pyROOT in Eclipse IDE on OS X

ROOT
1

Hi,

I am trying to get pyROOT (from ROOT 5.22) working form within the Eclipse IDE (3.2) on OS X (10.5.6). I have set up the interpreter and have configured the environment settings within the Eclipse project to have the following:

ROOTSYS=/Users/gcowan/software/root
PATH=$ROOTSYS/bin:$PATH
LD_LIBRARY_PATH=$ROOTSYS/lib:$LD_LIBRARY_PATH
DYLD_LIBRARY_PATH=$ROOTSYS/lib:$DYLD_LIBRARY_PATH

However, when I try to run a macro I get the error:

import ROOT
File “/Users/gcowan/software/root/lib/ROOT.py”, line 86, in
import libPyROOT as _root
ImportError: dlopen(/Users/gcowan/software/root/lib/libPyROOT.so, 2): Library not loaded: @rpath/libCore.so
Referenced from: /Users/gcowan/software/root/lib/libPyROOT.so
Reason: image not found

I’ve seen a couple of other postings on this forum about this issue, but none of them have helped me. Does anyone have any ideas?

Cheers,
Greig

2

Greig,

presumably you have set PYTHONPATH as well? Does “import ROOT” work from python from a Terminal?

Cheers,
Wim

3

Hi Wim,

In my .bashrc I have all of the relevant variables set (PATH, PYTHONPATH…) and I can import ROOT at the python prompt.

Eclipse also has it’s own PYTHONPATH and environment settings (for the system as a whole and for each project, I think) and as far as I can tell I have set them correctly. If I purposefully don’t add ROOTSYS to the Eclipse system PYTHONPATH then the error message I get is:

import ROOT

ImportError: No module named ROOT

which is what I would expect with this configuration. Comparing this with the error message that I had in my first post shows that eclipse knows enough about ROOT to start loading the module but subsequently fails.

Cheers,
Greig

4

Creig,

[sorry for asking probably more obvious stuff, but I only have an ancient little Mac at my disposal, so hard to try and reproduce the issue]

Could you run from within Eclipse a small script that prints the environment variables as seen by the python process run from Eclipse? Something like:import os print 'ldpath:', os.environ[ 'LD_LIBRARY_PATH' ] print 'dyldpath:', os.environ[ 'DYLD_LIBRARY_PATH' ]
Cheers,
Wim

5

Hi Wim,

Problem solved.

In the Eclipse python interpreter environment I had set the ROOTSYS environment variable. I had also set PATH, LD_LIBRARY_PATH, … to:

PATH=$ROOTSYS/bin:$PATH

etc

I thought that $ROOTSYS would be picked up from my definition in Eclipse. Howevr, if I instead replace $ROOTSYS with the absolute path to my ROOT installation then everything works.

Sorry for the noise!

Cheers,
Greig