refactor nvcc subcommands into a struct, remap nvcc temp file names s…

…o we get cache hits in scenarios we should

Cargo.toml

@@ -121,6 +121,7 @@ rouille = { version = "3.6", optional = true, default-features = false, features
 syslog = { version = "6", optional = true }
 version-compare = { version = "0.1.1", optional = true }
 shlex = "=1.3.0"
+itertools = "0.12"
 
 [dev-dependencies]
 assert_cmd = "2.0.13"

src/compiler/cicc.rs

@@ -195,7 +195,13 @@ pub async fn preprocess(
     parsed_args: &ParsedArguments,
 ) -> Result<process::Output>
 {
-    std::fs::read(cwd.join(&parsed_args.input))
+    // cicc and ptxas expect input to be an absolute path
+    let input = if parsed_args.input.is_absolute() {
+        parsed_args.input.clone()
+    } else {
+        cwd.join(&parsed_args.input)
+    };
+    std::fs::read(input)
         .map_err(|e| { anyhow::Error::new(e) })
         .map(|s| {
             process::Output {