GNU bug report logs - #12459
Strange issue with circular dependancies

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: rixed <at> happyleptic.org
To: bug-guile <at> gnu.org
Subject: Strange issue with circular dependancies
Date: Mon, 17 Sep 2012 13:48:08 +0200

[Message part 1 (text/plain, inline)]

While the compiler does manage most circular dependancies, some cases still
cannot be compiled.

For instance, with the attached circ-{a,b,c}.scm the compilation of b fails
with:

% GUILE_LOAD_PATH=. guile-tools compile -Warity-mismatch -Wformat -Wunused-variable -Wduplicate-case-datum -Wbad-case-datum -o circ-b.go circ-b.scm
Backtrace:
In ice-9/boot-9.scm:
2131: 19 [save-module-excursion #<procedure 2648a80 at ice-9/boot-9.scm:2787:17 ()>]
2797: 18 [#<procedure 2648a80 at ice-9/boot-9.scm:2787:17 ()>]
In unknown file:
   ?: 17 [primitive-load-path "circ-a" #f]
In ice-9/eval.scm:
 487: 16 [#<procedure 210ac60 at ice-9/eval.scm:481:4 (exp)> (use-modules # #)]
In ice-9/psyntax.scm:
1091: 15 [expand-top-sequence ((use-modules (circ-b) (circ-c))) () ...]
 976: 14 [scan ((use-modules (circ-b) (circ-c))) () ...]
 270: 13 [scan ((# #) #(syntax-object *unspecified* # #)) () (()) ...]
In ice-9/boot-9.scm:
3258: 12 [process-use-modules (((circ-b)) ((circ-c)))]
 621: 11 [map #<procedure 21d8fe0 at ice-9/boot-9.scm:3258:25 (mif-args)> ((#) (#))]
3259: 10 [#<procedure 21d8fe0 at ice-9/boot-9.scm:3258:25 (mif-args)> ((circ-c))]
2594: 9 [resolve-interface (circ-c) #:select ...]
2519: 8 [#<procedure 21cb760 at ice-9/boot-9.scm:2507:4 (name #:optional autoload version #:key ensure)> # ...]
2786: 7 [try-module-autoload (circ-c) #f]
2131: 6 [save-module-excursion #<procedure 26507b0 at ice-9/boot-9.scm:2787:17 ()>]
2797: 5 [#<procedure 26507b0 at ice-9/boot-9.scm:2787:17 ()>]
In unknown file:
   ?: 4 [primitive-load-path "circ-c" #f]
In ice-9/eval.scm:
 435: 3 [eval #<memoized (define y (@ (circ-b) fb))> ()]
 432: 2 [eval #<memoized (@ (circ-b) fb)> ()]
In unknown file:
   ?: 1 [memoize-variable-access! #<memoized (@ (circ-b) fb)> #f]
In ice-9/boot-9.scm:
 106: 0 [#<procedure 23e9100 at ice-9/boot-9.scm:97:6 (thrown-k . args)> unbound-variable ...]

ice-9/boot-9.scm:106:20: In procedure #<procedure 23e9100 at ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: In procedure module-lookup: Unbound variable: fb

Note that it compiles if you remove (circ-c) from used-modules in circ-a.scm.

[circ-a.scm (text/plain, attachment)]

[circ-b.scm (text/plain, attachment)]

[circ-c.scm (text/plain, attachment)]

Message #8 received at 12459 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: rixed <at> happyleptic.org
Cc: 12459 <at> debbugs.gnu.org
Subject: Re: bug#12459: Strange issue with circular dependancies
Date: Fri, 23 Nov 2012 23:44:49 +0100

Hi,

rixed <at> happyleptic.org skribis:

> While the compiler does manage most circular dependancies, some cases still
> cannot be compiled.

It’s really not supposed to work, neither at compile time nor at run time.

Sometimes it turns out to work “by chance” as in this case, or because
there are autoloads to defer the cycle.  But in general, it should
really be avoided.

Won’t fix?  :-)

Ludo’.

Message #11 received at 12459 <at> debbugs.gnu.org (full text, mbox):

From: rixed <at> happyleptic.org
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 12459 <at> debbugs.gnu.org
Subject: Re: bug#12459: Strange issue with circular dependancies
Date: Mon, 26 Nov 2012 09:54:19 +0100

> Won???t fix?  :-)

Fine with me.
I couldn't name a single compiler that can handle circular dependancies.

Message #16 received at 12459-done <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: 12459-done <at> debbugs.gnu.org
Cc: rixed <at> happyleptic.org
Subject: Re: bug#12459: Strange issue with circular dependancies
Date: Tue, 27 Nov 2012 22:38:20 +0100

tags 12459 wontfix
thanks

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