Warning in <TClassTable::Add>

[Lucio_physics]

Hi everyone, I hope this is the right category for this topic.
I’ve recently installed ROOT v6.16/00 on Ubuntu v18.04, running on my Windows 10 WSL with Xming; I got ROOT by downloading the binary, not by building it.
I added the script “thisroot.sh” to my “.profile” file.
Everything works fine, ROOT is executed without errors from any directory and I can run my macros on it.
The problem occours when I try to include ROOT as C++ class: I can compile my program (g++), but when I run it I get a list of warnings which I report here; please note that the program still works fine after the list of warnings.
Any suggestion would be appreciated, thank you!

list:

Warning in TClassTable::Add: class TFileMerger already in TClassTable
Warning in TClassTable::Add: class TDirectoryFile already in TClassTable
Warning in TClassTable::Add: class TFile already in TClassTable
Warning in TClassTable::Add: class TMemFile already in TClassTable
Warning in TClassTable::Add: class ROOT::Experimental::TBufferMerger already in TClassTable
Warning in TClassTable::Add: class ROOT::Experimental::TBufferMergerFile already in TClassTable
Warning in TClassTable::Add: class TArchiveFile already in TClassTable
Warning in TClassTable::Add: class TArchiveMember already in TClassTable
Warning in TClassTable::Add: class TBufferIO already in TClassTable
Warning in TClassTable::Add: class TBufferFile already in TClassTable
Warning in TClassTable::Add: class TBufferText already in TClassTable
Warning in TClassTable::Add: class TBufferJSON already in TClassTable
Warning in TClassTable::Add: class TGenCollectionProxy already in TClassTable
Warning in TClassTable::Add: class TGenCollectionProxy::Value already in TClassTable
Warning in TClassTable::Add: class TGenCollectionProxy::Method already in TClassTable
Warning in TClassTable::Add: class TCollectionProxyFactory already in TClassTable
Warning in TClassTable::Add: class TCollectionStreamer already in TClassTable
Warning in TClassTable::Add: class TCollectionClassStreamer already in TClassTable
Warning in TClassTable::Add: class TCollectionMemberStreamer already in TClassTable
Warning in TClassTable::Add: class TEmulatedCollectionProxy already in TClassTable
Warning in TClassTable::Add: class TEmulatedMapProxy already in TClassTable
Warning in TClassTable::Add: class TFileCacheRead already in TClassTable
Warning in TClassTable::Add: class TFree already in TClassTable
Warning in TClassTable::Add: class TFileCacheWrite already in TClassTable
Warning in TClassTable::Add: class TFPBlock already in TClassTable
Warning in TClassTable::Add: class TFilePrefetch already in TClassTable
Warning in TClassTable::Add: class TKey already in TClassTable
Warning in TClassTable::Add: class TKeyMapFile already in TClassTable
Warning in TClassTable::Add: class TLockFile already in TClassTable
Warning in TClassTable::Add: class TMapFile already in TClassTable
Warning in TClassTable::Add: class TMapRec already in TClassTable
Warning in TClassTable::Add: class TStreamerInfo already in TClassTable
Warning in TClassTable::Add: class TVirtualArray already in TClassTable
Warning in TClassTable::Add: class TStreamerInfoActions::TConfiguration already in TClassTable
Warning in TClassTable::Add: class TStreamerInfoActions::TConfiguredAction already in TClassTable
Warning in TClassTable::Add: class TStreamerInfoActions::TActionSequence already in TClassTable
Warning in TClassTable::Add: class TVirtualObject already in TClassTable
Warning in TClassTable::Add: class TZIPFile already in TClassTable
Warning in TClassTable::Add: class TZIPMember already in TClassTable
Error in TExMap::Add: key 140473639202320 is not unique

Note: TClassTable was always between “<>” brakets, I had to remove them because I couldn’t post a topic with more than two links.

---

_ROOT Version: 6.16/00
_Platform: Ubuntu 18.04 on Windows 10 WSL
___Preformatted text

[Danilo]

Hi Lucio,

what do you mean by include ROOT as C++ class?
Cheers,
D

[Lucio_physics]

Hi, thank you for the reply!
I ment I use ROOT’s classes in C++ programs, sorry for the bad explenation.
I include ROOT inside C++ programs to plot graphs and fit functions; in the C++ source I include ROOT’s classes, for istance:

#include "TGraphErrors.h"
#include "TF1.h"

When I compile the source I don’t get any error, but when I run the program the warnings appear; nevertheless, the program works and I get the plot fitted as I’d expect!

[Danilo]

Hi Lucio,

I am not surprised ROOT works but I am surprised by the warnings: they are not expected. We do not see it in any of our platforms. Did the installation process go smoothly without hacks/errors?
I invited to the thread our windows expert.

Cheers,
D

[bellenot]

Well, it’s not Windows, it’s Ubuntu running on Windows… But that would be interesting to know how you compile your program

[Lucio_physics]

Hi, thank you both for your time!
The installation went pretty smooth: I downloaded and unzipped ROOT, then I added “thisroot.sh” script to my .profile file; I had to add ROOT to my windows PATH, otherwise Ubuntu (on wsl) couldn’t find it.

To compile my sources I use the following line:

g++ sourcename.cpp -o executablename `root-config --cflags --glibs`

Thank you!

[bellenot]

Thanks. So I have no idea, I only use ROOT on Windows (native) and have no experience with WSL, but I suppose it should work the same than on standard Ubuntu. You could try to build ROOT from source, but it might be an overkill…

[Lucio_physics]

Thank you anyway, I tried to install it once again but I get the same warnings; when I have time I’ll try to build it from source and I report any changes!

[pcanal]

Note that this kind of message usually happen when (for whatever reason) the same library is being loaded twice.

[Lucio_physics]

Thank you for the hint!
I tried to gather some infos that might be useful.
I noticed that I need the line:

export LD_LIBRARY_PATH="/mnt/d/root/lib":$LD_LIBRARY_PATH

in addition to

. /pathtothisroot/thisroot.sh

in my .profile file, otherwise I can’t compile the source (I get a list of “undefined reference to” that I can post here if it’s of any interest).

If I remove “thisroot” script from my .profile everything works but I still get the warnings.

If I type (on ubuntu bash):

echo $LD_LIBRARY_PATH

the result is only the path to root’s library.

I hope this might help, thank you!

[Lucio_physics]

UPDATE:
I built ROOT from source and now it works fine!