行的例子如下：

    1. include/package-ipkg.mk:
    2. compile: $(STAGING_DIR_ROOT)/stamp/.$(1)_installed
    3. ......
    4. compile: $(PKG_INSTALL_STAMP).$(1)
    5.  
    6. example：
    7. act1:
    8.         @echo act1;
    9. act2:
    10.         @echo act2;
    11.  
    12. compile: act1
    13. compile: act2
    14.  
    15. all: compile
    16.         @echo all
    17.  
    18. result：
    19. act1
    20. act2
    21. all
    2. 先来分析第一个compile目标

     $(STAGING_DIR_ROOT)/stamp/.$(1)_installed依赖于$(PKG_BUILD_DIR)/.pkgdir/$(1).installed，实现如下：

    1. include/package-ipkg.mk:
    2. $(STAGING_DIR_ROOT)/stamp/.$(1)_installed: $(PKG_BUILD_DIR)/.pkgdir/$(1).installed
    3. 	mkdir -p $(STAGING_DIR_ROOT)/stamp
    4. 	$(if $(ABI_VERSION),echo '$(ABI_VERSION)' | cmp -s - $(PKG_INFO_DIR)/$(1).version || { \
    5. 		echo '$(ABI_VERSION)' > $(PKG_INFO_DIR)/$(1).version; \
    6. 		$(foreach pkg,$(filter-out $(1),$(PROVIDES)), \
    7. 			cp $(PKG_INFO_DIR)/$(1).version $(PKG_INFO_DIR)/$(pkg).version; \
    8. 		) \
    9. 	} )
    10. 	$(call locked,$(CP) $(PKG_BUILD_DIR)/.pkgdir/$(1)/. $(STAGING_DIR_ROOT)/,root-copy)
    11. 	touch $$@

            $(PKG_BUILD_DIR)/.pkgdir/$(1).installed依赖于STAMP_BUILT，实现如下：

    1. include/package-ipkg.mk:
    2. $(PKG_BUILD_DIR)/.pkgdir/$(1).installed: $(STAMP_BUILT)
    3. 	rm -rf $$@ $(PKG_BUILD_DIR)/.pkgdir/$(1)
    4. 	mkdir -p $(PKG_BUILD_DIR)/.pkgdir/$(1)
    5. 	$(call Package/$(1)/install,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    6. 	$(call Package/$(1)/install_lib,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    7. 	touch $$@

            STAMP_BUILT定义在Build/CoreTargets，Build/CoreTargets实现如下：

    1. include/package.mk:
    2. define Build/CoreTargets
    3.   STAMP_PREPARED:=$$(STAMP_PREPARED)
    4.   STAMP_CONFIGURED:=$$(STAMP_CONFIGURED)
    5.  
    6.   $(if $(QUILT),$(Build/Quilt))
    7.   $(call Build/Autoclean)
    8.   $(call DefaultTargets)
    9.  
    10.   $(DL_DIR)/$(FILE): FORCE
    11.  
    12.   download:
    13. 	$(foreach hook,$(Hooks/Download),
    14. 		$(call $(hook))$(sep)
    15. 	)
    16.  
    17.   $(STAMP_PREPARED) : export PATH=$$(TARGET_PATH_PKG)
    18.   $(STAMP_PREPARED): $(STAMP_PREPARED_DEPENDS)
    19. 	@-rm -rf $(PKG_BUILD_DIR)
    20. 	@mkdir -p $(PKG_BUILD_DIR)
    21. 	touch $$@_check
    22. 	$(foreach hook,$(Hooks/Prepare/Pre),$(call $(hook))$(sep))
    23. 	$(Build/Prepare)
    24. 	$(foreach hook,$(Hooks/Prepare/Post),$(call $(hook))$(sep))
    25. 	touch $$@
    26.  
    27.   $(call Build/Exports,$(STAMP_CONFIGURED))
    28.   $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(STAMP_CONFIGURED_DEPENDS)
    29. 	rm -f $(STAMP_CONFIGURED_WILDCARD)
    30. 	$(CleanStaging)
    31. 	$(foreach hook,$(Hooks/Configure/Pre),$(call $(hook))$(sep))
    32. 	$(Build/Configure)
    33. 	$(foreach hook,$(Hooks/Configure/Post),$(call $(hook))$(sep))
    34. 	touch $$@
    35.  
    36.   $(call Build/Exports,$(STAMP_BUILT))
    37.   $(STAMP_BUILT): $(STAMP_CONFIGURED) $(STAMP_BUILT_DEPENDS)
    38. 	rm -f $$@
    39. 	touch $$@_check
    40. 	$(foreach hook,$(Hooks/Compile/Pre),$(call $(hook))$(sep))
    41. 	$(Build/Compile)
    42. 	$(foreach hook,$(Hooks/Compile/Post),$(call $(hook))$(sep))
    43. 	$(Build/Install)
    44. 	$(foreach hook,$(Hooks/Install/Post),$(call $(hook))$(sep))
    45. 	touch $$@
    46.  
    47.   $(STAMP_INSTALLED) : export PATH=$$(TARGET_PATH_PKG)
    48.   $(STAMP_INSTALLED): $(STAMP_BUILT)
    49. 	rm -rf $(TMP_DIR)/stage-$(PKG_DIR_NAME)
    50. 	mkdir -p $(TMP_DIR)/stage-$(PKG_DIR_NAME)/host $(STAGING_DIR)/packages
    51. 	$(foreach hook,$(Hooks/InstallDev/Pre),\
    52. 		$(call $(hook),$(TMP_DIR)/stage-$(PKG_DIR_NAME),$(TMP_DIR)/stage-$(PKG_DIR_NAME)/host)$(sep)\
    53. 	)
    54. 	$(call Build/InstallDev,$(TMP_DIR)/stage-$(PKG_DIR_NAME),$(TMP_DIR)/stage-$(PKG_DIR_NAME)/host)
    55. 	$(foreach hook,$(Hooks/InstallDev/Post),\
    56. 		$(call $(hook),$(TMP_DIR)/stage-$(PKG_DIR_NAME),$(TMP_DIR)/stage-$(PKG_DIR_NAME)/host)$(sep)\
    57. 	)
    58. 	if [ -f $(STAGING_DIR)/packages/$(STAGING_FILES_LIST) ]; then \
    59. 		$(SCRIPT_DIR)/clean-package.sh \
    60. 			"$(STAGING_DIR)/packages/$(STAGING_FILES_LIST)" \
    61. 			"$(STAGING_DIR)"; \
    62. 	fi
    63. 	if [ -d $(TMP_DIR)/stage-$(PKG_DIR_NAME) ]; then \
    64. 		(cd $(TMP_DIR)/stage-$(PKG_DIR_NAME); find ./ > $(TMP_DIR)/stage-$(PKG_DIR_NAME).files); \
    65. 		$(call locked, \
    66. 			mv $(TMP_DIR)/stage-$(PKG_DIR_NAME).files $(STAGING_DIR)/packages/$(STAGING_FILES_LIST) && \
    67. 			$(CP) $(TMP_DIR)/stage-$(PKG_DIR_NAME)/* $(STAGING_DIR)/; \
    68. 		,staging-dir); \
    69. 	fi
    70. 	rm -rf $(TMP_DIR)/stage-$(PKG_DIR_NAME)
    71. 	touch $$@
    72.  
    73.   ifdef Build/InstallDev
    74.     $(_pkg_target)compile: $(STAMP_INSTALLED)
    75.   endif
    76.  
    77.   $(_pkg_target)prepare: $(STAMP_PREPARED)
    78.   $(_pkg_target)configure: $(STAMP_CONFIGURED)
    79.   $(_pkg_target)dist: $(STAMP_CONFIGURED)
    80.   $(_pkg_target)distcheck: $(STAMP_CONFIGURED)
    81.  
    82.   ifneq ($(CONFIG_AUTOREMOVE),)
    83.     compile:
    84. 		-touch -r $(PKG_BUILD_DIR)/.built $(PKG_BUILD_DIR)/.autoremove 2>/dev/null >/dev/null
    85. 		$(FIND) $(PKG_BUILD_DIR) -mindepth 1 -maxdepth 1 -not '(' -type f -and -name '.*' -and -size 0 ')' -and -not -name '.pkgdir' | \
    86. 			$(XARGS) rm -rf
    87.   endif
    88. endef
    89.  
    90.  
    91. define Build/DefaultTargets
    92.   $(if $(USE_SOURCE_DIR)$(USE_GIT_TREE)$(USE_GIT_SRC_CHECKOUT),,$(if $(strip $(PKG_SOURCE_URL)),$(call Download,default)))
    93.   $(if $(DUMP),,$(Build/CoreTargets))
    94.  
    95.   define Build/DefaultTargets
    96.   endef
    97. endef
    98.  
    99. define BuildPackage
    100. ......
    101.  
    102.   $(if $(PKG_HOST_ONLY),,$(call Build/DefaultTargets,$(1)))
    103. endef

    其中

    $(STAMP_BUILT): $(STAMP_CONFIGURED) $(STAMP_BUILT_DEPENDS)
        rm -f

    @touch" role="presentation" style="text-align: center; position: relative;">@touch
    @_check
        $(foreach hook,$(Hooks/Compile/Pre),$(call $(hook))$(sep))
        $(Build/Compile)
        $(foreach hook,$(Hooks/Compile/Post),$(call $(hook))$(sep))
        $(Build/Install)
        $(foreach hook,$(Hooks/Install/Post),$(call $(hook))$(sep))
        touch $$@

            STAMP_BUILT依赖于STAMP_CONFIGURED和STAMP_BUILT_DEPENDS，STAMP_CONFIGURED实现如下：

    $(STAMP_CONFIGURED): $(STAMP_PREPARED) $(STAMP_CONFIGURED_DEPENDS)
        rm -f $(STAMP_CONFIGURED_WILDCARD)
        $(CleanStaging)
        $(foreach hook,$(Hooks/Configure/Pre),$(call $(hook))$(sep))
        $(Build/Configure)
        $(foreach hook,$(Hooks/Configure/Post),$(call $(hook))$(sep))
        touch $$@

            STAMP_CONFIGURED依赖于STAMP_PREPARED，STAMP_PREPARED实现如下：

    (STAMP_PREPARED) : export PATH=

    (TARGETPATHPKG)$(STAMPPREPARED):$(STAMPPREPAREDDEPENDS)@−rm−rf$(PKGBUILDDIR)@mkdir−p$(PKGBUILDDIR)touch" role="presentation" style="position: relative;">(TARGETPATHPKG)$(STAMPPREPARED):$(STAMPPREPAREDDEPENDS)@−rm−rf$(PKGBUILDDIR)@mkdir−p$(PKGBUILDDIR)touch
    @_check
        $(foreach hook,$(Hooks/Prepare/Pre),$(call $(hook))$(sep))
        $(Build/Prepare)
        $(foreach hook,$(Hooks/Prepare/Post),$(call $(hook))$(sep))
        touch $$@

            经过这几个步骤，kmod-*.ipkg的代码就编译好了。步骤分别是BUild/Prepare，CleanStaging，Build/Configure，Build/Compile和Build/Install。

            在之后，执行如下代码

    1. include/package-ipkg.mk:
    2. $(PKG_BUILD_DIR)/.pkgdir/$(1).installed : export PATH=$$(TARGET_PATH_PKG)
    3.     $(PKG_BUILD_DIR)/.pkgdir/$(1).installed: $(STAMP_BUILT)
    4. 	rm -rf $$@ $(PKG_BUILD_DIR)/.pkgdir/$(1)
    5. 	mkdir -p $(PKG_BUILD_DIR)/.pkgdir/$(1)
    6. 	$(call Package/$(1)/install,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    7. 	$(call Package/$(1)/install_lib,$(PKG_BUILD_DIR)/.pkgdir/$(1))
    8. 	touch $$@

           实际运行代码：

    1. rm -rf /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug.installed /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug
    2. mkdir -p /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug
    3. mkdir -p /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug/etc/modules.d; ( echo "gpio-button-hotplug"; ) > /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug/etc/modules.d/30-gpio-button-hotplug;  mkdir -p /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug/etc/modules-boot.d; ln -sf ../modules.d/30-gpio-button-hotplug /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug/etc/modules-boot.d/;
    4. touch /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug.installed

            创建build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug.installed文件。

    1. $(STAGING_DIR_ROOT)/stamp/.$(1)_installed: $(PKG_BUILD_DIR)/.pkgdir/$(1).installed
    2. 	mkdir -p $(STAGING_DIR_ROOT)/stamp
    3. 	$(if $(ABI_VERSION),echo '$(ABI_VERSION)' | cmp -s - $(PKG_INFO_DIR)/$(1).version || { \
    4. 		echo '$(ABI_VERSION)' > $(PKG_INFO_DIR)/$(1).version; \
    5. 		$(foreach pkg,$(filter-out $(1),$(PROVIDES)), \
    6. 			cp $(PKG_INFO_DIR)/$(1).version $(PKG_INFO_DIR)/$(pkg).version; \
    7. 		) \
    8. 	} )
    9. 	$(call locked,$(CP) $(PKG_BUILD_DIR)/.pkgdir/$(1)/. $(STAGING_DIR_ROOT)/,root-copy)
    10. 	touch $$@

             执行如下：

    mkdir -p /root/mt7981/openwrt/staging_dir/target-aarch64_cortex-a53_musl/root-mediatek/stamp
    SHELL= flock /root/mt7981/openwrt/tmp/.root-copy.flock -c 'cp -fpR /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/.pkgdir/kmod-gpio-button-hotplug/. /root/mt7981/openwrt/staging_dir/target-aarch64_cortex-a53_musl/root-mediatek/'
    touch /root/mt7981/openwrt/staging_dir/target-aarch64_cortex-a53_musl/root-mediatek/stamp/.kmod-gpio-button-hotplug_installed

            至此，第一个compile目标就分析完成了，接下来第二个compile主要是生成ipkg包。

    3. 第二个compile分析

            第二个compile代码如下：

    1. include/package-ipkg.mk:
    2. compile: $(PKG_INSTALL_STAMP).$(1)

            $(PKG_INSTALL_STAMP).$(1)依赖于prepare-package-install，prepare-package-install代码如下：

    1. include/package-ipkg.mk:
    2. prepare-package-install: $$(IPKG_$(1))

            $$(IPKG_$(1))的定义如下：

    1. include/package-ipkg.mk:
    2.     $$(IPKG_$(1)) : export CONTROL=$$(Package/$(1)/CONTROL)
    3.     $$(IPKG_$(1)) : export DESCRIPTION=$$(Package/$(1)/description)
    4.     $$(IPKG_$(1)) : export PATH=$$(TARGET_PATH_PKG)
    5.     $$(IPKG_$(1)) : export PKG_SOURCE_DATE_EPOCH:=$(PKG_SOURCE_DATE_EPOCH)
    6.     $(PKG_INFO_DIR)/$(1).provides $$(IPKG_$(1)): $(STAMP_BUILT) $(INCLUDE_DIR)/package-ipkg.mk
    7. 	@rm -rf $$(IDIR_$(1)); \
    8. 		$$(call remove_ipkg_files,$(1),$$(call opkg_package_files,$(call gen_ipkg_wildcard,$(1))))
    9. 	mkdir -p $(PACKAGE_DIR) $$(IDIR_$(1))/CONTROL $(PKG_INFO_DIR)
    10. 	$(call Package/$(1)/install,$$(IDIR_$(1)))
    11. 	$(if $(Package/$(1)/install-overlay),mkdir -p $(PACKAGE_DIR) $$(IDIR_$(1))/rootfs-overlay)
    12. 	$(call Package/$(1)/install-overlay,$$(IDIR_$(1))/rootfs-overlay)
    13. 	-find $$(IDIR_$(1)) -name 'CVS' -o -name '.svn' -o -name '.#*' -o -name '*~'| $(XARGS) rm -rf
    14. 	@( \
    15. 		find $$(IDIR_$(1)) -name lib\*.so\* -or -name \*.ko | awk -F/ '{ print $$$$NF }'; \
    16. 		for file in $$(patsubst %,$(PKG_INFO_DIR)/%.provides,$$(IDEPEND_$(1))); do \
    17. 			if [ -f "$$$$file" ]; then \
    18. 				cat $$$$file; \
    19. 			fi; \
    20. 		done; $(Package/$(1)/extra_provides) \
    21. 	) | sort -u > $(PKG_INFO_DIR)/$(1).provides
    22. 	$(if $(PROVIDES),@for pkg in $(filter-out $(1),$(PROVIDES)); do cp $(PKG_INFO_DIR)/$(1).provides $(PKG_INFO_DIR)/$$$$pkg.provides; done)
    23. 	$(CheckDependencies)
    24.  
    25. 	$(RSTRIP) $$(IDIR_$(1))
    26.  
    27.     ifneq ($$(CONFIG_IPK_FILES_CHECKSUMS),)
    28. 	(cd $$(IDIR_$(1)); \
    29. 		( \
    30. 			find . -type f \! -path ./CONTROL/\* -exec mkhash sha256 -n \{\} \; 2> /dev/null | \
    31. 			sed 's|\([[:blank:]]\)\./| \1/|' > $$(IDIR_$(1))/CONTROL/files-sha256sum \
    32. 		) || true \
    33. 	)
    34.     endif
    35. 	(cd $$(IDIR_$(1))/CONTROL; \
    36. 		( \
    37. 			echo "$$$$CONTROL"; \
    38. 			printf "Description: "; echo "$$$$DESCRIPTION" | sed -e 's,^[[:space:]]*, ,g'; \
    39. 		) > control; \
    40. 		chmod 644 control; \
    41. 		( \
    42. 			echo "#!/bin/sh"; \
    43. 			echo "[ \"\$$$${IPKG_NO_SCRIPT}\" = \"1\" ] && exit 0"; \
    44. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    45. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    46. 			echo "default_postinst \$$$$0 \$$$$@"; \
    47. 		) > postinst; \
    48. 		( \
    49. 			echo "#!/bin/sh"; \
    50. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    51. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    52. 			echo "default_prerm \$$$$0 \$$$$@"; \
    53. 		) > prerm; \
    54. 		chmod 0755 postinst prerm; \
    55. 		$($(1)_COMMANDS) \
    56. 	)
    57.  
    58.     ifneq ($$(KEEP_$(1)),)
    59. 		@( \
    60. 			keepfiles=""; \
    61. 			for x in $$(KEEP_$(1)); do \
    62. 				[ -f "$$(IDIR_$(1))/$$$$x" ] || keepfiles="$$$${keepfiles:+$$$$keepfiles }$$$$x"; \
    63. 			done; \
    64. 			[ -z "$$$$keepfiles" ] || { \
    65. 				mkdir -p $$(IDIR_$(1))/lib/upgrade/keep.d; \
    66. 				for x in $$$$keepfiles; do echo $$$$x >> $$(IDIR_$(1))/lib/upgrade/keep.d/$(1); done; \
    67. 			}; \
    68. 		)
    69.     endif
    70.  
    71. 	$(INSTALL_DIR) $$(PDIR_$(1))
    72. 	$(FAKEROOT) $(SCRIPT_DIR)/ipkg-build -m "$(FILE_MODES)" $$(IDIR_$(1)) $$(PDIR_$(1))
    73. 	@[ -f $$(IPKG_$(1)) ]

            逐行代码分析，

    1. @rm -rf $$(IDIR_$(1)); \
    2. 		$$(call remove_ipkg_files,$(1),$$(call opkg_package_files,$(call gen_ipkg_wildcard,$(1))))

            这句指令实际执行命令如下：

    rm -rf /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug; 

             删除ipkg目录。

    mkdir -p $(PACKAGE_DIR) $$(IDIR_$(1))/CONTROL $(PKG_INFO_DIR)

            实际执行命令如下：

    mkdir -p /root/mt7981/openwrt/bin/targets/mediatek/mt7981/packages /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/CONTROL /root/mt7981/openwrt/staging_dir/target-aarch64_cortex-a53_musl/pkginfo

            新建ipkg以及其下面的目录。

    $(call Package/$(1)/install,$$(IDIR_$(1)))

            实际执行命令如下：

    mkdir -p /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/etc/modules.d; ( echo "gpio-button-hotplug"; ) > /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/etc/modules.d/30-gpio-button-hotplug;  mkdir -p /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/etc/modules-boot.d; ln -sf ../modules.d/30-gpio-button-hotplug /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/etc/modules-boot.d/;

            其上面的命令都在include/kernel.mk的Package/kmod-$(1)/install中的ModuleAutoLoad实现的。

    1. -find $$(IDIR_$(1)) -name 'CVS' -o -name '.svn' -o -name '.#*' -o -name '*~'| $(XARGS) rm -rf
    2. 	@( \
    3. 		find $$(IDIR_$(1)) -name lib\*.so\* -or -name \*.ko | awk -F/ '{ print $$$$NF }'; \
    4. 		for file in $$(patsubst %,$(PKG_INFO_DIR)/%.provides,$$(IDEPEND_$(1))); do \
    5. 			if [ -f "$$$$file" ]; then \
    6. 				cat $$$$file; \
    7. 			fi; \
    8. 		done; $(Package/$(1)/extra_provides) \
    9. 	) | sort -u > $(PKG_INFO_DIR)/$(1).provides

            实际执行命令如下：

    find /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug -name 'CVS' -o -name '.svn' -o -name '.#*' -o -name '*~'| xargs -r rm -rf

            删除掉ipkg目录下一些无关的文件。

    $(RSTRIP) $$(IDIR_$(1))

            实际执行命令如下：

    export CROSS="aarch64-openwrt-linux-musl-"  NO_RENAME=1 ; NM="aarch64-openwrt-linux-musl-nm" STRIP="/root/mt7981/openwrt/staging_dir/host/bin/sstrip -z" STRIP_KMOD="/root/mt7981/openwrt/scripts/strip-kmod.sh" PATCHELF="/root/mt7981/openwrt/staging_dir/host/bin/patchelf" /root/mt7981/openwrt/scripts/rstrip.sh /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug
    rstrip.sh: /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/lib/modules/5.4.203/gpio-button-hotplug.ko: relocatable

            去掉ipkg中文件的符号表。

    1. (cd $$(IDIR_$(1))/CONTROL; \
    2. 		( \
    3. 			echo "$$$$CONTROL"; \
    4. 			printf "Description: "; echo "$$$$DESCRIPTION" | sed -e 's,^[[:space:]]*, ,g'; \
    5. 		) > control; \
    6. 		chmod 644 control; \
    7. 		( \
    8. 			echo "#!/bin/sh"; \
    9. 			echo "[ \"\$$$${IPKG_NO_SCRIPT}\" = \"1\" ] && exit 0"; \
    10. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    11. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    12. 			echo "default_postinst \$$$$0 \$$$$@"; \
    13. 		) > postinst; \
    14. 		( \
    15. 			echo "#!/bin/sh"; \
    16. 			echo "[ -s "\$$$${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; \
    17. 			echo ". \$$$${IPKG_INSTROOT}/lib/functions.sh"; \
    18. 			echo "default_prerm \$$$$0 \$$$$@"; \
    19. 		) > prerm; \
    20. 		chmod 0755 postinst prerm; \
    21. 		$($(1)_COMMANDS) \
    22. 	)

            实际执行命令如下：

    (cd /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug/CONTROL; ( echo "$CONTROL"; printf "Description: "; echo "$DESCRIPTION" | sed -e 's,^[[:space:]]*, ,g'; ) > control; chmod 644 control; ( echo "#!/bin/sh"; echo "[ \"\${IPKG_NO_SCRIPT}\" = \"1\" ] && exit 0"; echo "[ -s "\${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; echo ". \${IPKG_INSTROOT}/lib/functions.sh"; echo "default_postinst \$0 \$@"; ) > postinst; ( echo "#!/bin/sh"; echo "[ -s "\${IPKG_INSTROOT}/lib/functions.sh" ] || exit 0"; echo ". \${IPKG_INSTROOT}/lib/functions.sh"; echo "default_prerm \$0 \$@"; ) > prerm; chmod 0755 postinst prerm;  )

            生成ipkg下的control，postinst和prerm文件。

    $(INSTALL_DIR) $$(PDIR_$(1))

            实际执行命令如下：

    install -d -m0755 /root/mt7981/openwrt/bin/targets/mediatek/mt7981/packages

            创建bin下的packages目录。

    $(FAKEROOT) $(SCRIPT_DIR)/ipkg-build -m "$(FILE_MODES)" $$(IDIR_$(1)) $$(PDIR_$(1))

             实际执行命令如下：

    /root/mt7981/openwrt/staging_dir/host/bin/fakeroot /root/mt7981/openwrt/scripts/ipkg-build -m "" /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug /root/mt7981/openwrt/bin/targets/mediatek/mt7981/packages
    Packaged contents of /root/mt7981/openwrt/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/gpio-button-hotplug/ipkg-aarch64_cortex-a53/kmod-gpio-button-hotplug into /root/mt7981/openwrt/bin/targets/mediatek/mt7981/packages/kmod-gpio-button-hotplug_5.4.203-3_aarch64_cortex-a53.ipk

            调用ipkg-build命令生成ipkg文件。

    echo "$(1)" >> $(PKG_INSTALL_STAMP)

            实际执行命令如下：

    echo "kmod-gpio-button-hotplug" >> /root/mt7981/openwrt/staging_dir/target-aarch64_cortex-a53_musl/pkginfo/gpio-button-hotplug.default.install

    三. 总结

    1. kmod的ipkg和普通的应用程序的ipkg相同点

            毫无疑问，它们都必须包含ipkg的基本元素，符合ipkg的规范，有CONTROL目录，CONTROL目录下有对应的control，postinst和prerm文件，还有其他的目录，例如内核驱动有etc和lib目录，应用程序有usr目录等等。

            它们都要调用include/package.mk中的BuildPackage，再调用到include/package-ipkg.mk的BuildTarget/ipkg，BuildPackage的子功能定义编译ipkg源代码的一整套流程，Prepare，Configure，Compile和Install步骤，虽然两者区别是其中一个一些步骤会省略（Build/xxx为空），例如，kmod就不需要Configure。

    2. kmod的ipkg和普通的应用程序的ipkg不同点

            编译kmod和普通应用的代码方式不一样。这个就体现在Build/Compile中，kmod的Makefile需要在自己的Makefile中定义这个宏，表示如何编译kmod，而应用代码Build/Compile是不推荐自定义的。

            安装的方式不一样。kmod需要etc/modules.d/这样的目录，而应用程序不需要，在kmod的安装中，include/package-ipkg.mk中$(call Package/$(1)/install,$$(IDIR_$(1)))会调用到include/kernel.mk中的Package/kmod-$(1)/install，而如果再有需要，由于KernelPackage/$(1)/install定义在Package/kmod-$(1)/install，kmod的Makefile可以自定义KernelPackage/$(1)/install，做一些特殊处理。但是普通应用程序要在自己的Makefile中定义Package/$(1)/install，做一些自己需要的操作。

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  • 原文地址：https://blog.csdn.net/to_be_better_wen/article/details/132918659