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testing/pahole: new aport

Dominique Martinet requested to merge martinetd/aports:pahole into master

pahole is required to build linux with BTF (among other things)

You can read about BTF on Brendan Gregg's blog if curious: http://www.brendangregg.com/blog/2020-11-04/bpf-co-re-btf-libbpf.html The final aim would be to compile alpine kernels with CONFIG_DEBUG_INFO_BTF=y so tools like bpftrace get easier to use, but that is for a bit later :)

On this patch itself: I'm not really happy with the musl compat patch as it's mostly not upstreamable as is, mostly the cmake part that is as ugly as it can get... Do we have a recommended way of handling that?

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