2bdd41b8c0
Although this issue is not specific to macOS, Python (in)compatibility comes up quite often and we've been linking users to this page. This just adds more details for this particular scenario. Differential revision: https://reviews.llvm.org/D82507
72 lines
2.2 KiB
ReStructuredText
72 lines
2.2 KiB
ReStructuredText
Caveats
|
|
=======
|
|
|
|
.. contents::
|
|
:local:
|
|
|
|
.. _python_caveat:
|
|
|
|
Python
|
|
------
|
|
|
|
LLDB has a powerful scripting interface which is accessible through Python.
|
|
Python is available either from within LLDB through a (interactive) script
|
|
interpreter, or as a Python module which you can import from the Python
|
|
interpreter.
|
|
|
|
To make this possible, LLDB links against the Python shared library. Linking
|
|
against Python comes with some constraints to be aware of.
|
|
|
|
1. It is not possible to build and link LLDB against a Python 3 library and
|
|
use it from Python 2 and vice versa.
|
|
|
|
2. It is not possible to build and link LLDB against one distribution on
|
|
Python and use it through a interpreter coming from another distribution.
|
|
For example, on macOS, if you build and link against Python from
|
|
python.org, you cannot import the lldb module from the Python interpreter
|
|
installed with Homebrew.
|
|
|
|
3. To use third party Python packages from inside LLDB, you need to install
|
|
them using a utility (such as ``pip``) from the same Python distribution as
|
|
the one used to build and link LLDB.
|
|
|
|
The previous considerations are especially important during development, but
|
|
apply to binary distributions of LLDB as well.
|
|
|
|
LLDB in Xcode on macOS
|
|
``````````````````````
|
|
|
|
Users of lldb in Xcode on macOS commonly run into these issues when they
|
|
install Python, often unknowingly as a dependency pulled in by Homebrew or
|
|
other package managers. The problem is the symlinks that get created in
|
|
``/usr/local/bin``, which comes before ``/usr/bin`` in your path. You can use
|
|
``which python3`` to check to what it resolves.
|
|
|
|
To be sure you use the Python that matches with the lldb in Xcode use ``xcrun``
|
|
or use the absolute path to the shims in ``/usr/bin``.
|
|
|
|
::
|
|
|
|
$ xcrun python3
|
|
$ /usr/bin/python3
|
|
|
|
Similarly, to install packages and be able to use them from within lldb, you'll
|
|
need to install them with the matching ``pip3``.
|
|
|
|
::
|
|
|
|
$ xcrun pip3
|
|
$ /usr/bin/pip3
|
|
|
|
The same is true for Python 2. Although Python 2 comes with the operating
|
|
system rather than Xcode, you can still use ``xcrun`` to launch the system
|
|
variant.
|
|
|
|
::
|
|
|
|
$ xcrun python
|
|
$ /usr/bin/python
|
|
|
|
Keep in mind that Python 2 is deprecated and no longer maintained. Future
|
|
versions of macOS will not include Python 2.7.
|