[PATCH] D84076: [llvm-exegesis] Unset HAVE_LIBPFM if the kernel is too old.

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In D84076#2159963 <https://reviews.llvm.org/D84076#2159963>, @mgorny wrote:

> You shouldn't be checking the running kernel but the version of the kernel headers. Think of build hosts building LLVM for an entirely different system altogether.


To add to that, you shouldn't hardcode version, but instead check that the problematic field is present or not.
And, i'm not sure this is a good idea. If the kernel is too old, i'd suggest only disabling the functionality
that wants that new field, not the entire libpfm


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  https://reviews.llvm.org/D84076/new/

https://reviews.llvm.org/D84076