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[3.13] Add note about PYTHON_JIT environment variable to JIT README (GH-121635) #121942

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Jul 17, 2024
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[3.13] Add note about PYTHON_JIT environment variable to JIT README (GH-121635) #121942

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8 changes: 6 additions & 2 deletions Tools/jit/README.md
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The JIT Compiler
================

This version of CPython can be built with an experimental just-in-time compiler. 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.
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.

## Installing LLVM

Expand Down Expand Up @@ -57,6 +57,10 @@ 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).

[^pep-744]: [PEP 744](https://peps.python.org/pep-0744/)

[^why-llvm]: Clang is specifically needed because it's the only C compiler with support for guaranteed tail calls (`musttail`), which are required by CPython's continuation-passing-style approach to JIT compilation. Since LLVM also includes other functionalities we need (namely, object file parsing and disassembly), it's convenient to only support one toolchain at this time.