I have recently introduced checking all our *.so files on Linux in the comprehensive test script using "ldd -r". Those results immediately reminded me we had not yet done anything about setting rpath in both the build tree and possibly (if USE_RPATH is ON) install tree for dllplplot_stubs.so, the shared object generated by our build system for the OCaml binding.
So to experiment with methods of fixing this I tried all the different ways that are documented for the ocamlmklib command (i.e., -dllpath <dir> -R<dir> -Wl,-rpath,<dir> -Wl,-rpath -Wl,<dir> -Wl,-R<dir> to set rpath, and the good news is all those methods gave consistent results, but the bad news is those consistent results did not (!) set rpath at all as shown by objdump -x dllplplot_stubs.so |grep -i rpath and ldd -r and even diffs between results with and without one of the above options being set. This complete lack of rpath results was generated by ocamlmklib, version 4.01.0 on Debian Jessie. Three years ago, Orion was the victim on Fedora of a cutting-edge ocamlmklib bug where rpath was being set to nonsensical values for dllplplot_stubs.so when none of the above options were being set. That is a different issue which I assume the ocaml developers have fixed now, although from the above results it is possible their fix was to deliberately disable setting rpath. I don't feel exactly comfortable with changing our build system without some way of testing the result locally. Furthermore, there is also the possibility that the ocaml developers deliberately disabled setting rpath. Finally, the above linking issue for dllplplot_stubs.so doesn't seem to affect our current OCaml tests any. So my decision for now is I will not change our build system in anticipation that one of the above rpath setting methods _might_ work some day. But if someone finds a system where one of the above methods work, please let me know, and I might reconsider. Note this current deficiency of our current build system should not show up in any lintian reports for packagers like Andrew and Orion since they set USE_RPATH to OFF (i.e., they prefer no rpath set in the install tree for dllplplot_stubs.so which is the case now regardless of USE_RPATH value). Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/xeonphi _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
