[PATCH] D83682: [FileCheck] Add docs for --allow-empty

[Thomas Preud'homme via Phabricator via llvm-commits]

thopre added a comment.

In D83682#2149473 <https://reviews.llvm.org/D83682#2149473>, @MaskRay wrote:

> https://lists.llvm.org/pipermail/llvm-dev/2020-July/143344.html discusses --allow-empty, but I still don't get why we need --allow-empty.


If testing for the absence of an error message, FileCheck could give a successful return value even though a testcase failed to compile. Having FileCheck defaults to erroring on empty input allows to catch such a case. However there are genuine cases where one might be fine with an empty input which is why --allow-empty is needed.


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