mgrabovsky added a comment.

In http://reviews.llvm.org/D13643#266926, @aaron.ballman wrote:

> I would spend some time digging into how GCC handles those cases, and use 
> that as a baseline that we can then improve upon. I like the fact that GCC 
> basically says "use parens to clarify your intent", as that solves all of the 
> cases regarding equality and inequality.
>
> I would imagine type == type == bool should behave the same as bool == bool 
> == bool; it can be valid code that just needs parens to clarify intent. As 
> for C90 behavior, I'm not too worried about what we do there.


I'm back. The warning is emitted in `gcc/c-family/c-common.c` L11488–11503; GCC 
only does this for what LLVM calls 'relational' operators (i.e., comparisons 
except == and !=) and for integral types.


http://reviews.llvm.org/D13643



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