Android.bp探究
有时不知道Android.bp要咋写，特意看了下源码：
./build/soong/androidmk/androidmk/android.go
简单的Android.bp的模板是下面这个样子：
[module type] {
name: "[name value]",
[property1 name]："[property1 value]",
[property2 name]："[property2 value]",
}关键是这些内容我们要咋填写，来讲一讲吧。
module type对应android.go文件中的moduleTypes和prebuiltTypes.
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",
}像android_app_import(预编译无源码apk)，prebuilt_etc（预编译配置文件），android_app（编译含源码的apk）,java_library（编译java静态库），cc_binary（编译可执行文件），这些属性都是我们经常用到的。
name属性不用多说，编译目标的名字。来看下property属性。
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_CERTIFICATE_LINEAGE": "lineage",
"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_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_USES_LIBRARIES": "uses_libs",
"LOCAL_OPTIONAL_USES_LIBRARIES": "optional_uses_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",
// will be rewrite later to "license_kinds:" by byfix
"LOCAL_LICENSE_KINDS": "android_license_kinds",
// will be removed later by byfix
// TODO: does this property matter in the license module?
"LOCAL_LICENSE_CONDITIONS": "android_license_conditions",
"LOCAL_GENERATED_SOURCES": "generated_sources",
})
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_PRODUCT_SERVICES_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",
"LOCAL_CHECK_ELF_FILES": "check_elf_files",
})addStandardProperties函数的第一个参数决定了这些属性的类型(String,List,Boolean),配置属性时可以对照看下自己写的值对不对。像privileged(是否编译到priv-app目录)，
product_specific(是否编译到product目录),system_ext_specific(是否编译到system_ext目录),dex_preopt.enabled(dex优化),certificate(使用何种签名)。
对于string属性具体可以设置啥值，还有待研究。