Hi Mike, Thanks, but va_arg is not my function. It is a standard library function (stdarg.h) which is implemented and documented by Renesas, see page 545 of the RL-CC compiler manual. On page 546, a usage example is given: #include stdarg.h void func(arg-declarations, ...) { va_list ap; type argN; va_start(ap, last-named-argument); argN= va_arg(ap, type); va_end(ap); } This is all standard usage of standard library functions. They are implemented by Renesas, not me. Hence the issue, a warning is generated when using the standard library variable arguments function. BR, Sjef.
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