Arch Linux

Description:

The tensorflow C API library (libtensorflow.so) cannot be loaded because
the dependency libiomp5.so cannot be found.

This is also the case for the -opt and -cuda variants; besides, the same
issue occurs with the C++ library (libtensorflow_cc.so).

This issue does not apply to the python packages (like python-tensorflow),
because a version of libiomp5.so is included, currently at:
/usr/lib/python3.10/site-packages/_solib_k8/_U_S_Sthird_Uparty_Smkl_Cmkl_Ulibs_Ulinux___Uexternal_Sllvm_Uopenmp/libiomp5.so

----

Possible solutions:

1 - Include libiomp5.so (and whatever deps it needs?) as part of the TF
packages (similar to what is done on the python TF ones).

It could be installed into /usr/lib or somewhere else, if that's too inconvenient.

Note that one version of libiomp5.so can be found somewhere inside
the bazel build tree, so that one could be installed.

2 - Add a dependency of TF on intel-oneapi-openmp (which provides libiomp5.so)
and intel-oneapi-openmp (which provides a source-able vars.sh to allow
loading the .so library)

----

Steps to reproduce:

[In python REPL]

>>> from ctypes import CDLL
>>> lib = CDLL('/usr/lib/libtensorflow.so')

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.10/ctypes/__init__.py", line 374, in __init__
self._handle = _dlopen(self._name, mode)
OSError: libiomp5.so: cannot open shared object file: No such file or directory