7.15.1 Variable argument list access macros

• 7.15.1.1 The va_arg macro
• 7.15.1.2 The va_copy macro
• 7.15.1.3 The va_end macro
• 7.15.1.4 The va_start macro

1

The va_start and va_arg macros described in this subclause shall be implemented as macros, not functions. It is unspecified whether va_copy and va_end are macros or identifiers declared with external linkage. If a macro definition is suppressed in order to access an actual function, or a program defines an external identifier with the same name, the behavior is undefined. Each invocation of the va_start and va_copy macros shall be matched by a corresponding invocation of the va_end macro in the same function.