Re: `scm_c_read ()' and `swap_buffer' trick harmful

[Miroslav Lichvar]

On Sun, Nov 23, 2008 at 10:30:19PM +0000, Neil Jerram wrote:
> 2008/11/21 Ludovic Courtès <address@hidden>:
> > I confirm it works with CBIPs in Guile-R6RS-Libs, but I had to make this
> > small change:
> >
> >  
> > http://repo.or.cz/w/guile-r6rs-libs.git?a=commitdiff;h=dfab2fe21f82bc40cfdf9a3a3eeb6936d5935c8c
> >
> > IOW, with Guile up to 1.8.5, it was harmless to leave `read_buf_size'
> > uninitialized (actually, zeroed), which was OK since CBIPs don't use it,
> > but the change in `scm_c_read ()' makes it necessary to initialize it.
> > It's probably a reasonable expectation, though.
> 
> Hmm.  I agree that this isn't ideal.  I guess it's OK for now though.
> 
> > Please commit!
> 
> Thanks, doing that now.

It seems that the optimizations broke lilypond, it's now failing with
this message:

ports.c:978: scm_fill_input: Assertion `pt->read_pos == pt->read_end' failed.

A bug report is here:
https://bugzilla.redhat.com/show_bug.cgi?id=477007

Reverting bed2e15f and 1d17348b fixes the problem, is this a lilypond
or guile bug?

Thanks,

-- 
Miroslav Lichvar