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build: enable parallel rustc frontend via -Zthreads=8 #30761

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build: enable parallel rustc frontend via -Zthreads=8 #30761

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2 changes: 2 additions & 0 deletions scripts/build/rust.ts
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Expand Up @@ -412,6 +412,8 @@ export function emitRust(n: Ninja, cfg: Config, inputs: RustBuildInputs): string
: // armv8-a+crc isn't a CPU name — closest LLVM model with CRC baseline:
"cortex-a72";
rustflags.push(`-Ctarget-cpu=${cpuTarget}`);
// Parallelize the otherwise single-threaded rustc frontend (nightly-only).
rustflags.push("-Zthreads=8");

@RiskyMH RiskyMH May 15, 2026

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I wonder if it should check os.availableParallelism() and only use if 8+ to avoid overloading on less powerful builds

// `bun_core::build_options::ENABLE_ASAN = cfg!(bun_asan)` — must agree with
// the C++ `ASAN_ENABLED` macro so Global::exit() picks the same libc exit
// path (`exit` vs `quick_exit`) that c-bindings.cpp registered Bun__onExit on.
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