[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Mac OS X .dylib not working

From: Bob Friesenhahn
Subject: Re: Mac OS X .dylib not working
Date: Tue, 2 Feb 2010 10:52:35 -0600 (CST)
User-agent: Alpine 2.01 (GSO 1266 2009-07-14)

On Tue, 2 Feb 2010, Hans Aberg wrote:

On 2 Feb 2010, at 15:20, Ken Raeburn wrote:

On Mac OS X (trying it on 10.5.8 PPC G4), guile-1.8.7 cannot open
dynamic library files with name extensions .dylib, but only if they
are renamed using .so instead. On the Bug-Guile list they say it
just calls libltdl, in the libtool package. I have installed latest
of both, but the problem persists:

libtool should produce modules named *.so on Darwin if you pass the
-module flag at link time.  Typically, -avoid-version is used for
modules as well.

But dlopen() on Mac OS X can only open files in the native format, which isn't ELF, and they are typically named with the .dylib file name extension. If it finds a .so file on ELF format, all it does is reporting it cannot be opened.

".so" doesn't mean ELF format, and on some systems including Mac OS X, "dynamically linked shared library" (e.g., a ".dylib" file) is not the same as "dynamically loadable object". Did you not see my earlier email to you and the bug-guile list?

The fact is that currently Guile, which relies on libtool, cannot open .dylib files, though it works perfectly if they are renamed .so. As for what filenames to use, dlopen() does not care - it is something imposed by libtool. Also, all new native DLLs (see below) on Mac OS X are named .dylib.

Unless I am missing something, the question to be answered is if Guile requests opening modules using a name like "module.so" (assuming a particular naming scheme), "module.la" (using libltdl as originally intended), or bare "module" (using libltdl heuristics, which tries several incantations, such as looking for .la, and .so).

OS-X's module loading does not care about the file extension.

Under OS-X (Leopard and later), the 'dtruss' program can be used to see what is really going on.

Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

reply via email to

[Prev in Thread] Current Thread [Next in Thread]