[PATCH] Bug 15109: Implement -Wdouble-promotion for clang

[George Burgess IV via cfe-commits]

Thanks for this patch! :) Just a few small nits:
- Is there a reason that test/SemaCXX/warn-double-promotion.cpp can't be at
test/Sema/warn-double-promotion.c instead?
- Can we make the warning message a bit more specific? Maybe something like
"implicit conversion increases floating-point precision: %0 to %1"?
- Please get rid of the empty line after `else if (TargetBT->getKind() >
SourceBT->getKind()) {`

After those are fixed, LGTM -- will you need me to commit this for you?

On Tue, Oct 27, 2015 at 9:45 PM, Carl Norum via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Hi folks,
>
> I had need of this warning, so I cobbled something together. Can someone
> please check it out and let me know if it's reasonable? I'm certainly no
> expert at this stuff. Patch attached for review, thanks!
>
> -- Carl
>
>
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