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gh-129438: Update --enable-experimental-jit section with install requirements #129450

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Jan 30, 2025
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gh-129438: Update --enable-experimental-jit section with install requirements #129450

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Update configure.rst
StanFromIreland Jan 29, 2025
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Update Tools/jit/README.md
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4 changes: 4 additions & 0 deletions Doc/using/configure.rst
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Expand Up @@ -311,6 +311,10 @@ General Options

By convention, ``--enable-experimental-jit`` is a shorthand for ``--enable-experimental-jit=yes``.

.. note::

When building CPython with JIT enabled, ensure that your system has Python 3.11 or later installed.

.. versionadded:: 3.13

.. option:: PKG_CONFIG
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4 changes: 3 additions & 1 deletion Tools/jit/README.md
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Expand Up @@ -3,6 +3,8 @@ The JIT Compiler

This version of CPython can be built with an experimental just-in-time compiler[^pep-744]. While most everything you already know about building and using CPython is unchanged, you will probably need to install a compatible version of LLVM first.

Note that Python 3.11 or newer is required to build JIT.

## Installing LLVM

The JIT compiler does not require end users to install any third-party dependencies, but part of it must be *built* using LLVM[^why-llvm]. You are *not* required to build the rest of CPython using LLVM, or even the same version of LLVM (in fact, this is uncommon).
Expand Down Expand Up @@ -54,7 +56,7 @@ For `PCbuild`-based builds, pass the new `--experimental-jit` option to `build.b

For all other builds, pass the new `--enable-experimental-jit` option to `configure`.

Otherwise, just configure and build as you normally would. Cross-compiling "just works", since the JIT is built for the host platform.
Otherwise, just configure and build as you normally would. Cross-compiling "just works", since the JIT is built for the host platform.

The JIT can also be enabled or disabled using the `PYTHON_JIT` environment variable, even on builds where it is enabled or disabled by default. More details about configuring CPython with the JIT and optional values for `--enable-experimental-jit` can be found [here](https://docs.python.org/dev/whatsnew/3.13.html#experimental-jit-compiler).

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