Debugging mod_perl startup

mreece has asked for the wisdom of the Perl Monks concerning the following question:

i have found myself in a situation where perl -e 'use MyApp' compiles fine, but

<Perl>
  use MyApp;
</Perl>
[download]

dies with errors. It would be nice if I could use the perl debugger during the apache startup, but the docs for Apache::DB are pretty thin.

what strategies might i pursue to figure out why my module fails to load under Apache/1.3.36 (Unix) mod_perl/1.29? i have been skimming http://perl.apache.org/docs/1.0/guide/debug.html but it seems that my options are to use gdb for startup and Apache::DB for debugging requests.

is there any way to use the perl debugger during apache startup?

update: i have of course verified that @INC is the same in both scenarios..

update 2: i managed to track down my problem the hard way (turns out Rose::DB::Object does things a little differently when $ENV{MOD_PERL}), but the general question still stands: is there any way to use the perl debugger during apache startup?

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Re: Debugging mod_perl startup by perrin (Chancellor) on Mar 09, 2007 at 04:27 UTC
Try setting PERL5OPT=-d before starting apache.	[reply]
Re: Debugging mod_perl startup by jesuashok (Curate) on Mar 09, 2007 at 01:19 UTC
I use apache's log file, to find out all the errors happening during apache startup.	[reply]
Re^2: Debugging mod_perl startup by mreece (Friar) on Mar 09, 2007 at 01:41 UTC
not that it matters, but these errors were printed to screen, not to log. the question was not what are the errors, but what was causing them.	[reply]

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