On Thu, Sep 19, 2013 at 8:20 AM, David Oswald <daosw...@gmail.com> wrote:
> On Wed, Sep 18, 2013 at 3:49 PM, Lars Dɪᴇᴄᴋᴏᴡ 迪拉斯 <da...@cpan.org> wrote: > >> how to cause an install of > >> List::BinarySearch to attempt to download and install > >> List::BinarySearch::XS (a separate distribution) > > Include the prerequisite conditionally at configure time. The condition > > is whether xsubpp/cccmd can compile a dummy XS file. > > That's too late, isn't it? If the user types, "cpan install > List::BinarySearch", Makefile.PL doesn't get executed until after the > target module is pulled in. Prereqs are specified in the > distribution's META.* files. By the time Makefile.PL is run, the > installer is done pulling in prereqs. The goal is for a cpan > installer to pull in the XS distribution and attempt to install it. > Failure not block the PP module from completing its install. > The META.* is only used for configure_requires (and dynamic_config to some extent). After Makefile.PL/Build.PL the cpan client will read the dependencies from the mymeta file, or lacking that from the Makefile itself/build parameters file. Leon
