matplotlib-cpp/cci.20210111

[blackliner]

Specify library name and version: matplotlib-cpp/cci.20210111

Looking for feedback regarding the python 3 requirement, do we have a system package?

Requesting issue: #3033

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[SpaceIm]

Can't be added right now, it requires cpython recipe: #1510

[blackliner]

Can't be added right now, it requires cpython recipe: #1510

Don't want to start a big discussion, but can't we assume with certainty that python is available? I mean, no python, no conan?

[SpaceIm]

Can't be added right now, it requires cpython recipe: #1510

Don't want to start a big discussion, but can't we assume with certainty that python is available? I mean, no python, no conan?

It depends how it was installed. python might not be available (conan windows installer for example).
Moreover:

• consumers might be surprised to be "polluted" with numpy in their system installed python.
• no control on python version

[blackliner]

It depends how it was installed. python might not be available (conan windows installer for example).
Moreover:

• consumers might be surprised to be "polluted" with numpy in their system installed python.

Fully agree, just curious to see if that actually works on CCI-CI 🙈

• no control on python version

For this package, I do not really care, but I get the point, for example if you need 3.x

The PR you mentioned tries to make python available from scratch, why not start with a python/system@ package first?

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[uilianries]

It requires numpy first.

[SpaceIm]

And cpython recipe.

[blackliner]

So, long story short, its currently impossible to build packages that depend on python?

Would depending on python/system be an alternative?

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[blackliner]

@uilianries @SpaceIm : Is it possible at all to depend on python and/or numpy in the current state of the CCI? Are there any other packages that do something similar? I don't know if it makes sense to grab another copy of python and numpy for this package, I think its safe to just check if those packages exist on the users system, and error out if that is not the case.

But how should one tell this to the CCI-CI ?

[SpaceIm]

Currently, several recipes implicitly rely on python as a build requirement. But for matplotlib-cpp, it's worse, it's a requirement, it links to python library.

[blackliner]

Currently, several recipes implicitly rely on python as a build requirement. But for matplotlib-cpp, it's worse, it's a requirement, it links to python library.

So, no luck for now?

[SpaceIm]

Yes, "Welcome to matplotlib-cpp, possibly the simplest C++ plotting library" is not true for conan 😞

[conan-center-bot]

Failure in build 11 (45185a84907529755259052bc9a3d0ea7b7de7c2):

• matplotlib-cpp/cci.20210601@:
  CI failed to create some packages (All logs)

  Logs for packageID 5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9:

  [settings]
  arch=x86_64
  arch_build=x86_64
  build_type=Release
  compiler=gcc
  compiler.libcxx=libstdc++
  compiler.version=4.9
  os=Linux
  os_build=Linux
  

  [...]
  -- Conan: Adjusting language standard
  -- Conan: Checking correct version: 4.9
  -- Conan: C++ stdlib: libstdc++
  -- Conan: Using autogenerated Findmatplotlib-cpp.cmake
  -- Found matplotlib-cpp: cci.20210601 (found version "cci.20210601") 
  -- Found Python3: /opt/pyenv/versions/3.6.7/bin/python3.6 (found version "3.6.7") found components: Interpreter Development Development.Module Development.Embed 
  -- Configuring done
  -- Generating done
  -- Build files have been written to: /home/conan/w/BuildSingleReference/conan-center-index/recipes/matplotlib-cpp/all/test_package/build/dfae4d6ba682b8d9c5630c4c912db585c2a46c64
  
  ----Running------
  > cmake --build '/home/conan/w/BuildSingleReference/conan-center-index/recipes/matplotlib-cpp/all/test_package/build/dfae4d6ba682b8d9c5630c4c912db585c2a46c64' '--' '-j3'
  -----------------
  Scanning dependencies of target test_package
  [ 50%] Building CXX object CMakeFiles/test_package.dir/test_package.cpp.o
  [100%] Linking CXX executable bin/test_package
  [100%] Built target test_package
  matplotlib-cpp/cci.20210601 (test package): Running test()
  
  ----Running------
  > bin/test_package
  -----------------
  matplotlib-cpp/cci.20210601: WARN: Lib folder doesn't exist, can't collect libraries: /home/conan/w/BuildSingleReference/.conan/data/matplotlib-cpp/cci.20210601/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/lib
  WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip.
  Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
  To avoid this problem you can invoke Python with '-m pip' instead of running pip directly.
  WARNING: You are using pip version 21.1.2; however, version 21.1.3 is available.
  You should consider upgrading via the '/opt/pyenv/versions/3.6.7/bin/python3.6 -m pip install --upgrade pip' command.
  CMake Warning:
    Manually-specified variables were not used by the project:
  
      CMAKE_EXPORT_NO_PACKAGE_REGISTRY
      CMAKE_INSTALL_BINDIR
      CMAKE_INSTALL_DATAROOTDIR
      CMAKE_INSTALL_INCLUDEDIR
      CMAKE_INSTALL_LIBDIR
      CMAKE_INSTALL_LIBEXECDIR
      CMAKE_INSTALL_OLDINCLUDEDIR
      CMAKE_INSTALL_SBINDIR
  
  
  WARNING: /opt/pyenv/versions/3.6.7/lib/python3.6/site-packages/conans/client/tools/oss.py:474: UserWarning: Argument 'settings' has been deprecated, use 'conanfile' instead
    warnings.warn("Argument 'settings' has been deprecated, use 'conanfile' instead")
  
  terminate called after throwing an instance of 'std::runtime_error'
    what():  Error loading module matplotlib!
  Aborted
  ERROR: matplotlib-cpp/cci.20210601 (test package): Error in test() method, line 33
  	self.run(bin_path, run_environment=True)
  	ConanException: Error 134 while executing bin/test_package
  

---

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