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Note on building in windows given multiple Python installations #4245

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Note on building in windows given multiple Python installations #4245

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Added Note to Windows-Development-Setup.rst
coarsedamavand Mar 29, 2024
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Merge branch 'ros2:rolling' into rolling
coarsedamavand May 27, 2024
6fa21db
Update CMake args fo Python specification
coarsedamavand May 27, 2024
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6 changes: 6 additions & 0 deletions source/Installation/Alternatives/Windows-Development-Setup.rst
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Expand Up @@ -93,6 +93,12 @@ To build the ``\{DISTRO}`` folder tree:
We're using ``--merge-install`` here to avoid a ``PATH`` variable that is too long at the end of the build.
If you're adapting these instructions to build a smaller workspace then you might be able to use the default behavior which is isolated install, i.e. where each package is installed to a different folder.

.. note::

If multiple versions of Python 3 are installed, cmake-args can be set in order to ensure only the desired Python 3 executable and library folders are used for the build:
``colcon build --merge-install --cmake-args -DPython3_ROOT_DIR=<python-root-dir> -DPython3_FIND_STRATEGY=LOCATION -DPython3_FIND_REGISTRY=NEVER``
where ``<python-root-dir>`` is e.g. ``C:\Python38`` (the location Chocolatey will install Python)

.. note::

If you are doing a debug build use ``python_d path\to\colcon_executable`` ``colcon``.
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