patching_so_files.md

Where does this come from?

The contents of this repo come entirely from: http://www.isdc.unige.ch/~lyard/repo/

Modifications with respect to http://www.isdc.unige.ch/~lyard/repo/

1. setup.py:

   I just updated the setup.py a little to use setuptools instead of distutils. The result is that all *.py and *.so files of this package are installed into a folder called "protozfitsreader" inside the "site-packages", before the files were directly copied into "site-packages" which worked as well, but was a little untidy.

2. relative imports

   As a result, I had to modify some import statement, they were written as absolute imports, but now we do relative imports from the "protozfitsreader" package.

3. set RPATH

   The main purpose of this was, to deliver "patched" so-files. The so-files in the original tar-ball contain absolute RPATHs, which prevent the linker from finding the dependencies. Here I simply patched the so-files and added relative RPATH like this:

   for i in *.so; do patchelf --set-rpath '$ORIGIN' $i; done
   for i in raw*.so; do patchelf --set-rpath '$ORIGIN:$ORIGIN/../../../' $i; done
   for i in *.so; do echo $i; patchelf --print-rpath $i; done
   

   gives:

   libACTLCore.so
   $ORIGIN
   libZFitsIO.so
   $ORIGIN
   rawzfitsreader.cpython-35m-x86_64-linux-gnu.so
   $ORIGIN:$ORIGIN/../../../
   rawzfitsreader.cpython-36m-x86_64-linux-gnu.so
   $ORIGIN:$ORIGIN/../../../