Re: [PATCH v5 2/3] Makefile: add Perl runtime prefix support

> On Mon, 08 Jan 2018, Ævar Arnfjörð Bjarmason replied:
> 
> >>+# it. This is intentionally separate from RUNTIME_PREFIX so that
> >>notably Windows +# can hard-code Perl library paths while still
> >>enabling RUNTIME_PREFIX +# resolution.
> >
> > Maybe we covered this in previous submissions, but refresh my memory,
> > why is the *_PERL define still needed? Reading this explanation
> > doesn't make sense to me, but I'm probably missing something.
> >
> > If we have a system where we have some perl library paths on the
> > system we want to use, then they'll still be in @INC after our 'use
> > lib'-ing, so we'll find libraries there.
> >
> > The only reason I can think of for doing this for C and not for Perl
> > would be if you for some reason want to have a git in /tmp/git but
> > then use a different version of the Git.pm from some system install,
> > but I can't imagine why.
> 
> The reason is entirely due to the way Git-for-Windows is structured. In
> Git-for-Windows, Git binaries are run directly from Windows, meaning
> that they require RUNTIME_PREFIX resolution. However, Perl scripts are
> run from a MinGW universe, within which filesystem paths are fixed.
> Therefore, Windows Perl scripts don't require a runtime prefix
> resolution.