[PATCH] D47114: [FileCheck] Implement -v and -vv for tracing matches

[George Karpenkov via Phabricator via llvm-commits]

george.karpenkov added a comment.

@jdenny I'm not against exposing `LIT_FLAGS`.
What I was saying is that in my understanding, most of those scenarios with custom flags would be covered by "a developer is debugging a test and needs more information".
So I think that instead of exposing many variables and custom flags it would be great if we could have, e.g.

- Default: same as now
- LIT_DEBUG=1: FileCheck is passed `-v`, LIT is passed `-vv`
- LIT_DEBUG=2: FileCheck is passed `FILECHECK_VERBOSE` (dumps all input on failure), plus same as above


Repository:
  rL LLVM

https://reviews.llvm.org/D47114