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Don't link gomp on MSVC (openmp-runtime-comp) #144

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Merged
jkawamoto merged 1 commit into from
Jul 18, 2026
+13 −2
Merged

Don't link gomp on MSVC (openmp-runtime-comp) #144

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15 changes: 13 additions & 2 deletions ct2rs/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -171,7 +171,14 @@ fn build_ctranslate2() {
library_paths.push(PathBuf::from(env::var("DEP_DNNL_LIBRARY_PATH").unwrap()));
}
if openmp_comp {
println!("cargo:rustc-link-lib=gomp");
// `gomp` is GNU's OpenMP runtime and does not exist on the MSVC toolchain,
// where linking it fails with `LNK1181: cannot open input file 'gomp.lib'`.
// MSVC's `/openmp` emits a `/DEFAULTLIB:VCOMP` directive into every object, so
// its OpenMP runtime is linked automatically and nothing is needed here. Other
// toolchains, including `*-pc-windows-gnu` (MinGW/GCC), still require it.
if env::var("CARGO_CFG_TARGET_ENV").as_deref() != Ok("msvc") {
println!("cargo:rustc-link-lib=gomp");
}
cmake.define("OPENMP_RUNTIME", "COMP");
} else if openmp_intel {
println!("cargo:rustc-link-lib=iomp5");
Expand Down Expand Up @@ -363,7 +370,11 @@ fn link_system_libraries() {
println!("cargo:rustc-link-lib=dnnl");
}
if cfg!(feature = "openmp-runtime-comp") {
println!("cargo:rustc-link-lib=gomp");
// See the note above: `gomp` does not exist on MSVC (LNK1181); its OpenMP
// runtime is linked automatically via the /DEFAULTLIB:VCOMP directive.
if env::var("CARGO_CFG_TARGET_ENV").as_deref() != Ok("msvc") {
println!("cargo:rustc-link-lib=gomp");
}
}
if cfg!(feature = "openmp-runtime-intel") {
println!("cargo:rustc-link-lib=iomp5");
Expand Down
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