I assume that your system is a

  for linux, it seems only 32bit systems are supported,
mainly because there is no stack validation code for 64-bit target...

  The list of supported targets is in: systems_support_checkpointer

For version 3.0.0:
systems.pas:342:       systems_support_checkpointer =
systems.pas-343-                             + [system_i386_win32]
systems.pas-344-                             + [system_i386_GO32V2]
systems.pas-345-                             + [system_i386_os2]
systems.pas-346-                             +
systems.pas-347-                             + [system_powerpc_morphos];

  Anyhow, this code seems also broken for i386-linux...

 I just committed two fixes to trunk, 
it is possible to cycle compiler now with -gc option
on both i386 and x86_64 linux.
  As the fix is not cpu specific, I enabled the -gc option
for all linux systems in trunk, but this is untested.

  So if you are using linux OS, -gc option is probably only usable
starting with today's trunk commits.


> -----Message d'origine-----
> De : fpc-pascal-boun...@lists.freepascal.org [mailto:fpc-pascal-
> boun...@lists.freepascal.org] De la part de Graeme Geldenhuys
> Envoyé : mercredi 21 septembre 2016 14:35
> À : fpc-pascal@lists.freepascal.org
> Objet : Re: [fpc-pascal] with no if assigned() there are bugs
> On 2016-09-21 13:27, Pierre Free Pascal wrote:
> >    There is also the -gc option:
> >       -gc        Generate checks for pointers
> Interesting, I didn't know about that option.
> Unfortunately under CentOS 6 Linux I get:
> Fatal: Option "-gc" is not, or not yet, supported on the current target
> platform
> Do you know which platforms support the -gc option? Windows, FreeBSD?
> Regards,
>   Graeme
> --
> fpGUI Toolkit - a cross-platform GUI toolkit using Free Pascal
> http://fpgui.sourceforge.net/
> My public PGP key:  http://tinyurl.com/graeme-pgp
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