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Re: FFI on OS X?

From: Ludovic Courtès
Subject: Re: FFI on OS X?
Date: Thu, 03 Mar 2011 00:03:54 +0100
User-agent: Gnus/5.110013 (No Gnus v0.13) Emacs/23.2 (gnu/linux)


Hans Aberg <address@hidden> writes:

> On 2 Mar 2011, at 21:44, Ludovic Courtès wrote:
>>> scheme@(guile-user)> (define libm (dynamic-link "/usr/lib/libm.dylib"))
>>> ERROR: In procedure dynamic-link: file: "/usr/lib/libm.dylib",
>>> message: "file not found"
>> You should omit the extension, which will be automatically inferred by
>> Guile (actually ltdl) depending on the system:
>>  (dynamic-link "/usr/lib/libm")
>> or:
>>  (dynamic-link "libm")
> None of those work - I checked and rechecked that. Making a soft link ending 
> on ".so", and it works fine. I have seen this before in the Bessel function 
> example.

Right.  There’s this insightful test started by you last year:

The crux is that on older MacOS X versions ‘.dylib’ are shared libraries
(not dlopenable), whereas ‘.so’ are “bundles” (dlopenable).  That’s why
lt_dlopenext (which is what ‘dynamic-link’ uses) doesn’t try to open
‘.dylib’ files.

May I recommend switching to GNU/Linux?  :-)


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