If you are using single line comment '//' and end it with the line-continuation sign '' it shows warnings in all places where this occurs ( c and h files ).

I agree with Andy.

Regardless of whether or not we're talking about doing it in a macro or not, using a line-continuation sign at the end of a single-line comment is either redundant or counter-productive, depending on how you look at it.

The correct operation for a 'C' compiler that encounters a single-line comment of // is for the compiler to ignore absolutely everything that follows on that line, up to and including the next CR/LF. It is not important whether there is a line-continuation sign at the end of the line because the compiler should ignore it--and everything else that follows //.

When in doubt:

Use // for single-line comments.

Use /* */ for multi-line comments and in macros.

Craig Steiner