Attempt to fix Surelog build: we need python development files.

[hzeller]

Fixes #105

Signed-off-by: Henner Zeller h.zeller@acm.org

[hzeller]

Let's see if this works.

[hzeller]

(not merge yet, work in progress)

[hzeller]

So, python-dev is not the right package: https://travis-ci.com/github/SymbiFlow/conda-packages/jobs/352794276#L1297

How do I get Python development files (Python.h and shared lib)?

Adding @mithro as he most likely knows all things Python related.

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[hzeller]

Anyone of you knows what the right conda package is to get Python development files ? Searching on Anaconda did not enlighten me much ...

[mithro]

@hzeller They are in the "python" package -- the issue is cmake not finding them properly.

[hzeller]

Cmake finds the Interpreter, but not the Development files.

I have seen something like that on some workstation where the python interpreter it finds is a different version than development files that might be on the system (available was 3.7 with interpreter and development, and 3.8 with only interpreter); unfortunately the cmake rule does not do an exhaustive search of versions where it has one and the other. On a workstation, I can fix that by uninstalling a stray version of Python (in that case above, if 3.8 is removed, it found Interpreter+Development).

I suspect something like this is going on in this conda-build, so that possibly the python install provides a new version of the interpreter, but not the new version of development files. Or maybe it provides both, but cmake finds the 'other' version of Python on the build machine.

[PiotrZierhoffer]

@hzeller In prjtrellis package we have the following (https://github.com/litex-hub/litex-conda-eda/blob/master/bit/prjtrellis/build.sh#L23)

    -DPYTHON_EXECUTABLE=$(which python) \
    -DPYTHON_INCLUDE_DIR=$(python -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())")  \
    -DPYTHON_LIBRARY=$(python -c "import distutils.sysconfig as sysconfig; print(sysconfig.get_config_var('LIBDIR'))") \

If you can run the interpreter before running cmake, maybe this is the easiest way to approach it?

GitHub

litex-hub/litex-conda-eda

Conda recipes for FPGA EDA tools for simulation, synthesis, place and route and bitstream generation. - litex-hub/litex-conda-eda

[PiotrZierhoffer]

Using these variables is also mentioned here: https://cmake.org/cmake/help/v3.0/module/FindPythonLibs.html

FindPythonLibs — CMake 3.0.2 Documentation

[PiotrZierhoffer]

Agreed. I thought this problem is there despite having python in the build section.

[tgorochowik]

@hzeller I reopened #107 in which besides moving the python requirement I modified the build instructions to mimic what we do for the uhdm-integration packages (for which the surelog build works).

[hzeller]

Closing. #107 is the right one.