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Re: Passing C pointers through guile

From: Ludovic Courtès
Subject: Re: Passing C pointers through guile
Date: Fri, 11 Jul 2008 16:42:03 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux)


"Kjetil S. Matheussen" <address@hidden> writes:

> The code in question doesn't run on those platforms anyway,
> since there's a lot of strict linux stuff.

You are certainly aware that GNU/Linux *is* available on sparc64, alpha,

> However, I don't the storage of pointers in unsigned longs (which is a
> perfectly legal thing to do if done correctly), would pose any problem
> for running it on other hardware.

Again, it's not "perfectly legal", no matter whether you do it
"correctly" (whatever that means) or not: the C standard makes no
provision regarding the size of `long' versus the size of pointer types.
It happens to work on the mainstream platforms you're using, but it's
definitely not portable.

And I suppose that's the reason why you want `scm_{to,from}_uintptr ()'
in the first place, otherwise you'd just live (dangerously) with
`scm_{to,from}_unsigned_long ()'.


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