[fpc-devel] Re: [fpc-pascal] Calling unassigned procedure gives no stack trace with -gl

Marco van de Voort marcov at stack.nl
Fri Jul 15 08:42:55 CEST 2005

> > > 
> > > So, where should a solution come from?  Where in the software/hardware
> > > chain would a change be needed to make it work properly?
> > 
> > For *nix: prt/crt0, there is a xorl %ebp,%ebp  But there might be code
> > that relies on this (main program's parent's frame being nil)
> (Continuing the thread from the fpc-pascal list on fpc-devel.)
> But why then is a stack trace generated for the unhandled assert exception
> and not for the unhandled access violation (under Linux 386)?

The first is a called procedure, the other an exception handler I guess
(Peter already hinted at that). 
> Under Mac OS X (Darwin), I do get stack traces in both cases.  However,
> in spite of compiling with -gl, I don't get line numbers in either case.
> What is the cause for that?

I don't know, but FPC/Darwin's startup mechanisms are afaik a bit different
due to the mandatory libc use on Darwin. Linux and FreeBSD are by default
still free of libc.

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