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Codegen issues commonly only manifest under specific circumstances, e.g. if multiple codegen units are used and ThinLTO is enabled. However, these configuration are threaded, making the use of LLVM debugging facilities hard, as output is interleaved. This patch adds a -Z no-parallel-llvm flag, which allows disabling parallelization of codegen and linking, while otherwise preserving behavior with regard to codegen units and LTO.
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r? @estebank (rust_highfive has picked a reviewer for you, use r? to override) |
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It LGTM, but have little background re this LLVM flag |
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kennytm
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Add -Z no-parallel-llvm flag Codegen issues commonly only manifest under specific circumstances, e.g. if multiple codegen units are used and ThinLTO is enabled. However, these configuration are threaded, making the use of LLVM debugging facilities hard, as output is interleaved. This patch adds a -Z no-parallel-llvm flag, which allows disabling parallelization of codegen and linking, while otherwise preserving behavior with regard to codegen units and LTO.
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Rollup of 9 pull requests Successful merges: - #50864 (Add NetBSD/arm target specs) - #50956 (rust-gdb: work around the re-used -d argument in cgdb) - #50964 (Make sure that queries have predictable symbol names.) - #50965 (Update LLVM to pull in another wasm fix) - #50972 (Add -Z no-parallel-llvm flag) - #50979 (Fix span for type-only arguments) - #50981 (Shrink `LiveNode`.) - #50995 (move type out of unsafe block) - #51011 ( rustdoc: hide macro export statements from docs) Failed merges:
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Jul 31, 2023
Because it's usefulness wasn't clear to me, and I initially wondered if it could be removed. The text is based on the text in rust-lang#50972, the PR that added the flag.
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Codegen issues commonly only manifest under specific circumstances,
e.g. if multiple codegen units are used and ThinLTO is enabled.
However, these configuration are threaded, making the use of LLVM
debugging facilities hard, as output is interleaved.
This patch adds a -Z no-parallel-llvm flag, which allows disabling
parallelization of codegen and linking, while otherwise preserving
behavior with regard to codegen units and LTO.