When you run perl Makefile.PL, a
Makefile is created. This
Makefile includes the same compilation options
that were used to build Perl itself. They are stored in the
Config.pm module and can be displayed with the
Perl -V command. All these options are reapplied
when compiling Perl modules.
If you use a different compiler to build Perl extensions, chances are
that the options this compiler uses won't be the
same, or they might be interpreted in a completely different way. So
the code may not compile, may dump core, or may behave in unexpected
ways.
Since Perl, Apache, and third-party modules all work together under
mod_perl, it's essential to use the same compiler
while building each of the components.
If you compile a non-Perl component separately, you should make sure
to use both the same compiler and the same options used to build
Perl. You can find much of this information by running perl
-V.
