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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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 wonder if it is worth asking upstream if they
have any advice.

Ian.



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