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Re: Empty entries in $GUILE_LOAD_PATH

From: Ludovic Courtès
Subject: Re: Empty entries in $GUILE_LOAD_PATH
Date: Tue, 15 May 2012 19:13:38 +0200
User-agent: Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.93 (gnu/linux)

Hi Mark,

Mark H Weaver <address@hidden> skribis:

> address@hidden (Ludovic Courtès) writes:
>> Try something like:
>>   $ GUILE_LOAD_PATH=/foo/bar: make check
>> … and see the LALR tests fail with:
>>   ERROR: In procedure primitive-load-path: Unable to find file
>> "home/ludo/src/guile/test-suite/lalr/common-test.scm" in load path
>> (These tests use ‘load’.)
>> Is that expected?  What’s the meaning of empty entries in the load path?
> It seems to me that a valid load path should never contain empty
> entries, because the empty string is not a valid path.

Apparently ‘search_path’ has always treated "" as the current directory:

  $ guile
  GNU Guile
  Copyright (C) 1995-2012 Free Software Foundation, Inc.

  Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
  This program is free software, and you are welcome to redistribute it
  under certain conditions; type `,show c' for details.

  Enter `,help' for help.
  scheme@(guile-user)> (not (not (member "" %load-path)))
  $1 = #t
  scheme@(guile-user)> (chdir "/etc")
  scheme@(guile-user)> (search-path '("") "resolv.conf")
  $2 = "resolv.conf"

(Same with 1.8.)

So we probably can’t change that.

>> Should ‘meta/uninstalled-env’ & co. clear $GUILE_LOAD_PATH?
> I don't see why it should.

Actually the problem was:

  scheme@(guile-user)> (set! %load-path (cons "" %load-path))
  scheme@(guile-user)> (with-fluids ((%file-port-name-canonicalization 
                         (port-filename (open-input-file "/dev/null")))
  $1 = "dev/null"

I just fixed it.  Comments welcome!


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