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Re: Issues with ubuntu 18.04


From: Paulo Moura
Subject: Re: Issues with ubuntu 18.04
Date: Fri, 26 Mar 2021 07:56:24 +0000

The Ubuntu .deb package is broken. You need to compile and install GNU Prolog 
from sources.

> On 25 Mar 2021, at 21:25, Jerry Hancock <jerry@hanler.com> wrote:
> 
> Hello,  
> 
> Please excuse me for asking about something so old.  I installed gnu-prolog 
> 1.4.5 on ubuntu server 18.04.  The underlying hardware is an HP dl380 with at 
> least 24 cores.  I had some code that runs perfectly but slowly on other 
> servers so I thought I would try my cloud server.
> 
> The test code is simple and instantiated in sit3.pl:
> 
> c(blue).
> c(green).
> 
> sit3(X):-c(X).
> 
> On my other installations, the first solution X=blue is returned as 
> expected..  On the ubuntu server 18.04 , I get an error, "uncaught exception 
> error(existence_error(procedure,c/0),sit3/0) “ implying that c/0 doesn’t 
> exist but I’m not calling c/0 I’m calling c/1 as below:
> 
> {trace}
> | ?- sit3(X).
>       1    1  Call: sit3(_24) ? 
>       2    2  Call: c ? 
>       2    2  Exception: c ? 
>       1    1  Exception: sit3(_24) ? 
> uncaught exception: error(existence_error(procedure,c/0),sit3/0)
> {trace}
> | ?- 
> 
> If I assert the clauses from the terminal, all is well.
> 
> If I run c(X), trace returns:
> 
> | ?- c(X).
>       1    1  Call: c(_24) ? 
>       1    1  Exit: c(blue) ? 
> 
> X = blue ? 
> 
> Or 
> 
> | ?- asserta(cc(blue)).
> 
> yes
> | ?- asserta(cc(green)).
> 
> yes
> | ?- asserta((sit33(X):-cc(X))).
> 
> yes
> | ?- sit33(X).
> 
> X = green ? 
> 
> 
> This is a very simple example that should work.  I’ve been working with 
> prolog since the late 80’s and unless there is an ini file that is note 
> allowing the clauses to be added correctly, I could't find it.
> 
> Thanks




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