Message Opening comment delimiter found inside a delimited comment; a previous comment may be missing its closing delimiter. Description C comments delimited by /* */ do not nest. When /* is encountered inside a delimited comment it usually means that the previous comment is missing its terminating */ or that the user has ill-advisedly attempted to "comment out" a section of code that contains a delimited comment. User Action It is traditional in C to use #if 0 to conditionalize out large sections of code. You may also want to consider //-style comments if the compiler modes you care about recognize them.