Examples

#pragma push
#pragma diag_suppress 177
void foo1(void)
{
    /* Warning #177-D (variable was declared but never referenced) suppressed */
    int x;
}
#pragma pop
      
void foo2(void)
{
    /* Warning #177-D (variable was declared but never referenced) generated */
    int x;
}

This example shows two identical functions, foo1() and foo2(), both of which would normally provoke warning #177-D (variable was declared but never referenced).

For the first function, foo1(), #pragma diag_suppress suppresses the warning. However, because the #pragma diag_suppress is wrapped by a #pragma push and #pragma pop pair, the warning is re-enabled by #pragma pop.