Add LLVM flags to limit DWARF version to 2 on BSD #77765
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Certain platforms need to limit the DWARF version emitted (oxs, *bsd). This change adds a dwarf_version entry to the options that allows a platform to specify the dwarf version to use. By default this option is none and the default DWARF version is selected. Also adds an option for printing Option<u32> json keys
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Thanks, sorry for all the iterations. I squashed it all into one commit, and added the error message. Please let me know if there's anything else. |
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Rollup of 8 pull requests Successful merges: - rust-lang#77765 (Add LLVM flags to limit DWARF version to 2 on BSD) - rust-lang#77788 (BTreeMap: fix gdb provider on BTreeMap with ZST keys or values) - rust-lang#77795 (Codegen backend interface refactor) - rust-lang#77808 (Moved the main `impl` for FnCtxt to its own file.) - rust-lang#77817 (Switch rustdoc from `clean::Stability` to `rustc_attr::Stability`) - rust-lang#77829 (bootstrap: only use compiler-builtins-c if they exist) - rust-lang#77870 (Use intra-doc links for links to module-level docs) - rust-lang#77897 (Move `Strip` into a separate rustdoc pass) Failed merges: - rust-lang#77879 (Provide better documentation and help messages for x.py setup) - rust-lang#77902 (Include aarch64-pc-windows-msvc in the dist manifests) r? `@ghost`
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This has been a thorn in my side for a while, I can finally generate flamegraphs of rust programs on bsd again. This fixes dtrace profiling on freebsd, I think it might help with lldb as well but I can't test that because my current rust-lldb setup is messed up.
I'm limiting the dwarf version to 2 on all bsd's (netbsd/openbsd/freebsd) since it looks like this applies to all of them, but I have only tested on freebsd.
Let me know if there's anything I can improve!
Currently on FreeBSD dtrace profiling does not work and shows jumbled/incorrect
symbols in the backtraces. FreeBSD does not support the latest versions of DWARF
in dtrace (and lldb?) yet, and needs to be limited to DWARF2 in the same way as macos.
This adds an is_like_bsd flag since it was missing. NetBSD/OpenBSD/FreeBSD all
match this.
This effectively copies #11864 but targets FreeBSD instead of macos.