Failure in cross-compiling for Android on OS X

[rzambre]

Host: OS X 10.11.5
Target: Nexus 6P (Android 6.0 has an API-level of 23)

I used the toolchain generated by this command:

/path/to/my/android-ndk-r12/build/tools/make-standalone-toolchain.sh --platform="android-23" --toolchain=arm-linux-androideabi-4.9 --install-dir=./toolchain --ndk-dir=/path/to/my/ndk --arch=arm

The above command is slightly different from the one on Building for Android wiki page w.r.t. the eabi version (the new NDK comes with 4.9) and the platform number.

I set the environment variables through the .servobuild file. Here are the values I set:
sdk = "/path/to/my/sdk"
ndk = "/path/to/my/android-ndk-r12"
toolchain = "/path/to/my/toolchain"
platform = "android-23"

I also tried the same with the platform set to "android-18" but I still get the same error. In all my trials, the build always fails at heartbeats-simple-sys v0.3.0 and the error is Specified Android native API level 'android-8' is not supported by your NDK/toolchain.

Compiling openssl-sys v0.7.13
Build failed, waiting for other jobs to finish...
error: failed to run custom build command for heartbeats-simple-sys v0.3.0
Process didn't exit successfully: /Users/rzambre/Documents/servo/servo-android/target/release/build/heartbeats-simple-sys-352cd6b5cb86c823/build-script-build (exit code: 101)
--- stdout
running: "cmake" "/Users/rzambre/Documents/servo/servo-android/./.cargo/registry/src/github.com-1ecc6299db9ec823/heartbeats-simple-sys-0.3.0/heartbeats-simple" "-DCMAKE_TOOLCHAIN_FILE=/Users/rzambre/Documents/servo/servo-android/./.cargo/registry/src/github.com-1ecc6299db9ec823/heartbeats-simple-sys-0.3.0/heartbeats-simple/cmake-toolchain/android.toolchain.cmake" "-DCMAKE_INSTALL_PREFIX=/Users/rzambre/Documents/servo/servo-android/target/arm-linux-androideabi/release/build/heartbeats-simple-sys-352cd6b5cb86c823/out" "-DCMAKE_C_FLAGS= -O0 -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_CXX_FLAGS= -O0 -ffunction-sections -fdata-sections -fPIC" "-DCMAKE_BUILD_TYPE=Release"
-- Configuring incomplete, errors occurred!
See also "/Users/rzambre/Documents/servo/servo-android/target/arm-linux-androideabi/release/build/heartbeats-simple-sys-352cd6b5cb86c823/out/build/CMakeFiles/CMakeOutput.log".

--- stderr
CMake Error at cmake-toolchain/android.toolchain.cmake:800 (message):
Specified Android native API level 'android-8' is not supported by your
NDK/toolchain.
Call Stack (most recent call first):
/usr/local/Cellar/cmake/3.5.2/share/cmake/Modules/CMakeDetermineSystem.cmake:98 (include)
CMakeLists.txt:3 (project)

thread 'main' panicked at '
command did not execute successfully, got: exit code: 1

build script failed, must exit now', /Users/rzambre/Documents/servo/servo-android/./.cargo/registry/src/github.com-1ecc6299db9ec823/cmake-0.1.17/src/lib.rs:463
note: Run with RUST_BACKTRACE=1 for a backtrace.

[Warning] Could not generate notification! Optional Python module 'pyobjc' is not installed.
Build completed in 0:08:54

I'm not seeing any ERROR messages in the previous scripts that compile C files.
What could be causing this issue?

@larsbergstrom @glennw

[aneeshusa]

I suspect this may be related to #11876.

[mmatyas]

Meanwhile, a temporary fix is to run the build like this:
ANDROID_NATIVE_API_LEVEL=android-18 ANDROID_PLATFORM=android-18 ./mach build --rel --android
You might need to ./mach clean first though.

[rzambre]

The fix by mmatyas works well. Closing the issue.