The documentation was not updated from the very beginning, but in fact the toolchain file from this project supports all NDK releases from r5 to r8b and works with r8c when it clearly indicates its location.
If you need full support for the NDK r8c functions, including the Clang compiler, then you can get the latest version of CMake toolkit from my fork on GitHub: https://github.com/taka-no-me/android-cmake
Andrey Kamaev
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