Compiler Warning (level 4) C4204

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nonstandard extension used : non-constant aggregate initializer

With Microsoft extensions (/Ze), you can initialize aggregate types (arrays, structures, unions, and classes) with values that are not constants.

Example

// C4204.c
// compile with: /W4
int func1()
{
   return 0;
}
struct S1
{
   int i;
};

int main()
{
   struct S1 s1 = { func1() };   // C4204
   return s1.i;
}

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