When built with: Android clang version 3.8.275480  (based on LLVM 3.8.275480)

The following warning is emitted:

ccache /pathto/android/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/clang -target x86_64-none-linux-androideabi -gcc-toolchain /pathto/android/android-ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64 -c -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes --sysroot=/pathto/android/android-ndk/sysroot -D__ANDROID_API__=21 -isystem /pathto/android/android-ndk/sysroot/usr/include/x86_64-linux-android -Wno-unused-value -Wno-empty-body -Qunused-arguments -Wno-nullability-completeness -Wno-parentheses-equality   -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration  -IObjects -IInclude -IPython -I. -I/pathto/src/python/master/Include -I/pathto/tmp/android-makesetup/build/python3.7-extlibs-android-21-x86_64//data/local/tmp/python/include --sysroot=/pathto/android/android-ndk/sysroot -D__ANDROID_API__=21 -isystem /pathto/android/android-ndk/sysroot/usr/include/x86_64-linux-android   -DPy_BUILD_CORE -o Python/pyhash.o /pathto/src/python/master/Python/pyhash.c
/pathto/src/python/master/Python/pyhash.c:275:11: warning: comparison of integers of different signs: 'Py_uhash_t' (aka 'unsigned long') and 'int' [-Wsign-compare]
    if (x == -1) {
        ~ ^  ~~
1 warning generated.