WIP ci: experiment with clang check

wasm/prover/Cargo.toml

@@ -77,9 +77,16 @@ console_error_panic_hook = {version = "0.1.7"}
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.34"
+rstest = "0.18.2"
 
 [profile.release]
 # Tell `rustc` to optimize for small code size.
 
 [package.metadata.wasm-pack.profile.release]
 wasm-opt = false
+
+[build-dependencies]
+regex = "1.10.2"
+
+[package.metadata.build-script]
+name = "build.rs"

wasm/prover/build.rs

@@ -0,0 +1,58 @@
+use regex::Regex;
+use std::{error::Error, process::Command};
+
+fn main() {
+    let raw_output = Command::new("clang")
+        .arg("--version")
+        .output()
+        .expect("Could not verify clang version. Is clang installed?") //TODO add url here
+        .stdout;
+    let clang_version_str = std::str::from_utf8(&raw_output)
+        .expect("Could not verify clang version. Is clang installed?");
+    let clang_version = get_major_version(clang_version_str)
+        .expect(format!("Could not verify clang version. {:?}?", &clang_version_str).as_str());
+
+    if clang_version < 16 {
+        panic!("Please install clang version 16.0 or newer.");
+    }
+}
+
+fn get_major_version(clang_raw_version_output: &str) -> Result<u32, Box<dyn Error>> {
+    let version_pattern = r#"version (\d+(\.\d+)+)"#;
+    let re = Regex::new(version_pattern).unwrap();
+
+    if let Some(captures) = re.captures(clang_raw_version_output) {
+        let version = captures.get(1).map_or("", |m| m.as_str());
+        if let Some(major_vesrion) = version.split('.').next() {
+            return Ok(major_vesrion.parse::<u32>().unwrap());
+        }
+    }
+
+    return Err(format!(
+        "Could not verify clang version. {:?}?",
+        &clang_raw_version_output
+    )
+    .into());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rstest::rstest;
+
+    #[rstest]
+    #[case("Apple clang version 15.0.0 (clang-1500.0.40.1)
+Target: arm64-apple-darwin23.1.0
+Thread model: posix
+InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin", "15.0.0")]
+    #[case(
+        "Homebrew clang version 17.0.5
+Target: arm64-apple-darwin23.1.0
+Thread model: posix
+InstalledDir: /opt/homebrew/Cellar/llvm/17.0.5/bin",
+        "17.0.5"
+    )]
+    fn test_get_version(#[case] clang_output: &str, #[case] expected: &str) {
+        assert_eq!(get_major_version(clang_output), Some(expected));
+    }
+}

wasm/prover/check.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+cargo check --target "wasm32-unknown-unknown"