目录
- Android.bp --> Soong --> Ninja
- Makefile or Android.mk --> kati --> Ninja
最终都是生成Ninja格式文件进行编译。
相关概念：
- ninja是一个编译框架，会根据相应的ninja格式的配置文件进行编译，但是ninja文件一般不会手动修改，而是通过将 Android.bp文件转换成ninja格式文件来编译
- Soong类似于之前的Makefile编译系统的核心，负责提供Android.bp语义解析，并将之转换成Ninja文件。
- Blueprint是生成、解析Android.bp的工具，是Soong的一部分。Soong负责Android编译而设计的工具，而Blueprint只是解析文件格式，Soong解析内容的具体含义。Blueprint和Soong都是由Golang写的项目，从Android 7.0，prebuilts/go/目录下新增Golang所需的运行环境，在编译时使用
- kati是专为Android开发的一个基于Golang和C++的工具，主要功能是把Android.mk文件转换成Ninja文件。代码路径是build/kati/，编译后的产物是ckati
Android.bp的出现就是为了替换Android.mk文件。bp跟mk文件不同，它是纯粹的配置，没有分支、循环等流程控制，不能做算数逻辑运算。如果需要控制逻辑，那么只能通过Go语言编写。旧的mk可以转换为bp，Soong会编译生成一个androidmk命令，用于将Android.mk文件转换为Android.bp文件。只针对简单的mk文件转换，涉及分支，循环等控制转换并不准确。即：
Android.mk --> Soong中androidmk --> Android.bp
直接在"build/soong/androidmk/androidmk/android.go"文件中找：
var moduleTypes = map[string]string{"BUILD_SHARED_LIBRARY": "cc_library_shared","BUILD_STATIC_LIBRARY": "cc_library_static","BUILD_HOST_SHARED_LIBRARY": "cc_library_host_shared","BUILD_HOST_STATIC_LIBRARY": "cc_library_host_static","BUILD_HEADER_LIBRARY": "cc_library_headers","BUILD_EXECUTABLE": "cc_binary","BUILD_HOST_EXECUTABLE": "cc_binary_host","BUILD_NATIVE_TEST": "cc_test","BUILD_HOST_NATIVE_TEST": "cc_test_host","BUILD_NATIVE_BENCHMARK": "cc_benchmark","BUILD_HOST_NATIVE_BENCHMARK": "cc_benchmark_host","BUILD_JAVA_LIBRARY": "java_library_installable", // will be rewritten to java_library by bpfix"BUILD_STATIC_JAVA_LIBRARY": "java_library","BUILD_HOST_JAVA_LIBRARY": "java_library_host","BUILD_HOST_DALVIK_JAVA_LIBRARY": "java_library_host_dalvik","BUILD_PACKAGE": "android_app","BUILD_RRO_PACKAGE": "runtime_resource_overlay","BUILD_CTS_EXECUTABLE": "cc_binary", // will be further massaged by bpfix depending on the output path"BUILD_CTS_SUPPORT_PACKAGE": "cts_support_package", // will be rewritten to android_test by bpfix"BUILD_CTS_PACKAGE": "cts_package", // will be rewritten to android_test by bpfix"BUILD_CTS_TARGET_JAVA_LIBRARY": "cts_target_java_library", // will be rewritten to java_library by bpfix"BUILD_CTS_HOST_JAVA_LIBRARY": "cts_host_java_library", // will be rewritten to java_library_host by bpfix}var prebuiltTypes = map[string]string{"SHARED_LIBRARIES": "cc_prebuilt_library_shared","STATIC_LIBRARIES": "cc_prebuilt_library_static","EXECUTABLES": "cc_prebuilt_binary","JAVA_LIBRARIES": "java_import","APPS": "android_app_import","ETC": "prebuilt_etc",}var rewriteProperties = map[string](func(variableAssignmentContext) error){// custom functions"LOCAL_32_BIT_ONLY": local32BitOnly,"LOCAL_AIDL_INCLUDES": localAidlIncludes,"LOCAL_ASSET_DIR": localizePathList("asset_dirs"),"LOCAL_C_INCLUDES": localIncludeDirs,"LOCAL_EXPORT_C_INCLUDE_DIRS": exportIncludeDirs,"LOCAL_JARJAR_RULES": localizePath("jarjar_rules"),"LOCAL_LDFLAGS": ldflags,"LOCAL_MODULE_CLASS": prebuiltClass,"LOCAL_MODULE_STEM": stem,"LOCAL_MODULE_HOST_OS": hostOs,"LOCAL_RESOURCE_DIR": localizePathList("resource_dirs"),"LOCAL_SANITIZE": sanitize(""),"LOCAL_SANITIZE_DIAG": sanitize("diag."),"LOCAL_STRIP_MODULE": strip(),"LOCAL_CFLAGS": cflags,"LOCAL_UNINSTALLABLE_MODULE": invert("installable"),"LOCAL_PROGUARD_ENABLED": proguardEnabled,"LOCAL_MODULE_PATH": prebuiltModulePath,"LOCAL_REPLACE_PREBUILT_APK_INSTALLED": prebuiltPreprocessed,// composite functions"LOCAL_MODULE_TAGS": includeVariableIf(bpVariable{"tags", bpparser.ListType}, not(valueDumpEquals("optional"))),// skip functions"LOCAL_ADDITIONAL_DEPENDENCIES": skip, // TODO: check for only .mk files?"LOCAL_CPP_EXTENSION": skip,"LOCAL_MODULE_SUFFIX": skip, // TODO"LOCAL_PATH": skip, // Nothing to do, except maybe avoid the "./" in paths?"LOCAL_PRELINK_MODULE": skip, // Already phased out"LOCAL_BUILT_MODULE_STEM": skip,"LOCAL_USE_AAPT2": skip, // Always enabled in Soong"LOCAL_JAR_EXCLUDE_FILES": skip, // Soong never excludes files from jars"LOCAL_ANNOTATION_PROCESSOR_CLASSES": skip, // Soong gets the processor classes from the plugin"LOCAL_CTS_TEST_PACKAGE": skip, // Obsolete"LOCAL_JACK_ENABLED": skip, // Obselete"LOCAL_JACK_FLAGS": skip, // Obselete}func init() {addStandardProperties(bpparser.StringType,map[string]string{"LOCAL_MODULE": "name","LOCAL_CXX_STL": "stl","LOCAL_MULTILIB": "compile_multilib","LOCAL_ARM_MODE_HACK": "instruction_set","LOCAL_SDK_VERSION": "sdk_version","LOCAL_MIN_SDK_VERSION": "min_sdk_version","LOCAL_NDK_STL_VARIANT": "stl","LOCAL_JAR_MANIFEST": "manifest","LOCAL_CERTIFICATE": "certificate","LOCAL_PACKAGE_NAME": "name","LOCAL_MODULE_RELATIVE_PATH": "relative_install_path","LOCAL_PROTOC_OPTIMIZE_TYPE": "proto.type","LOCAL_MODULE_OWNER": "owner","LOCAL_RENDERSCRIPT_TARGET_API": "renderscript.target_api","LOCAL_NOTICE_FILE": "notice","LOCAL_JAVA_LANGUAGE_VERSION": "java_version","LOCAL_INSTRUMENTATION_FOR": "instrumentation_for","LOCAL_MANIFEST_FILE": "manifest","LOCAL_DEX_PREOPT_PROFILE_CLASS_LISTING": "dex_preopt.profile","LOCAL_TEST_CONFIG": "test_config","LOCAL_RRO_THEME": "theme",})addStandardProperties(bpparser.ListType,map[string]string{"LOCAL_SRC_FILES": "srcs","LOCAL_SRC_FILES_EXCLUDE": "exclude_srcs","LOCAL_HEADER_LIBRARIES": "header_libs","LOCAL_SHARED_LIBRARIES": "shared_libs","LOCAL_STATIC_LIBRARIES": "static_libs","LOCAL_WHOLE_STATIC_LIBRARIES": "whole_static_libs","LOCAL_SYSTEM_SHARED_LIBRARIES": "system_shared_libs","LOCAL_ASFLAGS": "asflags","LOCAL_CLANG_ASFLAGS": "clang_asflags","LOCAL_COMPATIBILITY_SUPPORT_FILES": "data","LOCAL_CONLYFLAGS": "conlyflags","LOCAL_CPPFLAGS": "cppflags","LOCAL_REQUIRED_MODULES": "required","LOCAL_HOST_REQUIRED_MODULES": "host_required","LOCAL_TARGET_REQUIRED_MODULES": "target_required","LOCAL_OVERRIDES_MODULES": "overrides","LOCAL_LDLIBS": "host_ldlibs","LOCAL_CLANG_CFLAGS": "clang_cflags","LOCAL_YACCFLAGS": "yacc.flags","LOCAL_SANITIZE_RECOVER": "sanitize.recover","LOCAL_LOGTAGS_FILES": "logtags","LOCAL_EXPORT_HEADER_LIBRARY_HEADERS": "export_header_lib_headers","LOCAL_EXPORT_SHARED_LIBRARY_HEADERS": "export_shared_lib_headers","LOCAL_EXPORT_STATIC_LIBRARY_HEADERS": "export_static_lib_headers","LOCAL_INIT_RC": "init_rc","LOCAL_VINTF_FRAGMENTS": "vintf_fragments","LOCAL_TIDY_FLAGS": "tidy_flags",// TODO: This is comma-separated, not space-separated"LOCAL_TIDY_CHECKS": "tidy_checks","LOCAL_RENDERSCRIPT_INCLUDES": "renderscript.include_dirs","LOCAL_RENDERSCRIPT_FLAGS": "renderscript.flags","LOCAL_JAVA_RESOURCE_DIRS": "java_resource_dirs","LOCAL_JAVA_RESOURCE_FILES": "java_resources","LOCAL_JAVACFLAGS": "javacflags","LOCAL_ERROR_PRONE_FLAGS": "errorprone.javacflags","LOCAL_DX_FLAGS": "dxflags","LOCAL_JAVA_LIBRARIES": "libs","LOCAL_STATIC_JAVA_LIBRARIES": "static_libs","LOCAL_JNI_SHARED_LIBRARIES": "jni_libs","LOCAL_AAPT_FLAGS": "aaptflags","LOCAL_PACKAGE_SPLITS": "package_splits","LOCAL_COMPATIBILITY_SUITE": "test_suites","LOCAL_OVERRIDES_PACKAGES": "overrides","LOCAL_ANNOTATION_PROCESSORS": "plugins","LOCAL_PROGUARD_FLAGS": "optimize.proguard_flags","LOCAL_PROGUARD_FLAG_FILES": "optimize.proguard_flags_files",// These will be rewritten to libs/static_libs by bpfix, after their presence is used to convert// java_library_static to android_library."LOCAL_SHARED_ANDROID_LIBRARIES": "android_libs","LOCAL_STATIC_ANDROID_LIBRARIES": "android_static_libs","LOCAL_ADDITIONAL_CERTIFICATES": "additional_certificates",// Jacoco filters:"LOCAL_JACK_COVERAGE_INCLUDE_FILTER": "jacoco.include_filter","LOCAL_JACK_COVERAGE_EXCLUDE_FILTER": "jacoco.exclude_filter","LOCAL_FULL_LIBS_MANIFEST_FILES": "additional_manifests",})addStandardProperties(bpparser.BoolType,map[string]string{// Bool properties"LOCAL_IS_HOST_MODULE": "host","LOCAL_CLANG": "clang","LOCAL_FORCE_STATIC_EXECUTABLE": "static_executable","LOCAL_NATIVE_COVERAGE": "native_coverage","LOCAL_NO_CRT": "nocrt","LOCAL_ALLOW_UNDEFINED_SYMBOLS": "allow_undefined_symbols","LOCAL_RTTI_FLAG": "rtti","LOCAL_PACK_MODULE_RELOCATIONS": "pack_relocations","LOCAL_TIDY": "tidy","LOCAL_USE_CLANG_LLD": "use_clang_lld","LOCAL_PROPRIETARY_MODULE": "proprietary","LOCAL_VENDOR_MODULE": "vendor","LOCAL_ODM_MODULE": "device_specific","LOCAL_PRODUCT_MODULE": "product_specific","LOCAL_SYSTEM_EXT_MODULE": "system_ext_specific","LOCAL_EXPORT_PACKAGE_RESOURCES": "export_package_resources","LOCAL_PRIVILEGED_MODULE": "privileged","LOCAL_AAPT_INCLUDE_ALL_RESOURCES": "aapt_include_all_resources","LOCAL_DONT_MERGE_MANIFESTS": "dont_merge_manifests","LOCAL_USE_EMBEDDED_NATIVE_LIBS": "use_embedded_native_libs","LOCAL_USE_EMBEDDED_DEX": "use_embedded_dex","LOCAL_DEX_PREOPT": "dex_preopt.enabled","LOCAL_DEX_PREOPT_APP_IMAGE": "dex_preopt.app_image","LOCAL_DEX_PREOPT_GENERATE_PROFILE": "dex_preopt.profile_guided","LOCAL_PRIVATE_PLATFORM_APIS": "platform_apis","LOCAL_JETIFIER_ENABLED": "jetifier","LOCAL_IS_UNIT_TEST": "unit_test","LOCAL_ENFORCE_USES_LIBRARIES": "enforce_uses_libs",})}不断更新...记录常用但不好理解的
- LOCAL_PROPRIETARY_MODULE，proprietary：true控制生成路径到vendor/lib，false就是system/lib;
- LOCAL_CLANG，clang：true来指定默认编译器为Clang，Android 8.0后不需要指定，默认是Clang；
- -----------------------------------------------------alibli分割符-------------------------------------------------------
- LOCAL_SRC_FILES：当前模块包含的所有源代码文件
- LOCAL_MODULE：当前模块的名称，这个名称应当是唯一的，模块间的依赖关系就是通过这个名称来引用的
- LOCAL_C_INCLUDES：C 或 C++ 语言需要的头文件的路径
- LOCAL_STATIC_LIBRARIES：当前模块在静态链接时需要的库的名称
- LOCAL_SHARED_LIBRARIES：当前模块在运行时依赖的动态库的名称
- LOCAL_CFLAGS：提供给 C/C++ 编译器的额外编译参数
- LOCAL_JAVA_LIBRARIES：当前模块依赖的 Java 共享库
- LOCAL_STATIC_JAVA_LIBRARIES：当前模块依赖的 Java 静态库
- LOCAL_PACKAGE_NAME：当前 APK 应用的名称
- LOCAL_CERTIFICATE：签署当前应用的证书名称
- LOCAL_MODULE_PATH：指定输出路径
- LOCAL_PRIVILEGED_MODULE：指定生成的apk是否在system/priv-app/下，等同于设置LOCAL_MODULE_PATH := $(TARGET_OUT)/system/priv-app
- LOCAL_MODULE_TAGS：user/debug/eng/optional 指定该模块在什么版本下编译 optional 表示所有版本都编译
- -----------------------------------------------------alibli分割符-------------------------------------------------------
- BUILD_HOST_STATIC_LIBRARY：编译静态库（适用于主机）
- BUILD_HOST_SHARED_LIBRARY：编译动态库（适用于主机）
- BUILD_HOST_EXECUTABLE：编译可执行程序(适用于主机)
- BUILD_HOST_PREBUILT：预编译(适用于主机)
- BUILD_HOST_JAVA_LIBRARY：编译java包(适用于主机)
- BUILD_JAVA_LIBRARY：编译java包
- BUILD_STATIC_JAVA_LIBRARY：编译java静态包
- BUILD_STATIC_LIBRARY：编译静态库
- BUILD_SHARED_LIBRARY：编译动态库
- BUILD_EXECUTABLE：编译可执行程序
- BUILD_PACKAGE：编译apk
- BUILD_PREBUILT：预编译(针对单个预编译文件)
- BUILD_MULTI_PREBUILT：预编译(针对多个预编译文件)
- -----------------------------------------------------alibli分割符-------------------------------------------------------
Android.mk文件速查速解_alibli的博客-CSDN博客
LOCAL_SHARED_LIBRARIES、LOCAL_LDLIBS、LOCAL_LDFLAGS的区别：
LOCAL_SHARED_LIBRARIES 会生成依赖关系，当库不存在时会去编译这个库。
LOCAL_LDLIBS ：链接的库不产生依赖关系，一般用于不需要重新编译的库，如库不存在，则会报错找不到。且貌似只能链接那些存在于系统目录下本模块需要连接的库。如果某一个库既有动态库又有静态库，那么在默认情况下是链接的动态库而非静态库。
如：LOCAL_LDLIBS += -lm –lz –lc -lcutils –lutils –llog …
如果你的Android.mk文件中只有这么一行，那么将会采用动态链接。
LOCAL_LDFLAGS：这个编译变量传递给链接器一个一些额外的参数，比如想传递额外的库和库路径给ld，或者传递给ld linker的一些链接参数，-On，-EL{B}(大小端字节序)，那么就要加到这个上面，如：
LOCAL_LDFLAGS += -L$(LOCAL_PATH)/lib/ -lHWrecog –EB{EL} –O{n} …
或者直接加上绝对路径库的全名：
LOCAL_LDFLAGS += $(LOCAL_PATH)/lib/libHWrecog.a –EB{EL} –O{n}
如果是非系统的第三方库，貌似只能用LOCAL_LDFLAGS方式，LOCAL_LDLIBS方式不行。
部分参考优秀博客：
Android.mk常用宏定义 - 简书 (jianshu.com)
来源地址：https://blog.csdn.net/weixin_36389889/article/details/128469488
