[cfe-dev] [llvm-dev] [SemaCXX] Should we fix test failing due to reverse iteration?

[Grang, Mandeep Singh via cfe-dev]

Thanks for the fix, Richard.

On 6/1/2017 9:41 PM, Richard Trieu wrote:
> This is my old code.  I went ahead and fixed it in r304519.  Let me 
> know if there's any other trouble from it.
>
> (To the mailing lists this time.)
>
> On Thu, Jun 1, 2017 at 1:46 PM, Grang, Mandeep Singh via llvm-dev 
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>
>     I see that the following test fails if reverse iteration of
>     SmallPtrSet is enabled:
>
>     /clang/test/SemaCXX/warn-loop-analysis.cpp/
>
>     This is because in SemaStmt.cpp we iterate SmallPtrSet and output
>     warnings about the variables not used in the loop.
>
>     Expected output: /warning: variables 'i', 'j', and 'k' used in
>     loop condition not modified/
>
>     Output with reverse iteration: /warning: variables 'k', 'j', and
>     'i' used in loop condition not/
>
>     I would like the community's opinion on whether this is something
>     worth fixing? In this case, should the output always be the same
>     irrespective of the iteration order?
>
>     If yes, then we have 2 alternatives:
>
>     1. Change SmallPtrSet to SmallVector for the container (VarDecls)
>     being iterated - this may have a compile time impact (need to
>     measure).
>
>     2. Sort the container (VarDecls) before iteration. We can sort
>     based on decl source location and decl name. Not sure if these
>     guaranteed to be unique?
>
>     Thanks,
>
>     Mandeep
>
>
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>

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