[Lazarus] What's "External: SIGFPE"?

[Xiangrong Fang]

Hi All,

I am making a charting program and encountered very weird error.   The
exception raised is: 'External: SIGFPE'. In file 'lcltype.pp' at line
3009.   On that line is the MulDiv() function, and the operation I am doing
is just assigning font height.   I then remembered the question i asked
days ago about 1/0 and Ln(0).  Sven suggested to use SetExceptionMask.

I tried this in my FormCreate:

  SetExceptionMask([exInvalidOp, exDenormalized, exZeroDivide, exOverflow,
exUnderflow]);

Now the program crashes every time it start.   I also tested to put the
above line on an empty project, same error happened in gtk2winapi.inc!

Could anyone explain what's SIGFPE? Why there is a SetExceptionMask? Why a
normal empty form application will generate SIGFPE with these masks, and
how to trace down to the cause of this error?

Thanks a lot!
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