[Bug libfortran/63930] libgfortran should use 'abort ()' instead of 'exit (2)' for run-time errors

["anlauf at gmx dot de" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63930

Harald Anlauf <anlauf at gmx dot de> changed:

           What    |Removed                     |Added
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                 CC|                            |anlauf at gmx dot de

--- Comment #2 from Harald Anlauf <anlauf at gmx dot de> ---
I think that there is a fundamental need to rewrite the handling of
runtime errors in gfortran.  Since 4.7 I do often not get useful
backtraces with certain kinds of fatal errors like array-bounds
violation, see PR/53739.  I use the patch I suggested there in my
private installations, but this doesn't help my colleagues at work.

I think a fatal runtime error does not require a nice termination
of the program, including closing of files etc.
However, this might require a general review - and classification -
of runtime errors:

- fatal (illegal operations like bad pointers/addresses etc.)
- severe (e.g. failed ALLOCATE?)
- soft (e.g. "file not found" in an OPEN statement)

I'm not sure where I'd place floating point exceptions; their
severity might even be configurable.

(Note: I'm writing this as nobody seems to care about PR/53739).