We enable those warnings deliberately. There is a specific ThirdParty module set up for SQLLite which does not exhibit those problems (though some related fixes to that are in 4.21).
In 4.20, it is no longer possible to add the SQLite Almagamation files to a project. Attempting to build a project with these files added results in the build failing due to numerous errors about preprocessir macros in the SQLite files not being defined.
Yes. This worked successfully in 4.19.
The build fails with multiple errors about various preprocessor macros in the SQLite files not being defined.
The build completes successfully.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-64523 in the post.