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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.

Compiler Warning (level 4) C4211

Error Message

nonstandard extension used : redefined extern to static

With the default Microsoft extensions (/Ze), you can redefine an extern identifier as static.

Example

// C4211.c
// compile with: /W4
extern int i;
static int i;   // C4211

int main()
{
}

Such redefinitions are invalid under ANSI compatibility (/Za).

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