bump Android NDK to r14b

[dulmandakh]

Bump Android NDK to r14b.

NDK tool chain is set to GCC 4.9 (in Application.mk file), because clang fails to build RN.

Below are notable changes to r14b

GCC is no longer supported. It will not be removed from the NDK just yet, but is no longer receiving backports.

and

NDK_TOOLCHAIN_VERSION now defaults to Clang.

CI: https://circleci.com/gh/dulmandakh/react-native/573

Test Plan:

Builds and runs as before

Release Notes:

[ANDROID] [ENHANCEMENT] [NDK] - bump version to r14b

[dulmandakh]

RN community, let's make it compile with clang 😄

[gengjiawen]

This pr #19536 bump ndk to 16, r13b maybe too old.

[dulmandakh]

IMHO, NDK 13 requires almost no change in source code and still builds the source code. I see it as a small, but non-disruptive step in supporting newer NDK versions and 64bit CPUs.

[dulmandakh]

Bumped NDK to r14b, which became possible with 8ce758f.

CI is OK https://circleci.com/gh/dulmandakh/react-native/605

I couldn't build with versions above 14, and I'm not proficient enough in C++ to fix build errors.

CC: @hramos

[gengjiawen]

I still prefer to the latest ndk, since it's for all cpu arch, not just arm64. And it can easily installed via android studio.

[dulmandakh]

@gengjiawen me too, if you read through revision history NDK is not adding support for CPU architectures but removing them.

NDK is switched from GCC to Clang, GNU C++ standard library to Clang's libc++ and unified headers therefore it might require some code changes. For example, folly github page states that it requires GCC to build. If merged, we'll land clang, libc++ and unified headers to play with.

I think it's better to have small incremental changes rather than nothing or disruptive big change.

[dulmandakh]

Please review @hramos @mdvacca

[gengjiawen]

@ulmandakh I think the removed abi won't has effect for this project, since they removed the abi is no one used or deprecated as you can see https://github.com/android-ndk/ndk/wiki/Changelog-r17. I agree with we should small incremental changes, but I think the latest ndk is okay.

[dulmandakh]

Please review and merge @fkgozali @hramos @mdvacca . Once merged I would like help with landing Unified Headers introduced in NDK r14 and default in r15.

• https://android.googlesource.com/platform/ndk.git/+/ndk-r14-release/docs/UnifiedHeaders.md
• https://android.googlesource.com/platform/ndk/+/ndk-r15-release/docs/UnifiedHeadersMigration.md

[facebook-github-bot]

@dulmandakh I tried to find reviewers for this pull request and wanted to ping them to take another look. However, based on the blame information for the files in this pull request I couldn't find any reviewers. This sometimes happens when the files in the pull request are new or don't exist on master anymore. Is this pull request still relevant? If yes could you please rebase? In case you know who has context on this code feel free to mention them in a comment (one person is fine). Thanks for reading and hope you will continue contributing to the project.