Hello,

"Bill Schottstaedt" <bil@ccrma.Stanford.EDU> writes:

> This is trickier than I thought -- it's not the GC after all.  In my configure
> script for Snd, autoconf defines _FILE_OFFSET_BITS to 64 if large files are implemented.
> The config.h "include" precedes everything else.  When scm_getc is called
> within guile, it thinks sizeof(scm_t_port) is 92.  Everything is fine until
> my skip comment procedure is called (with this 92 byte struct) -- it
> thinks the scm_t_port size is 104, and fields like rw_active (in scm_getc
> which is apparently expanded inline) are not where it expects them to be!
> If I undef _FILE_OFFSET_BITS, both agree on the struct size, and there
> is no problem.  

Ouch!  That's a good illustration of the harm that can be done by
exposing data structures.

The attached patch adds a new `scm_t_off' type, whose definition does
not depend on the application's `_FILE_OFFSET_BITS' value.  Can you
confirm that it allows you to build Guile with 32-bit offsets and Snd
with 64-bit offsets (or vice versa)?

Neil: Does this sound like the right approach?

Thanks,
Ludo'.