[gcn][patch] Add -mgpu option and plumb in assembler/linker

[Andrew Stubbs]

On 06/06/17 20:52, Andrew Stubbs wrote:
> Thomas objects to the new option, and after talking with him the 
> reasoning seems sound. GCC has been moving away from -mcpu in any case, 
> so I guess I'll put -march and -mtune back, and use those for the same 
> purpose.
> 
> I'll commit the patch with those changes soonish.

I've finally got around to pushing the patch.

It now uses -march to set the GPU name.

Andrew

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