Added comment to explain why only RustIstaller has `llvm_tools = false`.

diff --git a/src/bootstrap/tool.rs b/src/bootstrap/tool.rs
index 595fe0ab9ad7a516dfeaff8f74f59282592254cc..0c164d86332a815cd215b77d99c12dc6596a538e 100644 (file)
--- a/src/bootstrap/tool.rs
+++ b/src/bootstrap/tool.rs
@@ -340,6 +340,9 @@ fn run(self, builder: &Builder) -> PathBuf {
     }
 }
 
+// FIXME(#51459): We have only checked that RustInstaller does not require
+// the LLVM binaries when running. We should go through all tools to determine
+// if they really need LLVM binaries, and make `llvm_tools` a required argument.
 tool!(
     Rustbook, "src/tools/rustbook", "rustbook", Mode::ToolRustc;
     ErrorIndex, "src/tools/error_index_generator", "error_index_generator", Mode::ToolRustc;