mshr build

[metallic_muffin]

I'm having troubles to correctly install mshr in Arch Linux. I've downloaded and installed the package python-mshr-git from the AUR. However, when running a Python code for FEniCS, I get the message "from mshr import * ModuleNotFoundError: No module named 'mshr' ".

After seeking help with the Arch Linux people, I've been told to report the bug here on Bitbucket with the following message: "Please update the python CMakeLists.txt so it can detect the libmshr" from the build directory, so that the python bindings can be built at the same time as mshr."

[Benjamin Dam Kehlet]

Ok strange. A mshr-config.cmake file is already generatee in the build directory that points to libmshr in the build directory, but maybe something is not working as it should. I'll take a look.

Is there a simple for you to test if it works without going through the Arch repository? (I don't know anything about Arch Linux)

[Benjamin Dam Kehlet]

Do you know how the build directory is known to the python CMakeLists.txt? (Do they eg. set MSHR_DIR?)

[metallic_muffin]

Unfortunately I don't know these details. I've been helped and could build (and install) successfully mshr. The fix was to modify the following pkgbuild: https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=python-mshr-git to that one: https://bbs.archlinux.org/viewtopic.php?id=234373 (see post #5).

Does this help to track the bug?

[Benjamin Dam Kehlet]

Thanks for the link. The PYTHON_EXECUTABLE that they mention looks suspicious. They are right that the library and the python bindings are now built independently, ie. this part now looks correct

cmake .. \
        -DCMAKE_INSTALL_PREFIX="${pkg}"/usr \
        -DPYTHON_EXECUTABLE="${py_interp}" \
        -DCMAKE_SKIP_BUILD_RPATH=TRUE \
        -DCMAKE_SKIP_RPATH=TRUE \
        -DCMAKE_BUILD_TYPE="Release"

    make
    cd ../python
    export CMAKE_MODULE_PATH="${srcdir}/mshr/build/"
    python setup.py build

but maybe it should be stated more clearly in the docs. This is also new since the swig based bindings were replaced by the pybind11 based ones.