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tubestation/servo/support/android/toolchain.cmake
John Lin 3e398e1786 servo: Merge #18031 - Fix Android build errors on macOS (from jhlin:android-build-on-macos); r=mbrubeck
- Add sysroot path to environment variable 'CPPFLAGS':
  When checking C preprocessor, the 'configure' script of libbacktrace uses 'CPPFLAGS' rather than 'CFLAGS' and doesn't get the correct search path. (#15758)
  This check passes on Linux because the '/lib/cpp' fallback is available there.

- Introduce CMake toolchain file for Android cross compiling:
  CMake needs several variables [1] to cross compile for Android.
  It works (accidentally) on Linux because cmake-rs sets compilers correctly and binutils for Linux & Android are pretty much the same.

[1] https://cmake.org/cmake/help/v3.7/manual/cmake-toolchains.7.html#cross-compiling-for-android-with-the-ndk

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #15758 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because it's a fix to build errors.

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Source-Repo: https://github.com/servo/servo
Source-Revision: a3b85cbd6cd74090b6e9f09e3d0980045e8f6a1b
2017-09-15 14:05:00 -05:00

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CMake

set(CMAKE_SYSTEM_NAME Android)
set(CMAKE_ANDROID_NDK $ENV{ANDROID_NDK})
set(CMAKE_ANDROID_API $ENV{NDK_ANDROID_VERSION})
set(CMAKE_ANDROID_ARCH_ABI $ENV{CMAKE_ANDROID_ARCH_ABI})