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On NixOS find cudatoolkit via which nvcc, fixes #92. #93

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On NixOS find cudatoolkit via which nvcc, fixes #92. #93

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20 changes: 20 additions & 0 deletions crates/find_cuda_helper/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
//! Tiny crate for common logic for finding and including CUDA.

use std::process::Command;
use std::{
env,
path::{Path, PathBuf},
Expand Down Expand Up @@ -131,6 +132,7 @@ pub fn find_cuda_lib_dirs() -> Vec<PathBuf> {
candidates.push(e)
}
candidates.push(PathBuf::from("/usr/lib/cuda"));
candidates.push(detect_cuda_root_via_which_nvcc());

let mut valid_paths = vec![];
for base in &candidates {
Expand All @@ -150,6 +152,24 @@ pub fn find_cuda_lib_dirs() -> Vec<PathBuf> {
valid_paths
}

#[cfg(not(target_os = "windows"))]
fn detect_cuda_root_via_which_nvcc() -> PathBuf {
let output = Command::new("which")
.arg("nvcc")
.output()
.expect("Command `which` must be available on *nix like systems.")
.stdout;

let path: PathBuf = String::from_utf8(output)
.expect("Result must be valid UTF-8")
.trim()
.to_string()
.into();

// The above finds `CUDASDK/bin/nvcc`, so we have to go 2 up for the SDK root.
path.parent().unwrap().parent().unwrap().to_path_buf()
}

#[cfg(target_os = "windows")]
pub fn find_optix_root() -> Option<PathBuf> {
// the optix SDK installer sets OPTIX_ROOT_DIR whenever it installs.
Expand Down