Re: Problem with clisp package.

[Kaz Kylheku <kaz at ashi dot footprints dot net>]

The packaged CLISP is built using libsigsegv. However, that library is
not packaged with it, so it's not possible to do custom links of CLISP,
which some CLISP-based applications need to do!

(That is to say, some programs add their own C functions to CLISP by
adding them to the set of pieces from which CLISP is made to link
a custom image.  These pieces, static libs really, are collectively
called a ``linking set''.  When CLISP is built and installed, it
creates two linking sets by default, in $PREFIX/lib/clisp/base and
$PREFIX/lib/clisp/full representing a minimal and fully featured
image, respectively. CLISP includes a ``linkkit'' mechanism by which
new linking sets can be constructed based on adding material to existing
ones.)

Anyway, the packaged CLISP wants to link in -lsigsegv which it expects
to find in /usr/local/libsigsegv-cygin/lib.  It's an external piece,
not part of the linking set.  This reference is found
in the makevars file of both the base and full linking set:
/usr/lib/clisp/{base,full}/makevars.

The very location of the reference is fishy in itself since a package
unstalled in /usr shouldn't refer to /usr/local stuff!

It looks like the package was built against a locally installed
libsigsegv, introducing a dependency which was then overlooked.

If you don't have libsigsegv, CLISP will build without it; it's not an
essential dependency. In that case the makevars files will end up with
-DNO_SIGGSEGV in CFLAGS, and there is no reference to -lsigsegv in the
LIBS variable.  In other words, rebuilding CLISP from scratch without
installing libsigsegv at all is one way to cure the problem. Another
fix would be to have a proper Cygwin package for this lib and make it a
dependency.

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