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Fix Windows CUDA 12.8.1 LLVM discovery in rustc_codegen_nvvm #412

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Fix Windows CUDA 12.8.1 LLVM discovery in rustc_codegen_nvvm #412

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6b350f4
Initial plan
Copilot Sep 21, 2026
c907856
Probe CUDA_PATH for Windows LLVM
Copilot Sep 21, 2026
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21 changes: 15 additions & 6 deletions crates/rustc_codegen_nvvm/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,12 @@ static PREBUILT_LLVM_URL_LLVM7: &str =
"https://github.com/rust-gpu/rustc_codegen_nvvm-llvm/releases/download/llvm-7.1.0/";
static PREBUILT_LLVM_URL_LLVM19: &str =
"https://github.com/rust-gpu/rustc_codegen_nvvm-llvm/releases/download/llvm-19.1.7/";
static CUDA_ROOT_ENVS: &[&str] = &[
"CUDA_HOME",
"CUDA_PATH",
"CUDA_ROOT",
"CUDA_TOOLKIT_ROOT_DIR",
];

fn main() {
let flavor = if llvm19_enabled() { &LLVM19 } else { &LLVM7 };
Expand Down Expand Up @@ -174,12 +180,15 @@ fn find_llvm_config(target: &str, flavor: &LlvmFlavor) -> PathBuf {

candidates.push(PathBuf::from(flavor.default_binary));

if flavor.probe_cuda_home
&& let Some(cuda_home) = tracked_env_var_os("CUDA_HOME")
{
let cuda_home = PathBuf::from(cuda_home);
candidates.push(cuda_home.join("nvvm").join("bin").join("llvm-config"));
candidates.push(cuda_home.join("bin").join("llvm-config"));
if flavor.probe_cuda_home {
for cuda_root in CUDA_ROOT_ENVS
.iter()
.filter_map(tracked_env_var_os)
.map(PathBuf::from)
{
candidates.push(cuda_root.join("nvvm").join("bin").join("llvm-config"));
candidates.push(cuda_root.join("bin").join("llvm-config"));
}
}

for candidate in &candidates {
Expand Down
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