[PATCH] D104556: [InstrProfiling] Make CountersPtr in __profd_ relative

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers added a comment.

In D104556#2831757 <https://reviews.llvm.org/D104556#2831757>, @vsk wrote:

> llvm has had a long-standing policy of keeping details of the .profraw format private between libprofile and InstrProfReader, opting to only commit to backwards-compat for the indexed .profdata format. I'm concerned that breaking with that practice would send the wrong message and commit llvm to maintaining an extra compat layer for a long time.
>
> Why/how does the Linux PGO patch "care" about the .profraw format?

Because the Linux kernel cannot statically link against compiler-rt; we MUST emulate the interfaces provided by compiler-rt within the Linux kernel's runtime.


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