Symbol clash -- Root 5.32 and Geant4 9.5

I am trying to build a program (G4beamline) with the latest versions of both Root and Geant4. Unfortunately there is a symbol clash, and I'm looking for advice. The problem seems to be more with Root than Geant4, but I don't know that for sure. Note I build from source, do "make static", and use libRoot.a, not the shared objects. For now I am working on Mac OS X 10.5.8 (Leopard), which is a 64-bit OS but a 32-bit compiler; eventually I'll need to build on 32- and 64-bit Mac, Linux, and Windows.

Root 5.32 has an option "--minimal" that looks like what I need, because the only Root classes used directly are TFile, TDirectory, and TNtuple. I found that Root determines 32-bit vs 64-bit architecture based on the OS, not the compiler; as I am compiling with other code I need to specify the architecture of the compiler. I then found that the obvious configuration did not build because of missing symbols:

     ./configure macosx --minimal
I enabled builtin-s until Root built by itself:

     ./configure macosx --minimal --enable-builtin-lzma --enable-builtin-zlib

Then I tried building G4beamline, with Geant4 9.5 and Root 5.32. I got this error:

     Linking g4beamline
     ld: duplicate symbol _zlibVersion in .../libRoot.a(zutil.o) and
         .../libG4zlib.a(zutil.cc.o)
     collect2: ld returned 1 exit status

Then I tried the obvious way to resolve the conflict (after completely removing Root so it gets re-configured and re-built):

     ./configure macosx --minimal --enable-builtin-lzma --disable-builtin-zlib and got this error:

     Linking g4beamline
     Undefined symbols:
       "_inflate", referenced from:


           _R__unzip in libRoot.a(ZInflate.o)

       "_inflateEnd", referenced from:


           _R__unzip in libRoot.a(ZInflate.o)

           _R__unzip in libRoot.a(ZInflate.o)

       "_inflateInit_", referenced from:


           _R__unzip in libRoot.a(ZInflate.o)

     ld: symbol(s) not found
     collect2: ld returned 1 exit status

Part of the problem is that neither codes has a class name or namespace to differentiate the two implementations of zlib. I don't care about 2 implementations, as long as they co-exist peacefully (the Geant4 and Root code never interact directly with each other).

Suggestions?

	[If there is only one symbol in conflict, one option is to just
	 edit one source to change its name. But I suspect there are
	 lots of conflicting names and link only displayed the first one.
	 I already have a handful of edits to Geant4 that must be re-done
	 for each new version.]

	[Another option is to revert to using shared objects. This has thorns
	 on systems with other installations of Root. It is also a pain when
	 distributing a binary release (which I need to do). And some
	 supercomputers do not support shared objects on worker nodes.]

	[These two zutil.cc are obviously derived from the same initial
	 implementation, a third option is for me to put the union of
	 them into my source. As I don't think my code actually uses
	 any of this, perhaps making them just call abort().]

Tom Roberts Received on Sat Jan 21 2012 - 07:07:33 CET