Android.mk 转换为 Android.bp
Android.mk文件是GNU Makefile的一小部分，它用来对Android程序进行编译。因为所有的编译文件都在同一个 GNU MAKE 执行环境中进行执行，而Android.mk中所有的变量都是全局的。
Soong是 Android 的构建系统，旨在替代旧的 make-based build system ，Soong读Android.bp文件，它们以类似 Bazel 的语法定义模块。Soong 本身是在 Blueprint 之上用 Go 编写的框架，反过来使用 Ninja作为后端。 Ninja 旨在提高效率，尤其是对于增量构建。
因为Android是个大项目，搬家到Soong/Android.bp需要一些时间。在过渡期间，两种格式都支持，Soong为Android.bp , 和 Kati为 Android.mk .标准构建将同时运行两者。 Android.mk 中的模块文件可以依赖于 Android.bp 中的模块文件，但不是其他方式。
Android.bp的重要区别是缺乏显式的 if 语句来提高性能。而Android.mk文件可以包含 ifeq检查任意环境变量，Android.bp格式只允许区分预定义的情况，例如处理器架构或调试/发布版本 ( reference )。自定义大小写区别必须在 Go ( reference ) 中单独定义。
因设计差异，Android.mk自动转换至 Android.bp不可行，尽管有一个名为 androidmk 的工具可以简单翻译Android.mk文件(例如没有 if 语句)到 Android.bp ，有一些androidmk 工具无法转换的语句，可以学习bp的命令。
androidmk工具使用方法
1. cd out/soong/host/linux-x86/bin/androidmk
2. androidmk [flags] <inputFile>
注：androidmk parses <inputFile> as an Android.mk file and attempts to output an analogous Android.bp file (to standard out)
android.mk与android.bp变量对应关系
build/soong/androidmk/androidmk/android.go
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",
})
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",
})
}