Release 0.22

[viktormalik]

It's been a while since we did the last release and we have a lot of unreleased stuff already.

Let's discuss here what needs to be included in the release.

As discussed some while ago, we may want to consider crafting a release branch before the actual release to enable pulling new features into master while not blocking the release.

[viktormalik]

At the moment, we have one issue tagged into v0.22:

• Deleting scalar map just zeros out the entry #3498

From the other issues, these should be considered:

• Regression printing large struct #3557
• JSON Output for Type::none Fields #3543
• Crash when trying to print() hist #3540

From the open PRs, we should IMO wait for:

• Fix variable scoping issues: #3550
• cmake: Bump max LLVM version to 19 #3433

LLVM 19 support is tricky as Nix will only have LLVM 19 in 24.11 which is planned for Nov 22 (NixOS/nixpkgs#339153). To speed things up, we could switch to unstable for a while just to get the testing coverage for LLVM 19.

[hhoffstaette]

• cmake: Bump max LLVM version to 19 #3433

If it helps: I added support for LLVM 19 to my Gentoo build of bpftrace-0.21.2 and it works without a hitch. Other than CI I don't see why this shouldn't be enabled, since distros are still free to use -18.

[viktormalik]

Also we need #3561 to make sure that a released version depends on a released libbpf.

[jordalgo]

@viktormalik Thanks for getting this going.

we may want to consider crafting a release branch

+1 for this.

• Crash when trying to print() hist #3540

I fixed half of this issue with: #3542. I can try to look into the other part soon.

• Fix variable scoping issues: #3550

This is merged now though TBH I'm slightly nervous I didn't think of or catch all the weird edge cases around block scoping and variable ordering. This is another reason I'm pro "release branch".

• cmake: Bump max LLVM version to 19 #3433

I'm a little unclear why we want to wait for this for a release but I'm a little out of my depth.

[viktormalik]

Sorry, I just noticed that I never replied to this.

• cmake: Bump max LLVM version to 19 #3433

I'm a little unclear why we want to wait for this for a release but I'm a little out of my depth.

B/c many rolling distros (like Fedora) have LLVM 19 in their latest releases so we definitely want the new bpftrace release support LLVM 19. It would just be nice to also get test coverage from CI and for that we need new nixpkgs release to happen (which should come in the following days).