Failed to build on macOS m1 for android

[thewh1teagle]

I'm trying to build the crate aec-rs which uses cmake-rs (build.rs) with CMake.

export NDK_HOME="$HOME/Library/Android/sdk/ndk/$(ls -1 $HOME/Library/Android/sdk/ndk | sort | tail -n 1)"
export CMAKE_TOOLCHAIN_FILE="$NDK_HOME/build/cmake/android.toolchain.cmake"
export ANDROID_ABI="arm64-v8a"
cargo ndk -t arm64-v8a -o ./jniLibs build --release

But it failed with:

 -- The CXX compiler identification is Clang 18.0.1
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - failed
  -- Check for working C compiler: /Users/user/Library/Android/sdk/ndk/27.0.12077973/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang
  -- Check for working C compiler: /Users/user/Library/Android/sdk/ndk/27.0.12077973/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang - broken
  -- Configuring incomplete, errors occurred!

  --- stderr
  CMake Error at /Applications/CMake.app/Contents/share/cmake-3.30/Modules/CMakeTestCCompiler.cmake:67 (message):
    The C compiler

      "/Users/user/Library/Android/sdk/ndk/27.0.12077973/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang"

    is not able to compile a simple test program.

    It fails with the following output:

      Change Dir: '/Volumes/Internal/audio/aec-rs/target/aarch64-linux-android/release/build/aec-rs-sys-5aa0159efa82a17d/out/build/CMakeFiles/CMakeScratch/TryCompile-zIjAIO'

I can build clean rust project in the same way.
also, If I add the following in build.rs it compile successfully:

config.define(
    "CMAKE_TOOLCHAIN_FILE",
    "/Users/user/Library/Android/sdk/ndk/27.0.12077973/build/cmake/android.toolchain.cmake",
);
config.define("ANDROID_ABI", "arm64-v8a");
config.define("ANDROID_PLATFORM", "android-35");
config.define("CMAKE_C_COMPILER", "/Users/user/Library/Android/sdk/ndk/27.0.12077973/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android35-clang");
config.define("CMAKE_CXX_COMPILER", "/Users/user/Library/Android/sdk/ndk/27.0.12077973/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android35-clang++");

Or the following:

config.define(
        "CMAKE_TOOLCHAIN_FILE",
        "/Users/user/Library/Android/sdk/ndk/27.0.12077973/build/cmake/android.toolchain.cmake",
    );
    config.define("ANDROID_ABI", "arm64-v8a");
    config.define("ANDROID_PLATFORM", "android-35");

However I believe it should pick them automatically from cargo-ndk?

By the way, it also failed with wasm

Update:

// Must set when compile for Android
    // Variables comes from cargo-ndk
    if let Ok(abi) = env::var("CARGO_NDK_ANDROID_TARGET") {
        config.define("ANDROID_ABI", abi);
    }
    if let Ok(platform) = env::var("ANDROID_PLATFORM") {
        config.define("ANDROID_PLATFORM", platform);
    }

Along with

export NDK_HOME="$HOME/Library/Android/sdk/ndk/$(ls -1 $HOME/Library/Android/sdk/ndk | sort | tail -n 1)"
export CMAKE_TOOLCHAIN_FILE="$NDK_HOME/build/cmake/android.toolchain.cmake"
cargo ndk -t arm64-v8a -o ./jniLibs build --release -p libaec

This fix the issue. should I create PR?