Rule 16-0-1 and extern "C"

[detra]

Hello,
if we want to use the same Header files for "C" and "C++" we must use the "extern C" constuct. But the "extern C" construct must be placed before the include of the Header and so our tool reports a MISRA 16-0-1 violation. Is this violation valid? And if so, is there an other solution?

Code:

#ifndef _MYHEADER_
#define _MYHEADER_

extern "C"
{
    #include "firstheader.h"                // MISRA 16-0-1 violation
}

Thank you for help,
Stefan