ROOT Version: 6.32.02
Platform: Ubuntu 24.04
Compiler: c++ v13.2.0
Hi,
I just built the ROOT with Python 3.12.4 from conda environment. It built fine and running, other than the PyROOT. As in the following terminal output, I am getting a RuntimeError: could not load cppyy_backend library.
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ source root_install/bin/thisroot.sh
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ root -q
------------------------------------------------------------------
| Welcome to ROOT 6.32.02 https://root.cern |
| (c) 1995-2024, The ROOT Team; conception: R. Brun, F. Rademakers |
| Built for linuxx8664gcc on Jul 06 2024, 13:44:56 |
| From heads/master@tags/v6-32-02 |
| With c++ (Ubuntu 13.2.0-23ubuntu4) 13.2.0 |
| Try '.help'/'.?', '.demo', '.license', '.credits', '.quit'/'.q' |
------------------------------------------------------------------
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ which python
/home/saumyen/HEP_Packages/miniconda3/bin/python
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ python -V
Python 3.12.4
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ python
Python 3.12.4 | packaged by Anaconda, Inc. | (main, Jun 18 2024, 15:12:24) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> import ROOT
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/saumyen/HEP_Packages/root_install/lib/ROOT/__init__.py", line 25, in <module>
import cppyy
File "/home/saumyen/HEP_Packages/root_install/lib/cppyy/__init__.py", line 81, in <module>
from ._cpython_cppyy import *
File "/home/saumyen/HEP_Packages/root_install/lib/cppyy/_cpython_cppyy.py", line 21, in <module>
c = loader.load_cpp_backend()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/saumyen/HEP_Packages/root_install/lib/cppyy_backend/loader.py", line 79, in load_cpp_backend
raise RuntimeError("could not load cppyy_backend library")
RuntimeError: could not load cppyy_backend library
>>>
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages$ cd root_install/
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages/root_install$ find -name 'libcppyy_backend*'
./lib/libcppyy_backend.so
(base) saumyen@saumyen-ThinkPad-E14-Gen-6:~/HEP_Packages/root_install$
Earlier, in Ubuntu 22.04.4 with c++ 11.4..0 and Python 3.10.12 from /usr/bin/python3.10 worked fine. Do you think the error is related to the Python version? The root --notebook command is also working. In the CMakeCache.txt I found these lines:
//Compiler reason failure
_Python3_Compiler_REASON_FAILURE:INTERNAL=
_Python3_DEVELOPMENT_EMBED_SIGNATURE:INTERNAL=7d39fa85bb138c83e9241639e4c23303
_Python3_DEVELOPMENT_MODULE_SIGNATURE:INTERNAL=12744826e38390a6903a1689ff0fe372
//Development reason failure
_Python3_Development_REASON_FAILURE:INTERNAL=
_Python3_EXECUTABLE:INTERNAL=/home/saumyen/HEP_Packages/miniconda3/bin/python3
//Path to a file.
_Python3_INCLUDE_DIR:INTERNAL=/home/saumyen/HEP_Packages/miniconda3/include/python3.12
//Python3 Properties
_Python3_INTERPRETER_PROPERTIES:INTERNAL=Python;3;12;4;64;;cpython-312-x86_64-linux-gnu;abi3;/home/saumyen/HEP_Packages/miniconda3/lib/python3.12;/home/saumyen/HEP_Packages/miniconda3/lib/python3.12;/home/saumyen/HEP_Packages/miniconda3/lib/python3.12/site-packages;/home/saumyen/HEP_Packages/miniconda3/lib/python3.12/site-packages
_Python3_INTERPRETER_SIGNATURE:INTERNAL=3d11cb787c0b3087f27520e3dc647fc4
//Interpreter reason failure
_Python3_Interpreter_REASON_FAILURE:INTERNAL=
//Path to a library.
_Python3_LIBRARY_RELEASE:INTERNAL=/home/saumyen/HEP_Packages/miniconda3/lib/libpython3.12.so
_Python3_NUMPY_SIGNATURE:INTERNAL=0f642a18a2ef2bf1386b75880aeead08
//Path to a file.
_Python3_NumPy_INCLUDE_DIR:INTERNAL=/home/saumyen/HEP_Packages/miniconda3/lib/python3.12/site-packages/numpy/core/include
//NumPy reason failure
_Python3_NumPy_REASON_FAILURE:INTERNAL=
__pkg_config_arguments_PKG_FONTCONFIG:INTERNAL=QUIET;fontconfig
__pkg_config_arguments__OPENSSL:INTERNAL=QUIET;openssl
__pkg_config_checked_DAVIX:INTERNAL=1
__pkg_config_checked_PC_LIBEDIT:INTERNAL=1
__pkg_config_checked_PC_LIBXML:INTERNAL=1
__pkg_config_checked_PC_SQLITE:INTERNAL=1
__pkg_config_checked_PKG_FONTCONFIG:INTERNAL=1
__pkg_config_checked__OPENSSL:INTERNAL=1
I will appreciate any possible help in this regard.
Regards,
Saumyen