Similarities to other CPU feature projects (deduplicate?)

ART on Android works around quirks/bugs in /proc/cpuinfo and aux vector, has support for cross compilation, detection of features via C preprocessor, CPUID instructions, undefined instruction exceptions, supports MIPS, ARM, Intel 32 and 64, etc.:
https://android.googlesource.com/platform/art/+/master/runtime/arch/instruction_set_features.h#36
Android NDK has something simple:
https://developer.android.com/ndk/guides/cpu-features.html
V8 CPU feature detection:
https://github.com/v8/v8/blob/master/src/base/cpu.h#L32

As there are OS/CPU bugs that cause issues standardizing on 1 library makes sense. As an author of the ART code I'm have a bias :-)