standalone: Add command line flags for target properties

For testing codegen for different platforms on the host system.

flake.lock

@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1693636127,
-        "narHash": "sha256-ZlS/lFGzK7BJXX2YVGnP3yZi3T9OLOEtBCyMJsb91U8=",
+        "lastModified": 1694183432,
+        "narHash": "sha256-YyPGNapgZNNj51ylQMw9lAgvxtM2ai1HZVUu3GS8Fng=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9075cba53e86dc318d159aee55dc9a7c9a4829c1",
+        "rev": "db9208ab987cdeeedf78ad9b4cf3c55f5ebd269b",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.05",
+        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,7 +1,7 @@
 {
   description = "The third-generation ARTIQ compiler";
 
-  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-23.05;
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
 
   outputs = { self, nixpkgs }:
     let

nac3standalone/src/main.rs

@@ -6,7 +6,7 @@ use inkwell::{
     OptimizationLevel,
 };
 use parking_lot::{Mutex, RwLock};
-use std::{borrow::Borrow, collections::HashMap, fs, mem::transmute, path::Path, sync::Arc};
+use std::{borrow::Borrow, collections::HashMap, fs, path::Path, sync::Arc};
 
 use nac3core::{
     codegen::{
@@ -207,7 +207,13 @@ fn main() {
         .map(|arg| if arg == "native" { host_target_machine.cpu.clone() } else { arg })
         .unwrap_or_default();
     let target_features = target_features.unwrap_or_default();
-    let opt_level: OptimizationLevel = unsafe { transmute(opt_level) };
+    let opt_level = match opt_level {
+        0 => OptimizationLevel::None,
+        1 => OptimizationLevel::Less,
+        2 => OptimizationLevel::Default,
+        // The default behavior for -O<n> where n>3 defaults to O3 for both Clang and GCC
+        _ => OptimizationLevel::Aggressive,
+    };
 
     let program = match fs::read_to_string(file_name.clone()) {
         Ok(program) => program,