“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 库添加一个 strip debug symbols 步骤，其中包括用于不同 ABI 的本机共享库，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.

我了解 strip 命令必须分别对应于每个 ABI.因此，我需要调用正确的 strip 命令，为此我需要在构建期间知道它的正确路径.

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，有没有办法利用其他已知的 Android CMake 变量来形成这条路径，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 指出通常存在的文件 android.toolchain.cmake在 macOS 上的目录 ~/Library/Android/sdk/cmake/cmake_version_xxx/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

ANDROID_TOOLCHAIN_PREFIX 正是我要找的，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.")

而且我不需要明确从命令行向构建过程传递任何其他参数，即 DCMAKE_TOOLCHAIN_FILE=android.toolchain.cmake.因为，这个文件，即android.toolchain.cmake，已经被Android原生构建系统自动考虑进去了.

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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