rustc_codegen_llvm: don't generate any type debuginfo for -Cdebuginfo=1. #69080
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I've removed the commit with the FIXMEs, and I think we can just land this PR as-is. @nagisa @hanna-kruppe Do either of you want to review this? |
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⌛ Testing commit bcfddd9b883f1b19f5aca7ce450fed22ca4cd355 with merge 64c5abdf57876e69861591d6ad757ffa4dd7a76c... |
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💔 Test failed - checks-azure |
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@bors r=michaelwoerister |
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@bors retry |
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Rollup of 8 pull requests Successful merges: - rust-lang#69080 (rustc_codegen_llvm: don't generate any type debuginfo for -Cdebuginfo=1.) - rust-lang#69940 (librustc_codegen_llvm: Replace deprecated API usage) - rust-lang#69942 (Increase verbosity when suggesting subtle code changes) - rust-lang#69968 (rustc: keep upvars tupled in {Closure,Generator}Substs.) - rust-lang#70123 (Ensure LLVM is in the link path for rustc tools) - rust-lang#70159 (Update the bundled wasi-libc with libstd) - rust-lang#70233 (resolve: Do not resolve visibilities on proc macro definitions twice) - rust-lang#70286 (Miri error type: remove UbExperimental variant) Failed merges: r? @ghost
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Works towards #69074 by adding more checks for
DebugInfo::Fullin a few places inrustc_codegen_llvm, bringing us in line with whatclang -g1generates (no debuginfo types, nor debuginfo forstatics).My local build's (
debuginfo-level=1,debug-assertions=1)librustc_driver-*.sowent from just over 1GiB (1019MiB) down to 402MiB.It's still bad, but the
.debug_*sections themselves (as reported byobjdump) went from something like 853MiB down to 236MiB, i.e. roughly a 3.6x reduction.Sadly, I don't think this is enough to justify shipping all of this debuginfo, but now it's more plausible that we could at least build with
debuginfo-level=1then strip it.That would give us real backtraces for e.g. ICEs during builds, but I don't know how often that's relevant.
We could also look into split DWARF, and maybe have a
rustc-debuginfocomponent inrustup.There's also the possibility of making it slimmer by omitting parameters to functions, or perhaps some deduplication (I think right now there is no DWARF reuse across CGUs? maybe ThinLTO helps?).
r? @michaelwoerister cc @rust-lang/wg-codegen @alexcrichton @Mark-Simulacrum