Cgnslib.h not found

General
1

Hi,
When I want to install cgns, I get an error which says cgnslib.h is not found. I think that should be fetched by pip since I am installing cgns. Isn’t that?

$ python3.6 -m pip install cgns

Collecting cgns
Using cached CGNS-2009.10.30.tar.gz
Building wheels for collected packages: cgns
Running setup.py bdist_wheel for cgns ... error
Complete output from command /usr/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-_28r5tm7/cgns/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmp4vfl_nbopip-wheel- --python-tag cp36:
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.6
creating build/lib.linux-x86_64-3.6/CGNS
copying src/CGNS.py -> build/lib.linux-x86_64-3.6/CGNS
copying src/__init__.py -> build/lib.linux-x86_64-3.6/CGNS
running build_ext
building '_CGNS' extension
swigging src/cgnslib.i to src/cgnslib_wrap.c
swig -python -I/usr/include -o src/cgnslib_wrap.c src/cgnslib.i
src/cgnslib.i:38: Error: Unable to find 'cgnslib.h'
error: command 'swig' failed with exit status 1
2

Hi Mahmood,

Sorry, I have posted my reply to the wrong thread.

I would recommend to build and install from the source using cmake:
http://cgns.sourceforge.net/download.html

Then, export LD_LIBRARY_PATH=the path to libcgns.so.

It is also important to appropriately link HDF5 library in libcgns.so, which is discussed in the following thread:
https://groups.google.com/d/msg/pyfrmailinglist/qp5r3nlsONQ/4YzHuyGwEQAJ

Regarding the setup.py issue, adding “install” should work:
$ python3 setup.py install

Best regards,
Yoshiaki

3

It is also important to appropriately link HDF5 library in libcgns.so, which is discussed in the following thread:
https://groups.google.com/d/msg/pyfrmailinglist/qp5r3nlsONQ/4YzHuyGwEQAJ

After all, is it mandatory to install cgns?

Regards,
Mahmood

4

It is not mandatory to install cgns if you can use gmsh (.msh) format.

Regards,
Yoshiaki

5

In future versions of PyFR it is planned that the CGNS importer will no longer be supported