12:41 PM
最初のmainからまっすぐここに突入する
12:44 PM
// If we don't have to do any cleanup work, just exec the subprocess. if (Level < OutputLevel::Parseable && !ShowDriverTimeCompilation && (SaveTemps || TempFilePaths.empty()) && CompilationRecordPath.empty() && Jobs.size() == 1) { return performSingleCommand(Jobs.front().get()); }
12:45 PM
jobが1つの場合の最適化なのかも。