Re: Help needed on strange random error (Guile 2.0.9)

[Sun Yijiang]

I managed to narrow the problem down to this:

(abbreviated code snippets)

/* from app.c */
static void init_builtins(void*) {
    scm_c_define_gsubr(...)
    scm_c_export(...)
    ...
}

static void _main(void *data, int argc, char* argv[]) {
    // smob definitions
    DEFINE_SMOB(....)
    ...

    scm_c_define_module("builtin", init_builtins, NULL);
    scm_c_eval_string(
        "(current-warning-port (%make-void-port \"w\"))"
        "(read-set! keywords 'prefix)"
        "(add-to-load-path \"/my/scm/path\")"
        "(use-modules (builtin) (ice-9 readline)) (activate-readline)"
        );
    scm_shell(argc, argv);
}

int main(int argc, char* argv[]) {
    scm_boot_guile(argc, argv, _main, 0);
    return 0;
}
/* end of app.c */

If I remove (use-modules (builtin)) but leave everything else the
same, the problem goes away.  I can say I found a fix, but I still
don't know the cause.

Any idea?

Best,
Steve

2013/12/7 Ludovic Courtès <address@hidden>
>
> Sun Yijiang <address@hidden> skribis:
>
> > It's an application using Guile for extensions, involving a bunch of C++ /
> > Scheme code and need an environment to run, so I'm afraid it's not quite
> > possible to post them here.  Besides, there are commercial secrets included.
> >
> > I know it's hard to get any help with such little infomation.  I'll try to
> > post an example script that can reproduce this problem.
>
> That would be great.
>
> > Still, any hint on where I can start looking into this problem?
>
> First, in what context does ‘@@’ occur in the source?  Normally you
> should rarely need to use it, but if you do, the correct syntax is:
>
>   (@@ (foo) bar)
>
> which looks up private top-level variable ‘bar’ in module (foo).
>
> Second, the expression is being evaluated instead of run from compiled
> code (hence the ‘eval’ in the backtrace.)  You should arrange to run
> compiled code instead, for instance by using ‘primitive-load’, which
> would auto-compile the source if needed.
>
> HTH,
> Ludo’.