some strange/artificial namespaces in PyROOT

[VanyaBelyaev]

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Description

In my C++&PyROOT-basic project I have rather colicated structure of (C++) namespaces and classes
e.g. Ostap::Math , Ostap::Models , Ostap::Utils , Ostap::Kinematics , Ostap::StatVar, Ostap::GSL etc

Recently (from ROT 6.38?) I've observed very strange behaviour. PyROOT generates some symbols
in namespace Ostap with strange names with the last symbol truncated:

Out[9]: 
[ ... 

 'GS',
 'GSL',

 'Kinematic',
 'Kinematics',

 'Mat',
 'Math',

 'Model',
 'Models',

 'MoreRooFi',
 'MoreRooFit',

 'StatVa',
 'StatVar',

 'Util',
 'Utils',
  ... ] 

Now all symbols get such "truncated" twin.

And here I have some problem

• for my working platform (Linux) such truncated symbols causes no problems (or, at elast I do not see th problem yet)
• unfortunately for osx_64 and osx_arm64 there is failure to load the dictionary:

│ │ AttributeError: <namespace cppyy.gbl.Ostap.Utils at 0x127f60f20> has no attribute 'ErrorSentry'. Full details:
 │ │   type object 'Utils' has no attribute 'ErrorSentry'
 │ │   'Ostap::Utils::ErrorSentry' is not a known C++ class
 │ │   'ErrorSentry' is not a known C++ template
 │ │   'ErrorSentry' is not a known C++ enum

However I do not know if these are really connected issues. but it looks like that for osx-platform these "fake" symbold hide the correct symbols. and it happens for 6.38 <= ROOT, for ROOT 6.36 there are no problems. Unfortunately I cannot dive deep into osx-issues since I have no direct access to this platform and I can see the problem only via conda feedstock

• My project is rather heavy, I've tried to prepare simple reproducer but I've got no success.

In very old ROOT-forum post from 2019 https://root-forum.cern.ch/t/cppyy-gbl-and-root-namespace/34396 I've seen such lines, that may have some connection to the issue:

and some of them look very strange (e.g., ‘Detai’, ‘Experimenta’, ‘Fi’, ‘Mat’ … ).

But thit item was only mentioned and not discussed in the post at all..

As I've said, I see no negative impact for Linux platform - the only negative impact is for osx platform for ROOT >= 6.38 - in particular it stops the builds of my project at conda.

Reproducer

I am very sorry but I've got so success to provide the simple reproducer

ROOT version

• Linux: ROOT 6.39 from cmvfs dev3 lnightly LCG build
• osx_64 & osx_arm64: ROOT 6.36 & 6.38 from conda

Installation method

LCG cvmfs build, in particular dev3 nightly slot

Operating system

Linux, lxplus

Additional context

Let me stress

• strange/truncated symbols I see both for Linux and OSX (both for ROOT 6.36 & 6.38 )
• for OSX (ROOT >=6.38) also see the failure in loading the dictionary whyle for ROOT=6.36 there is no failure. I do not have any strniog arguments that OSX problem is related to existence of truncated symbols, but the correnction is definitely not excluded.

anyhow the apearence of such "extra" symbols are very confusing and likely related to some problems.

[guitargeek]

Hi, thanks for the report! This rings a bell, I think I looked into something like this years ago...

I am very sorry but I've got so success to provide the simple reproducer

That's okay. What about a complicated reproducer? I don't mind building and running the ostap tests if you just tell me how 🙂

[VanyaBelyaev]

Hi Jonas @guitargeek

to build the project you may try this: source ./build_me

where build_meis

#!/usr/bin/env bash

rm -rf test_ostap
mkdir  test_ostap
cd     test_ostap

git clone  https://github.com/OstapHEP/ostap.git ostap

ls -al 
cd ostap 
OSTAP_SOURCE=$PWD 

mkdir build 
cd    build 

## (1) build temporary directory  
## (2) use LCG_109 with clang-19
## (3) default is LCG=dev3/latest with clang19 
OSTAP_BUILD=tmp source ../.aux/.build-lcg LCG_109 x86_64-el9-clang19-opt

It will build ostap in temproary directory against LCG_109 + clang19

And then execute any file or test from ostap, e.g.

python $OSTAP_INSTALL/ostap/core/core.py

At the end it prints:

# ostap.core.core                     INFO      ********************************************************************************
# ostap.core.core                     INFO      ********************************************************************************
# ostap.core.core_base                WARNING   Strange/truncated symbols in namespace Ostap: #9
# ostap.core.core_base                WARNING   [see https://github.com/root-project/root/issues/21536]
# ostap.core.core_base                WARNING   0/9  Function
# ostap.core.core_base                WARNING   1/9  GS
# ostap.core.core_base                WARNING   2/9  Kinematic
# ostap.core.core_base                WARNING   3/9  Mat
# ostap.core.core_base                WARNING   4/9  Model
# ostap.core.core_base                WARNING   5/9  MoreRooFi
# ostap.core.core_base                WARNING   6/9  QuantileType
# ostap.core.core_base                WARNING   7/9  Tree
# ostap.core.core_base                WARNING   8/9  Util