[Patch] Driver: Warn on -mcmode=kernel on Darwin

[Vedant Kumar]

I’ve attached an updated patch which passes check-clang.

The old patch neglected to specify a warning group. Please ignore it.

vedant

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On Jul 24, 2015, at 3:58 PM, Vedant Kumar <vsk at apple.com> wrote:

> The 'kernel' mcmodel is not fully supported on Darwin (PR 19131741).
> 
> This patch causes the driver to spit out a warning when users pass -mcmodel=kernel in.
> 
> I was asked to add this warning because the alternatives are (1) crashing mysteriously in SelectionDAG, or (2) erroring out in the driver.
> 
> Since I don't have commit rights yet, I'd appreciate someone looking over this patch and guiding it into trunk.
> 
> thanks!
> vedant
> 
> <mcmodel-kernel-darwin.patch>