gcc 8.2.0: missing _fileno() for c++11

Hello, all

After an upgrade to 8.2.0, gcc can no longer find the
_fileno function.  The following program:

#include <stdio.h>

int main( void )
{  FILE *f;
   _fileno( f );
   return 0;
}

saved in test.cpp, will not compile with:

    gcc -std=c++11 test.cpp

but compiles with:

    gcc test.cpp

This function is (conditinally?) defined in:

    [mingw]\include\stdio.h

What may be the problem with c++11?

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