[cfe-dev] Diagnostic won't emit

[Andrzej Warzynski via cfe-dev]

Hi Billy,

It's a bit tricky to help without seeing the code :) Are you using any 
specific/custom diagnostic consumer? Is your properly DiagnosticBuilder 
destroyed? AFAIK, that's when the message is printed.

Here's a bit more up-to-date example:
* 
https://github.com/banach-space/clang-tutor/blob/master/lib/CodeStyleChecker.cpp#L97-L102
And a test that verifies that the diagnostic is indeed printed:
* 
https://github.com/banach-space/clang-tutor/blob/master/test/CodeStyleCheckerMacro.cpp

Happy to help if that example doesn't work for you! Hopefully it will 
help debugging your own code :)

-Andrzej

On 09/10/2020 16:26, Billy O'Mahony via cfe-dev wrote:
> Hi,
> 
> hopefully a straightforward issue.
> 
> I have written a standalone cfe tool to catch some project-specific bugs 
> in a code base.
> 
> I am now replacing my cout << "ERROR..." messages with 
> clang::Diagnostics by following this example:
> 
> https://github.com/peter-can-talk/cppnow-2017/blob/master/code/mccabe/mccabe.cpp#L46-L54
> 
> However I don't see anything being printed when I run it (except my own 
> cout << "error.." messages)..
> 
> I've seen the mcabbe example generate diagnostics on a 
> youtube presentation and both it and my app use 
> clang::Tool.  mccabbe uses ast_matcher::MatchFinder whereas I use 
> several classes derived from RecursiveASTVisitor. Presumably MatchFinder 
> sets up a DiagnosticsConsumer that finally emits the diagnostics??
> 
> But I couldn't really find out how to set up a DiagnosticsConsumer - if 
> that is indeed what I need to do.
> 
> Thanks,
> Billy.
> 
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