Report issues to GitHub.
For Android Studio issues, follow the docs on the Android Studio site.
The deprecated headers have been removed. Unified Headers are now simply The Headers.
For migration tips, see Unified Headers Migration Notes.
GCC is no longer supported. It will not be removed from the NDK just yet, but is no longer receiving backports. It cannot be removed until after libc++ has become stable enough to be the default, as some parts of gnustl are still incompatible with Clang. It will likely be removed after that point.
-latomic
to your ldflags should no longer be necessary.-fintegrated-as
for MIPS64 for custom build systems. See https://github.com/android-ndk/ndk/issues/399.