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Make [rust] use-lld=true work on windows #100464

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Aug 14, 2022
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Make [rust] use-lld=true work on windows #100464

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7 changes: 6 additions & 1 deletion src/bootstrap/compile.rs
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Expand Up @@ -658,7 +658,12 @@ impl Step for Rustc {

// With LLD, we can use ICF (identical code folding) to reduce the executable size
// of librustc_driver/rustc and to improve i-cache utilization.
if builder.config.use_lld {
//
// -Wl,[link options] doesn't work on MSVC. However, /OPT:ICF (technically /OPT:REF,ICF)
// is already on by default in MSVC optimized builds, which is interpreted as --icf=all:
// https://github.com/llvm/llvm-project/blob/3329cec2f79185bafd678f310fafadba2a8c76d2/lld/COFF/Driver.cpp#L1746
// https://github.com/rust-lang/rust/blob/f22819bcce4abaff7d1246a56eec493418f9f4ee/compiler/rustc_codegen_ssa/src/back/linker.rs#L827
if builder.config.use_lld && !compiler.host.contains("msvc") {
cargo.rustflag("-Clink-args=-Wl,--icf=all");
}

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