GNU attribute output on errors

[Alan Modra]

On Thu, Jul 05, 2018 at 10:43:43AM -0400, Carlos O'Donell wrote:
> I don't suggest warning by default on the missing tag, but let me reiterate
> again my position:
> 
> (1) gcc should always emit the tag.
> 
> (2) we should have the capability to warn if the tag is missing.

That's not too unreasonable.  ;-)  I'll worry about (2) after (1)
happens.  Right now there are more pressing linker issues.  I
discovered today that PowerPC gold currently ignores
.gnu.attributes.  First pass at the support attached.

-- 
Alan Modra
Australia Development Lab, IBM
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