Compiler Warning (level 4) C4212
Collapse the table of content
Expand the table of content
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer

Compiler Warning (level 4) C4212

Error Message

nonstandard extension used : function declaration used ellipsis

The function prototype has a variable number of arguments. The function definition does not.

The following sample generates C4212:

// C4212.c
// compile with: /W4 /Ze /c
void f(int , ...);
void f(int i, int j) {}
© 2015 Microsoft