Yes, I had built perl from source with debugging via Potrs (set DEBUG option for the port either in /etc/make.conf or via "dialog" brought up with make config in the port directory); at the end of "perl -V" ... 

...
Characteristics of this binary (from libperl):
  Compile-time options:
    DEBUGGING
    HAS_TIMES
    MULTIPLICITY
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
...

[download]

I had rebuilt DateTime again (from source, with perl with debugging) in case I might not have removed all of its dependencies. No difference.

I will try later to build perl & DateTime outside of Ports, but does not look like that would help any given the evidence so far.

In reply to Re^4: perl built with -DDEBUGGING causes "failed to extend arg stack" error with XS modules by parv
in thread perl built with -DDEBUGGING causes "failed to extend arg stack" error with XS modules by parv

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