[Patch, Fortran] Print floating-point exception status after STOP/ERROR STOP

[Tobias Burnus]

Eric, Gerald, all,

I have now committed (Rev. 200360) the attached patch. (Compared to the 
draft patch, with a missing "," added in AC_CHECK_TYPES).

Eric, Gerald: Can you confirm that it now works on both FreeBSD and Solaris?

Eric: Should one (conditionally) include <floatingpoint.h> on Solaris? I 
am asking because LIBGFOR_CHECK_FPSETMASK in acinclude.m4 uses that 
include file during configure - but libgfortran.h (or config/fpu-sysv.h) 
don't.

Tobias
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