John Peacock wrote:
Except that violates the chosen mode I am operating in:
1) The XS module (being completely equivalent to Perl 5.10.0 is the
default) is the default backend;
2) If the machine being installed on cannot support XS, then provide a
pure Perl implementation (read slower) for those poor benighted souls
without access to a C-compiler or a PPM repository.
I suppose I'll have to go this route to support all bases.
I don't see the real difference. All the PL files should do is create the
.pm or .xs or .c files -- you can still default one way or another. The way
I think of it, there are two possible distribution layouts, one for XS as
the backend, the other for a PP backend. The .PL files job is only to make
the layout resemble one or the other case.
For example, in Pod::WikiDoc, I include a precompiled Parse::RecDescent
parser. The grammer sits in the __DATA__ section of the .PL file, and the
.PL file just loads that up and passes it to PRD for compilation, which
generates the .pm file.
What I'm suggesting (and I think Ken is) it to have a version.xs.PL file in
the right place, with the XS in the __DATA__ section. If there's a C
compiler available, slurp DATA and write it to the .xs file; if there's no C
compiler available, then don't create it. Ditto for .c files.
For the .pm file, put both the stub version and PP version in __DATA__ with
an appropriate separator line (e.g. '__SEPARATOR__' ) between the two. Slurp
DATA and split on the separator. If the C compiler exists, write the stub
content into the .pm. If not, write the PP content into the .pm.
That way, after .PL processing, the /lib directory looks right for either C
compilation or pure Perl, and the rest of the Build cycle can just do the
right thing on that basis. I think that's easier than trying to
subclass/override the process_* sections.
David
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