feat: add eval/build.rs

eval/build.rs

@@ -1,7 +1,66 @@
+use std::fs;
+use std::path::{Path};
+use std::process::Command;
+
+fn needs_rebuild(program_dir: &Path, elf_path: &Path) -> bool {
+    if !elf_path.exists() {
+        return true;
+    }
+
+    let elf_modified = fs::metadata(elf_path)
+        .and_then(|m| m.modified())
+        .unwrap_or_else(|_| std::time::SystemTime::UNIX_EPOCH);
+
+    fs::metadata(program_dir)
+        .and_then(|m| m.modified())
+        .map_or(true, |dir_modified| dir_modified > elf_modified)
+}
+
 fn main() {
     vergen::EmitBuilder::builder()
         .build_timestamp()
         .git_sha(true)
         .emit()
-        .unwrap();
-}
+        .expect("Failed to generate vergen information");
+
+    let programs_dir = Path::new("../programs");
+
+    if let Ok(entries) = fs::read_dir(programs_dir) {
+        for entry in entries.flatten() {
+            let path = entry.path();
+            if path.is_dir() {
+                let program_name = path.file_name().unwrap().to_str().unwrap();
+
+                let target = if program_name.ends_with("-risc0") {
+                    "riscv32im-risc0-zkvm-elf"
+                } else {
+                    "riscv32im-succinct-zkvm-elf"
+                };
+
+                let elf_dir = path.join("elf");
+                let elf_path = elf_dir.join(target);
+
+                if !needs_rebuild(&path, &elf_path) {
+                    continue;
+                }
+
+                fs::create_dir_all(&elf_dir).expect("Failed to create elf directory");
+
+                let status = Command::new("cargo")
+                    .current_dir(&path)
+                    .args(&[
+                        "build",
+                        "--release",
+                        "--target", target,
+                        "--out-dir", elf_dir.to_str().unwrap(),
+                    ])
+                    .status()
+                    .expect("Failed to execute cargo build");
+
+                if !status.success() {
+                    panic!("Failed to build program: {}", program_name);
+                }
+            }
+        }
+    }
+}