[cfe-dev] Fix for preprocessor CommentHandler bug

[Andy Gibbs]

On Tuesday, June 12, 2012 6:31 PM, David Blaikie wrote:
> <clippy>It looks like you're trying to fix a bug - would you like to
> include a test case?</clippy>
>
> & is this a fix for: http://llvm.org/bugs/show_bug.cgi?id=13065 by
> chance? I'm curious what caused the bug as I'd assumed it was due to
> my commit ( https://llvm.org/svn/llvm-project/cfe/trunk@158093 ). But
> judging by the fix, that might not be the case.

No, the bug was uncovered while making an enhancement patch for the 
"-verify" feature, where I changed from the use of the separate parse step 
to using the CommentHandler interface.  Unfortunately, the CommentHandler 
interface was not invoked in some cases where comments followed #else or 
#endif directives, and this meant I needed to alter some pre-existing 
test-cases to enable them to work with my patch.  This fix was directed at 
removing this necessity.

In reply, then, to the missing test-cases, I have test-cases as part of my 
patch for the new "-verify" feature, since this actually uses the 
CommentHandler interface and can directly test it.  I accept that this is a 
weak reply, but my hope is that with the approval of this and my other 
recent preprocessor patch, then my "-verify" patch can also meet with 
approval -- in which case the test-cases will appear as part of that.

Alternatively, is there a better way to test the CommentHandler interface? 
If so, I can supply some specific test-cases for this patch.

Thanks
Andy