Thursday, January 13, 2011

Finding Python (for PyObjC) 3


Just a short post to say that I asked about this on Stack Overflow and got a very nice answer from Ned Deily (here). He explains clearly what the different "executables" are about, and reminds me of a tool I'd overlooked: otool. For example


> otool -L /System/Library/Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/MacOS/Python
/System/Library/Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/MacOS/Python:
/System/Library/Frameworks/Python.framework/Versions/2.6/Python (compatibility version 2.6.0, current version 2.6.1)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0)


Although it is not so helpful here:


> otool -L /System/Library/Frameworks/Python.framework/Versions/2.6/bin/python
/System/Library/Frameworks/Python.framework/Versions/2.6/bin/python:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0)


I still think the export DYLD_PRINT_LIBRARIES=1 trick is pretty cool.

You can also look into nm (like here).

I found MachOView.app at Source Forge (here) and tried it. It gave me quite a bit of insight into the structure of our simple examples from the other day (here). The screenshot above is from a run on its own executable. There is very detailed info on the object code (or images in geek-speak).

I had been a bit worried about it since I can't find out anything about the guy (Peter Saghelyi). But I found the source, which is not under files. Do:


svn co https://machoview.svn.sourceforge.net/svnroot/machoview machoview

2 comments:

Peter said...

Hi there,

I am the author of MachOView. If you have any question just mail me:
psaghelyi@hotmail.com

regards,
Peter

telliott99 said...

Thanks for checking in!