Add -Wno-unknown-warning-option to ignore gcc warnings options

Author: ogoffart

generator/main.cpp

@@ -253,6 +253,7 @@ static bool proceedCommand(std::vector<std::string> command, llvm::StringRef Dir
     command.push_back("-isystem");
     command.push_back("/builtins");
     command.push_back("-Qunused-arguments");
+    command.push_back("-Wno-unknown-warning-option");
     clang::tooling::ToolInvocation Inv(command, new BrowserAction(WasInDatabase), FM);
 
     // Map the builtins includes