Building on Alpine Linux - Boost::Python and Eigen3 not found

[jchidley]

I am trying to run nextpnr on Alpine Linux. I believe that I have the right packages installed but I am left with the following errors when I run cmake -DARCH=ice40 .:

CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:2003 (message):
  No header defined for python-py382; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:157 (find_package)

CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:2003 (message):
  No header defined for python-py38; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:164 (find_package)

CMake Warning at /usr/share/cmake/Modules/FindBoost.cmake:2003 (message):
  No header defined for python-py3; skipping header check
Call Stack (most recent call first):
  CMakeLists.txt:164 (find_package)

CMake Error at CMakeLists.txt:199 (find_package):
  Could not find a package configuration file provided by "Eigen3" with any
  of the following names:

    Eigen3Config.cmake
    eigen3-config.cmake

  Add the installation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set
  "Eigen3_DIR" to a directory containing one of the above files.  If "Eigen3"
  provides a separate development package or SDK, be sure it has been
  installed.

-- Configuring incomplete, errors occurred!
See also "/home/jack/nextpnr/CMakeFiles/CMakeOutput.log".

From looking at CMakeLists.txt I believe that my problems are caused because Alpine Linux is different from the 'supported' distributions. See below for the relevant lines (149-194) for boost::python:

if (BUILD_PYTHON)
    # Find Boost::Python of a suitable version in a cross-platform way
    # Some distributions (Arch) call it libboost_python3, others such as Ubuntu
    # call it libboost_python35. In the latter case we must consider all minor versions
    # Original source: https://github.com/BVLC/caffe/blob/master/cmake/Dependencies.cmake#L148
    set(version ${PYTHONLIBS_VERSION_STRING})

    STRING(REGEX REPLACE "[^0-9]" "" boost_py_version "${version}")
    find_package(Boost QUIET COMPONENTS "python-py${boost_py_version}" ${boost_libs})
    set(Boost_PYTHON_FOUND ${Boost_PYTHON-PY${boost_py_version}_FOUND})

    while (NOT "${version}" STREQUAL "" AND NOT Boost_PYTHON_FOUND)
        STRING(REGEX REPLACE "([0-9.]+).[0-9]+" "\\1" version "${version}")

        STRING(REGEX REPLACE "[^0-9]" "" boost_py_version "${version}")
        find_package(Boost QUIET COMPONENTS "python-py${boost_py_version}" ${boost_libs})
        set(Boost_PYTHON_FOUND ${Boost_PYTHON-PY${boost_py_version}_FOUND})

        STRING(REGEX MATCHALL "([0-9.]+).[0-9]+" has_more_version "${version}")
        if ("${has_more_version}" STREQUAL "")
            break()
        endif ()
    endwhile ()

    if (NOT Boost_PYTHON_FOUND)
        foreach (PyVer 3 36 37 38 39)
            find_package(Boost QUIET COMPONENTS python${PyVer} ${boost_libs})
            if ("${Boost_LIBRARIES}" MATCHES ".*(python|PYTHON).*" )
                set(Boost_PYTHON_FOUND TRUE)
                break()
            endif ()
        endforeach ()
    endif ()

    if (NOT Boost_PYTHON_FOUND)
        STRING(REGEX REPLACE "([0-9]+\\.[0-9]+).*" "\\1" gentoo_version "${PYTHONLIBS_VERSION_STRING}")
        find_package(Boost QUIET COMPONENTS python-${gentoo_version} ${boost_libs})
        if ("${Boost_LIBRARIES}" MATCHES ".*(python|PYTHON).*" )
            set(Boost_PYTHON_FOUND TRUE)
        endif ()
    endif ()

    if (NOT Boost_PYTHON_FOUND )
        message( FATAL_ERROR "No version of Boost::Python 3.x could be found.")
    endif ()
endif()                                  

I haven't checked Eigen3 but I assume that it will be the same problem. I am continuing to investigate the issue and see if I can find a fix.

[marzoul]

Hi, I have the same issue with Archlinux to compile the package from source: https://aur.archlinux.org/packages/nextpnr-git I narrowed down the issue to the following line of CMakeLists.txt: find_package(PythonLibs 3.5 REQUIRED) When I call cmake with additional option: -DPYTHON_INCLUDE_DIRS=/usr/include/python3.8 I can observe that, before the call to find_package(PythonLibs 3.5 REQUIRED), I have: PYTHON_INCLUDE_DIRS=/usr/include/python3.8 and after the call I have: PYTHON_INCLUDE_DIRS=/usr/include/python3.7m This is a wrong result. I don't know where this comes from, but at least I can manually patch the CMakeLists.txt to override PYTHON_INCLUDE_DIRS and compile successfullly. EDIT Also need to override PYTHON_LIBRARIES for link: PYTHON_LIBRARIES=/usr/lib/libpython3.8.so So it seems it's just an issue of find_package getting a wrong version from somewhere.

[jchidley]

I did this yesterday on Arch Linux. It is tricky. You need the all of the following AUR packages: https://aur.archlinux.org/packages/icestorm-git/ https://aur.archlinux.org/packages/trellis-git/ https://aur.archlinux.org/packages/nextpnr-git/ https://aur.archlinux.org/packages/yosys-git/

For some reason not all the prerequisites install correctly (or perhaps they always need to be installed explicitly?) so you might want to check that. Ensure that every one is up-to-date by doing a git pull in each.

[natevw]

I hit this too, it seems to be related to https://gitlab.alpinelinux.org/alpine/aports/-/issues/11233 — which I don't understand the status of. It seemed the consensus was:

Yes, please put [the files not found] on usr/lib/cmake [instead of usr/share/cmake]

and the issue was closed a year ago, but looking at the alpine v3.14 package (as well as the edge package) everything is still in "/usr/share/cmake/" instead.

I was able to workaround via:

cd nextpnr; Eigen3_DIR=/usr/share/cmake/Modules cmake -DARCH=ice40 -DCMAKE_INSTALL_PREFIX=/usr/local . && make -j$(nproc) && make install

i.e. specifically I added Eigen3_DIR=/usr/share/cmake/Modules environment variable ahead of the cmake call so it can find it in the wrong location. [Still having problems building on alpine but I'll file a separate issue for that.]