Docs: ANDROID_ARM_NEON

[Zingam]

The change log states that "ndk-build and CMake now default to using NEON for ARM when targeting android-23 (Marshmallow) or newer."
https://github.com/android-ndk/ndk/wiki/Changelog-r18
The docs here state
ANDROID_ARM_NEON FALSE (default)
Shouldn't that discrepancy be clarified?

[enh]

you might have to hit reload, but this should be fixed now.

(at some point we need to find the time to go through all of these and check that they're still accurate, but in the meantime please file bugs for any more mistakes you find.)

[Zingam]

@enh How does one make sure that NEON builds are enabled? None of these seem to be set in my CMakeLists.txt

${CMAKE_ANDROID_ARM_NEON}
${ANDROID_ARM_NEON}

[DanAlbert]

Look at the build log. Look for -mfpu=neon

[Zingam]

My mistake. I use an external CMake #463 and if I get it right it won't matter in the future because it will be enabled in the driver #812
Thanx!

[DanAlbert]

Correct. If you're not using our toolchain file none of this will be handled for you. Enabling NEON by default for Clang regardless of build system won't happen until r20.