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Use -Z threads=0 option in config_fast_builds.toml #11541

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merged 2 commits into from
Jan 29, 2024
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Use -Z threads=0 option in config_fast_builds.toml #11541

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835ebd1
Use `-Z threads=8` option in `config_fast_builds.toml`
doonv Jan 26, 2024
a977c7e
Use `-Z threads=0` instead of `8`
doonv Jan 27, 2024
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10 changes: 8 additions & 2 deletions .cargo/config_fast_builds.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ linker = "clang"
rustflags = [
"-Clink-arg=-fuse-ld=lld", # Use LLD Linker
"-Zshare-generics=y", # (Nightly) Make the current crate share its generic instantiations
"-Zthreads=0", # (Nightly) Use improved multithreading with the recommended amount of threads.
]

# NOTE: you must install [Mach-O LLD Port](https://lld.llvm.org/MachO/index.html) on mac. you can easily do this by installing llvm which includes lld with the "brew" package manager:
Expand All @@ -16,17 +17,22 @@ rustflags = [
rustflags = [
"-Clink-arg=-fuse-ld=/usr/local/opt/llvm/bin/ld64.lld", # Use LLD Linker
"-Zshare-generics=y", # (Nightly) Make the current crate share its generic instantiations
"-Zthreads=0", # (Nightly) Use improved multithreading with the recommended amount of threads.
]

[target.aarch64-apple-darwin]
rustflags = [
"-Clink-arg=-fuse-ld=/opt/homebrew/opt/llvm/bin/ld64.lld", # Use LLD Linker
"-Zshare-generics=y", # (Nightly) Make the current crate share its generic instantiations
"-Zthreads=0", # (Nightly) Use improved multithreading with the recommended amount of threads.
]

[target.x86_64-pc-windows-msvc]
linker = "rust-lld.exe" # Use LLD Linker
rustflags = ["-Zshare-generics=n"]
linker = "rust-lld.exe" # Use LLD Linker
rustflags = [
"-Zshare-generics=n",
"-Zthreads=0", # (Nightly) Use improved multithreading with the recommended amount of threads.
]

# Optional: Uncommenting the following improves compile times, but reduces the amount of debug info to 'line number tables only'
# In most cases the gains are negligible, but if you are on macos and have slow compile times you should see significant gains.
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