"GLIBCXX_3.4.22 not found" when used from ipykernel

[tkf]

In case you get an error like this

OSError: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by /PATH/TO/julia-1.0.2/bin/../lib/julia/libLLVM-6.0.so)

when using PyJulia via Jupyter (ipykernel), you can workaround the issue by using the LD_PRELOAD trick. For example, edit your ~/.local/share/jupyter/kernels/*/kernel.json like this:

--- a/kernel.json
+++ b/kernel.json
@@ -1,7 +1,5 @@
 {
  "argv": [
+  "env",
+  "LD_PRELOAD=/PATH/TO/julia-1.0.2/lib/julia/libstdc++.so.6",
   "/usr/bin/python",
   "-m",
   "ipykernel_launcher",

Maybe it's better to have a helper command for executing a subprocess with appropriate LD_PRELOAD (or LD_LIBRARY_PATH)?

[tkf]

Once LibJulia low-level C API #199 is implemented, we can make sure to dlopen libjulia.so without initializing PyJulia (Julia runtime + PyCall). This would be relatively quick to execute. We can then have a CLI entry point (say) julia.python_with_libjulia so that ipykernel can be used via python -m julia.python_with_libjulia -m ipykernel_launcher ....