Check for metal and/or CUDA support through build.rs and activate Kalosm features when available

Author: lucksus

Diff for: Cargo.lock

@@ -23,6 +23,13 @@ include = [
 name = "rust_executor"
 path = "src/lib.rs"
 
+[features]
+# Pass metal and cuda features (set through build.rs) through to kalosm
+default = []
+metal = ["kalosm/metal"]
+cuda = ["kalosm/cuda"]
+
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
@@ -99,7 +106,7 @@ rustls = "0.23"
 tokio-rustls = "0.26"
 rustls-pemfile = "2"
 
-kalosm = { version = "0.3.2", git = "https://github.com/coasys/floneum.git", rev = "44e05c5fe6fc72eaeaf6ccefbf8269cda54aca75", features = ["language", "metal"] }
+kalosm = { version = "0.3.2", git = "https://github.com/coasys/floneum.git", rev = "44e05c5fe6fc72eaeaf6ccefbf8269cda54aca75", features = ["language"] }
 deflate = "1.0.0"
 
 [dev-dependencies]

Diff for: rust-executor/Cargo.toml

@@ -0,0 +1,16 @@
+use std::process::Command;
+
+fn main() {
+    // Try to detect if CUDA is installed by checking if `nvcc` is available
+    let cuda_available = Command::new("nvcc").arg("--version").output().is_ok();
+
+    // If CUDA is available, enable the `cuda` feature
+    if cuda_available {
+        println!("cargo:rustc-cfg=feature=\"cuda\"");
+    }
+
+    // If building on macOS, enable `metal` feature by default
+    if cfg!(target_os = "macos") {
+        println!("cargo:rustc-cfg=feature=\"metal\"");
+    }
+}