ImportError - undefined symbol - laszip_read_point

[Aljoscha Rheinwalt]

when building with cmake the build seems fine, but when importing the resulting module I get the mentioned import error:

mkdir build
cd build
cmake ..
-- The C compiler identification is GNU 11.1.0
-- The CXX compiler identification is GNU 11.1.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonInterp: /usr/bin/python3.10 (found version "3.10.2")
-- Found PythonLibs: /usr/lib/libpython3.10.so
-- Performing Test HAS_FLTO
-- Performing Test HAS_FLTO - Success
-- Found pybind11: /usr/include (found version "2.9.0")
-- Configuring done
-- Generating done
-- Build files have been written to: /home/.../laszip-python/build
make
[ 25%] Building CXX object CMakeFiles/laszip.dir/src/laszip.cpp.o
[ 50%] Building CXX object CMakeFiles/laszip.dir/src/lasunzipper.cpp.o
[ 75%] Building CXX object CMakeFiles/laszip.dir/src/laszipper.cpp.o
[100%] Linking CXX shared module laszip.cpython-310-x86_64-linux-gnu.so
[100%] Built target laszip

and then from within python:
import laszip
ImportError: /home/.../laszip-python/build/laszip.cpython-310-x86_64-linux-gnu.so: undefined symbol: laszip_read_point

[tmontaigu]

What's your OS, how did you install laszip ?

[Aljoscha Rheinwalt]

Arch Linux and I have 3 packages installed that might be of interest:

community/laszip2 2.2.0-1 (50.0 KiB 171.3 KiB) (Installed)
ASPRS LAS lossless compression library — version 2
community/laszip 3.4.3-1 (128.5 KiB 496.7 KiB) (Installed)
ASPRS LAS lossless compression library
aur/lastools-git r653.20e9673-1 (+2 0.00) (Installed: r1251.e6b536d-1)
Efficient tools for LiDAR processing. Contains LASlib, a C++ programming API for reading / writing LIDAR data stored in standard LAS format.

Are we looking for laslib/lasreadpoint.hpp ? That would be in /usr/include

[tmontaigu]

I tried to compile on manjaro an I had no problem importing the python module after building.

The library needed for this module is community/laszip 3.4.3-1.
The header needed is laszip/laszip_api.h.

But your error is about missing symbol so, it may not be linked to the proper .so or not loading the proper .so.

The aur/lastools-git r653.20e9673-1 (+2 0.00) (Installed: r1251.e6b536d-1) seems old (2017) and when I tried it actually messed up everything when trying to compile.

You should try to just pip install laszip it may be easier

[tmontaigu]

I don't know when you installed aur/lastools-git but I think that is interferring as it may provide a liblaszip.so that is not the same as the liblaszip.so provided by community/laszip 3.4.3-1. So I would suggest maybe removing aur/lastools-git (unless you actually need it) and reinstalling community/laszip 3.4.3-1

[Aljoscha Rheinwalt]

I don't know when you installed aur/lastools-git but I think that is interferring as it may provide a liblaszip.so that is not the same as the liblaszip.so provided by community/laszip 3.4.3-1. So I would suggest maybe removing aur/lastools-git (unless you actually need it) and reinstalling community/laszip 3.4.3-1

Yes, I moved the lastools binaries to my local path and removed that package. That did the trick, did not even reinstall laszip. Btw laszip2 is not in conflict.

Thanks!