Chapter 4
Debugging
Perl comes with a command line debugger similar to the popular gdb C debugger. 
If you've never used the Perl debugger before, you should look at the perldebug
documentation to get started. To run the Perl debugger on a single test.pl test 
script, use the command make testdb:
$ make testdb
PERL_DL_NONLAZY=1 /usr/local/bin/perl  d  Iblib/arch  Iblib/lib \
 I/usr/local/lib/perl5/5.6.1/i686 linux  I/usr/local/lib/perl5/5.6.1 test.pl
Default die handler restored.
Loading DB routines from perl5db.pl version 1.07
Editor support available.
Enter h or  h h  for help, or  man perldebug  for more help.
1..1
main::(test.pl:4):      ok(1); # If we made it this far, we re ok.
  DB<1>
However, if you're using a t directory of test scripts, then a simple make testdb won't 
work. This is because the debugger will only work on a single script. To use the 
debugger on a single .t file, include the option TEST_FILE. For example, to run 
t/02basic.t under the debugger, you would use the following command:
make testdb TEST_FILE=t/02basic.t
Multimodule Distributions
A module distribution can contain more than one module file. A common use for 
packaging multiple files in a distribution is to install a family of modules in a 
common namespace. For example, the HTML::Template::JIT
15
 module distribution 
contains the three modules HTML::Template::JIT, HTML::Template::JIT::Compiler, 
and HTML::Template::JIT::Base. The main module file, JIT.pm, is placed where you 
would expect it in the module distribution directory. The other two, Compiler.pm
and Base.pm, are placed in a directory called JIT. Makefile.PL automatically finds 
the two submodules and installs them along with JIT.pm.
15. HTML::Template::JIT provides a just in time compiler for HTML::Template. The module was 
written by myself, Sam Tregar, and is available on CPAN.
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