[Insight-developers] I/O factory loading needs to be updated for Intel Macs/Mac OS 10.4 (easy fix)

[Stefan Klein]

Hi Neil,

I found the same bug (or actually, somebody else, who compiled my code on a 
mac).

In the itksys directory (<your-itk-binary-dir>\Utilities\itksys) you can 
find another DynamicLoader, which is more up-to-date and works well on new 
Apples (and also on old ones i guess). Its interface is almost the same, 
and you can include it with the following statement:

#include <itksys/DynamicLoader.hxx>

the class 'lives' in the itksys namespace by the way.

Question to the ITK-gurus: Why does the itk::DynamicLoader not use the 
itksys::DynamicLoader internally?

Regards,
Stefan.



At 15:34 20/07/06, Neil Weisenfeld wrote:
>I'm a fairly new Mac owner and am relying on a custom I/O factory that 
>I've written for ITK.
>
>Currently, builds on my Intel-based MacBook Pro (OS/X 10.4.7) cause a bus 
>error when trying to load my custom module (but keep reading).
>
>The ITK dynamic loading stuff in Code/Common/itkDynamicLoader.cxx has a 
>special case for #ifdef __APPLE_.  This makes use of deprecated functions 
>in order to perform dynamic module loading.  Simply disabling this special 
>__APPLE__ case on my builds allows the normal Unix (dlopen, etc.) code 
>path to be compiled in and this works correctly.
>
>If this only applies to the Intel Macs, then a quick fix is to change
>
>#if defined( __APPLE__ )
>to
>#if defined(__APPLE__) && !defined(__i386__)
>
>should do the trick, however this Apple tech note seems to indicate that 
>the method in use is simply deprecated (Apple says "discouraged"):
>
>http://developer.apple.com/documentation/DeveloperTools/Reference/MachOReference/Reference/reference.html
>
>It would be nice if this were fixed in the official release for me and the 
>slicer branch as this breaks Slicer, too.  I guess I'm one of a small 
>number of people who are using loadable I/O factories.  I'm not sure what 
>the best fix is: are there still people running ITK on platforms that 
>require the older NSLinkModule stuff, etc?  Maybe we can hear from some 
>Mac experts in the audience.
>
>
>Regards,
>Neil
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