Compiler Warning (level 1) C4920
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 1) C4920

Error Message

enum enum member member=value already seen in enum enum as member=value

If a .tlb that you pass to #import has the same symbol defined in two or more enums, this warning indicates that subsequent identical symbols are ignored and will be commented out in the .tlh file.

Assuming a .tlb that contains:

library MyLib
    typedef enum {
        enumMember = 512
    } AProblem;

    typedef enum {
        enumMember = 1024
    } BProblem;

the following samples generates C4920,

// C4920.cpp
// compile with: /W1
#import "t4920.tlb"   // C4920

int main() {
© 2016 Microsoft