Re: [Xen-devel] [PATCH] gcov: Support gcc 4.7

["Egger, Christoph" <chegger@xxxxxxxxx>]

On 17.06.13 12:42, Ian Campbell wrote:
> On Mon, 2013-06-17 at 09:29 +0100, Frediano Ziglio wrote:
>> gcc 4.7 changed format used internally for coverage data.
>> This patch address these changes.
>> The information that gcc generate are mostly the same but to support common
>> sections.
>> The only difference in the blob exported by Xen is that functions have 2
>> different checksums instead of one.
> 
> Do we really need to reflect that in the Xen public API though? Could we
> condense it into the things we want/need and try and keep our API
> relatively stable? 
> 
> I'm a bit concerned that we are going to end up with dozens of variants
> of the API (and the internal code) supporting each new variant of this
> internal-to-gcc ABI.
> 
> I think you explained before why this couldn't be exported from the
> hypervisor as an opaque set of bytes to be interpreted by a userspace
> tool, which is a shame.

I think this is possible the same way the hypervisor exports
machine check error telemetry.

Christoph


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