1 files changed, 4 insertions, 0 deletions
diff --git a/clang-tools-extra/clangd/Protocol.h b/clang-tools-extra/clangd/Protocol.h
index bfa7757b1b1..b62e57f5dda 100644
--- a/clang-tools-extra/clangd/Protocol.h
+++ b/clang-tools-extra/clangd/Protocol.h
@@ -368,6 +368,10 @@ struct InitializationOptions {
   ConfigurationSettings ConfigSettings;
 
   llvm::Optional<std::string> compilationDatabasePath;
+  // Additional flags to be included in the "fallback command" used when
+  // the compilation database doesn't describe an opened file.
+  // The command used will be approximately `clang $FILE $fallbackFlags`.
+  std::vector<std::string> fallbackFlags;
 };
 bool fromJSON(const llvm::json::Value &, InitializationOptions &);