These messages report common, but sometimes unconventional, use of C or C++. The compiler does not print or display remarks unless you specify level 4 for the -W option, as described in Suppressing Warning Messages or Enabling Remarks. Remarks do not stop translation or linking. Remarks do not interfere with any output files. The following are some representative remark messages:
function declared implicitly
type qualifiers are meaningless in this declaration
controlling expression is constant