Re: [Next browser] Common Lisp: mgl-pax: Package SWANK-BACKEND does not exist.

[Andy Patterson]

Hey Pierre,

On Tue, 28 Aug 2018 21:18:39 +0200
Pierre Neidhardt <address@hidden> wrote:

> Thanks for the details.
> 
> Here is the full backtrace when I attempt to build sbcl-slime-swank
> with PR #433 (https://github.com/slime/slime/pull/433):
> 

[...]

> ; 
> /gnu/store/223af099vkzml89z1y8m654clsja8xph-sbcl-slime-swank-2.22/lib/sbcl/contrib/swank-mrepl-tmp10401X32.fasl
> written ; compilation finished in 0:00:00.039
> ; compiling file
> "/gnu/store/223af099vkzml89z1y8m654clsja8xph-sbcl-slime-swank-2.22/share/common-lisp/sbcl-source/swank/contrib/swank-listener-hooks.lisp"
>  (written
> 28 AUG 2018 07:14:51 PM): ; compiling (IN-PACKAGE :SWANK) ; compiling
> (SWANK-REQUIRE :SWANK-REPL) ;
> file: 
> /gnu/store/223af099vkzml89z1y8m654clsja8xph-sbcl-slime-swank-2.22/share/common-lisp/sbcl-source/swank/contrib/swank-listener-hooks.lisp
>  ;
> in: EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE) ;
> (SWANK:SWANK-REQUIRE :SWANK-REPL) ; 
> ; caught WARNING:
> ;   SWANK-REPL also exports the following symbols:
> ;     (SWANK-REPL:LISTENER-SAVE-VALUE SWANK-REPL:REDIRECT-TRACE-OUTPUT
> ;      SWANK-REPL:CLEAR-REPL-VARIABLES SWANK-REPL:CREATE-REPL
> ;      SWANK-REPL:LISTENER-GET-VALUE SWANK-REPL:LISTENER-EVAL)
> ;   See also:
> ;     The ANSI Standard, Macro DEFPACKAGE
> ;     The SBCL Manual, Variable SB-EXT:*ON-PACKAGE-VARIANCE*

This is definitely the most suspicious block for me; it looks just like
the problem that's causing our slynk package to fail building.  I don't
know much about the various eval-when options, but
removing :compile-toplevel and :load-toplevel in a snippet fixes the
problem in slynk - and the require wasn't needed because asdf already
sets up that kind of dependency loading.  I'm not sure if that'll also
be the case here but it's probably worth giving a try.

Hoping that helps,

--
Andy