segmentation fault when instantiating Proj4Error

[pmav99]

Description

There is a segmentation fault when an instance of Proj4Error is created.

This issue is related to landscapeio/prospector#403

Code to reproduce

from cartopy._crs import Proj4Error
print("import OK")
Proj4Error()

Traceback

import OK
[2]    223292 segmentation fault (core dumped)  python foo.py

Full environment definition

Operating system

uname -a
Linux laptopi 5.10.6-arch1-1 #1 SMP PREEMPT Sat, 09 Jan 2021 18:22:35 +0000 x86_64 GNU/Linux

Cartopy version

0.18.0

pip list

Cartopy==0.18.0
numpy @ file:///home/feanor/.cache/pypoetry/artifacts/43/62/9c/57636b66454eb8457b38bdb776593ce5ba63ffdb0e3f5554866d143d20/numpy-1.19.5-cp38-cp38-manylinux2010_x86_64.whl
pyshp==2.1.3
Shapely @ file:///home/feanor/.cache/pypoetry/artifacts/f9/a4/1e/118ef161927c9ad03fbb661c3131578e045201a5c23f89a515822d12d1/Shapely-1.7.1-cp38-cp38-manylinux1_x86_64.whl
six @ file:///home/feanor/.cache/pypoetry/artifacts/be/98/c7/69fe6fea7a59659af1c6260899226129565330b1e07c9c5b3769be76bf/six-1.15.0-py2.py3-none-any.whl

[ocefpaf]

@pmav99 did you install it with conda or from other source?

(I can confirm that this happens with conda-forge's cartopy with both projs 5, 6 and 7.)

[pmav99]

No I am using the packages from PyPi

On My laptop I am using proj6

local/proj 6.3.2-1
    Cartographic Projections library