Namespace Abseil to prevent symbol collisions across dependencies

.github/workflows/ci.yml

@@ -317,6 +317,11 @@ jobs:
           pattern: src_binding_*.rs
           merge-multiple: true
 
+      - name: Commit modified abseil options.h
+        run: |
+          git add third_party/abseil-cpp/absl/base/options.h
+          git commit -m "chore: commit modified abseil options.h"
+
       - name: Publish
         env:
           CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

build.rs

@@ -325,6 +325,17 @@ fn build_v8(is_asan: bool) {
     gn_args.push(r#"target_cpu="x86""#.to_string());
   }
 
+  let repo_root = env::current_dir().unwrap();
+  let abseil_options_path = repo_root
+    .join("third_party")
+    .join("abseil-cpp")
+    .join("absl")
+    .join("base")
+    .join("options.h");
+
+  set_abseil_options_to_use_namespace(&abseil_options_path)
+    .expect("Failed to modify options.h");
+
   let gn_out = run_gn_gen(&gn_args);
   assert!(gn_out.exists());
   assert!(gn_out.join("args.gn").exists());
@@ -1079,6 +1090,36 @@ fn env_bool(key: &str) -> bool {
   )
 }
 
+fn set_abseil_options_to_use_namespace(
+  options_path: &PathBuf,
+) -> io::Result<()> {
+  // Read the contents of options.h
+  let current_content = fs::read_to_string(options_path)?;
+
+  // Create the expected content
+  let new_content = current_content
+    .lines()
+    .map(|line| {
+      if line.contains("#define ABSL_OPTION_USE_INLINE_NAMESPACE") {
+        "#define ABSL_OPTION_USE_INLINE_NAMESPACE 1".to_string()
+      } else if line.contains("#define ABSL_OPTION_INLINE_NAMESPACE_NAME") {
+        "#define ABSL_OPTION_INLINE_NAMESPACE_NAME v8".to_string()
+      } else {
+        line.to_string()
+      }
+    })
+    .collect::<Vec<String>>()
+    .join("\n");
+
+  // Only write if content actually changed
+  if current_content != new_content {
+    let mut file = fs::File::create(options_path)?;
+    file.write_all(new_content.as_bytes())?;
+  }
+
+  Ok(())
+}
+
 #[cfg(test)]
 mod test {
   use super::*;