support perf trampoline on -linux-musl

[nekopsykose]

Feature or enhancement

Proposal:

currently the autotools does the following check

AS_CASE([$PLATFORM_TRIPLET],
  [x86_64-linux-gnu], [perf_trampoline=yes],
  [aarch64-linux-gnu], [perf_trampoline=yes],
  [perf_trampoline=no]
)

simply making it

AS_CASE([$PLATFORM_TRIPLET],
  [x86_64-linux-gnu], [perf_trampoline=yes],
  [x86_64-linux-musl], [perf_trampoline=yes],
  [aarch64-linux-gnu], [perf_trampoline=yes],
  [aarch64-linux-musl], [perf_trampoline=yes],
  [perf_trampoline=no]
)

makes the trampoline build on musl libc systems too, and it seems to work fine: https://img.ayaya.dev/yT9j39Lfeb8u

it doesn't seem like the assembly actually depends on libc support. maybe it should check -linux-* instead?

in any case just adding the above triples seems to work ok, unless i'm missing something, so it would be nice if it was added :)

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-121608: Add supporting perf trampoline on -linux-musl #122370

[corona10]

@nekopsykose

Hi, which linux distro did you tested?
I would like to cross check the changes work correctly.
see: #122370 (comment) and #122370 (comment)

[nekopsykose]

chimera-linux (container at docker.io/chimeralinux/chimera)

works fine with the (released) frame pointer version of perf support, i haven't tried dwarf myself with the new unreleased changes (i see in those mr comments the tests get skipped for whatever reason)

[nekopsykose]

ah, yeah, reading https://docs.python.org/3.14/howto/perf_profiling.html#how-to-work-without-frame-pointers indeed the perf is just too old on alpine, because they package linux-tools from the lts release (which doesn't make sense to me, but..). i guess it'll work fine with the newer ones