[mcclim-devel] [PATCH] Make CLX loadable for CLISP

[Evgeny M. Zubok]

Recently, someone in this mailing-list pointed to the problem that CLX
was not loaded during McCLIM compilation process in CLISP. Indeed,
:clim-clx loading for was disabled for CLISP. I fix it.

CLISP has it's own two implementations of CLX -- new-clx and
mit-clx. Their presence can be enabled or disabled with CLISP configure
script's options --with-module=clx/new-clx or
--with-module=clx/mit-clx. First, we verify availability of :xlib
package. If :xlib doesn't exist, then we load CLX from ASDF. Otherwise,
some heuristic applied to detect what implementation provided with
CLISP: if the symbol `set-selection-owner' is not declared as exported,
we have implementation (new-clx, I suppose) that currently cannot be
used as McCLIM backend. In this case, we unlock :xlib and try to replace
it with CLX from ASDF.

I tried mit-clx (predecessor of telent-clx) as McCLIM's backend two
years ago, and it worked. But, AFAIR, I read (I don't remember where)
that something (and I don't remember what) would not work with this
implementation and also that the implementation hasn't being updated for
a long time. I think the right decision is to leave it as possible
backend for a while and don't replace it with telent CLX from ASDF.

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