[cfe-dev] [VerifyDiagnosticConsumer] support -verify=<prefixes>

[Joel Denny via cfe-dev]

Hi,

I recently wrote a patch to extend clang's -verify option to support
prefixes similar to FileCheck's --check-prefixes:

https://reviews.llvm.org/D39694

The goal is to permit exercising a single test suite source file with
different compiler options producing different sets of diagnostics. While
preprocessor directives can be combined with the existing -verify to
accomplish the same goal, source is often easier to maintain when it's not
cluttered with preprocessor directives or duplicate passages of code. For
example, this patch also rewrites some existing clang tests to demonstrate
the benefit of this feature.

This patch has been sitting for a few weeks without response.  I tried to
select appropriate reviewers based on commit logs, but maybe posting here
will help to find reviewers.

Thanks.

Joel E. Denny
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