sync llvm submodule during config parse

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/core/config/config.rs

@@ -2730,19 +2730,23 @@ impl Config {
  asserts: bool,
  ) -> bool {
  let if_unchanged = || {
- // Git is needed to track modifications here, but tarball source is not available.
- // If not modified here or built through tarball source, we maintain consistency
- // with '"if available"'.
- if !self.rust_info.is_from_tarball()
- && self
- .last_modified_commit(&["src/llvm-project"], "download-ci-llvm", true)
- .is_none()
- {
- // there are some untracked changes in the given paths.
- false
- } else {
- llvm::is_ci_llvm_available(self, asserts)
+ if self.rust_info.is_from_tarball() {
+ // Git is needed for running "if-unchanged" logic.
+ println!(
+ "WARNING: 'if-unchanged' has no effect on tarball sources; ignoring `download-ci-llvm`."
+ );
+ return false;
  }
+
+ self.update_submodule("src/llvm-project");
+
+ // Check for untracked changes in `src/llvm-project`.
+ let has_changes = self
+ .last_modified_commit(&["src/llvm-project"], "download-ci-llvm", true)
+ .is_none();
+
+ // Return false if there are untracked changes, otherwise check if CI LLVM is available.
+ if has_changes { false } else { llvm::is_ci_llvm_available(self, asserts) }
  };
 
  match download_ci_llvm {