"strip"的Android NDK路径变量CMake构建工具链中的命令 [英] Android NDK path variable for "strip" command in CMake build tool chain

问题描述

我正在尝试为我的Android库添加 Strip调试符号步骤，该步骤包括适用于不同ABI的本地共享库，例如x86/native-lib.so，x86_64/native-lib.so，arm64-v8a/native-lib.so等

I am trying to add a strip debug symbols step for my Android library which includes native shared libraries for different ABIs, e.g. x86/native-lib.so, x86_64/native-lib.so, arm64-v8a/native-lib.so, etc.

我知道，剥离命令必须与每个ABI相对应.因此，我需要调用正确的 strip命令，为此我需要知道其在构建期间的正确路径.

I understand that the strip command must be respective to each ABI. So, I need to invoke the correct strip command, for which I need to know its correct path during build time.

例如，对于ABI x86_64 ，我需要具有以下路径设置:

For example, for ABI x86_64, I need to have below path setting:

set(STRIP ~/Library/Android/android-ndk-r16b/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/x86_64-linux-android-strip)

add_custom_command(TARGET ${SHARED_LIBRARY_NAME} POST_BUILD
                COMMAND ${STRIP}
                "${DIST_LIBS_DIR}/${LIB_BUILD_TYPE}/${ANDROID_ABI}/lib${SHARED_LIBRARY_NAME}.so"
                COMMENT "Strip debug symbols done on final binary.")

我需要的路径如下图所示:

The path I need is illustrated like below:

所以，我的问题是:

• 是否存在指向此路径的现有CMake变量，即/android-ndk-r16b/toolchains/???/prebuilt/???/bin/???-???-???-strip?

如果没有，是否有办法利用其他已知的Android CMake变量来形成此路径，例如ANDROID_NDK，ANDROID_ABI等?

If not, is there a way to form this path utilising other known Android CMake variable, e.g. ANDROID_NDK, ANDROID_ABI, etc?

推荐答案

非常感谢 @Alex Cohn 指出通常在macOS上目录~/Library/Android/sdk/cmake/cmake_version_xxx/android.toolchain.cmake中存在的文件android.toolchain.cmake.

Thanks @Alex Cohn a lot for pointing out the file android.toolchain.cmake which usually exists at directory ~/Library/Android/sdk/cmake/cmake_version_xxx/android.toolchain.cmake on macOS.

内部已经配置了许多有用的Android CMake变量，例如

There are many useful Android CMake variables already configured inside, e.g.

ANDROID_NDK
ANDROID_TOOLCHAIN
ANDROID_ABI
ANDROID_PLATFORM
ANDROID_STL
ANDROID_PIE
ANDROID_CPP_FEATURES
ANDROID_ALLOW_UNDEFINED_SYMBOLS
ANDROID_ARM_MODE
ANDROID_ARM_NEON
ANDROID_DISABLE_NO_EXECUTE
ANDROID_DISABLE_RELRO
ANDROID_DISABLE_FORMAT_STRING_CHECKS
ANDROID_CCACHE

一个 ANDROID_TOOLCHAIN_PREFIX 正是我想要的，所以我的最终CMake脚本如下:

And the one ANDROID_TOOLCHAIN_PREFIX is exactly what I looked for, so my final CMake script comes into below:

add_custom_command(TARGET ${SHARED_LIBRARY_NAME} POST_BUILD
            COMMAND "${ANDROID_TOOLCHAIN_PREFIX}strip" -g -S -d --strip-debug --verbose
            "${DIST_LIBS_DIR}/${LIB_BUILD_TYPE}/${ANDROID_ABI}/lib${SHARED_LIBRARY_NAME}.so"
            COMMENT "Strip debug symbols done on final binary.")

而且，我无需明确将任何其他参数(即DCMAKE_TOOLCHAIN_FILE=android.toolchain.cmake)从命令行传递到构建过程.因为此文件(即android.toolchain.cmake)已被Android本机构建系统自动考虑在内.

And I don't need to explicitly pass any additional arguments, i.e. DCMAKE_TOOLCHAIN_FILE=android.toolchain.cmake, from command line to the build process. Because, this file, i.e. android.toolchain.cmake, was already taken into account automatically by Android native build system.

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