Support :python option in compile-time config - #48
Merged
jonatanklosko merged 1 commit intoMay 18, 2026
Merged
Conversation
Copy link
Copy Markdown
Contributor
Sorry, something went wrong.
The :python option (e.g., "3.14t" for free-threaded builds) was read from Application.compile_env but never forwarded to Pythonx.Uv.fetch/3 or Pythonx.Uv.init/3. This caused uv to download the regular Python build instead of the free-threaded variant.
jonatanklosko
approved these changes
May 18, 2026
jonatanklosko
left a comment
Copy link
Copy Markdown
Member
There was a problem hiding this comment.
Good call, thank you :)
Sorry, something went wrong.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Context
PR #45 added the :python option to Pythonx.uv_init/2 (the runtime function), which works correctly. However, the compile-time config path in application.ex was not updated to forward this option. Users following the recommended Mix project setup via config :pythonx, :uv_init silently get the wrong Python variant.
Change
One line in lib/pythonx/application.ex — read :python from the config and include it in the opts passed to fetch/3 and init/3:
Verification
Tested on macOS aarch64. Before the fix, config :pythonx, :uv_init, python: "3.14t" downloads cpython-3.14.3-macos-aarch64-none (regular). After the fix, it downloads cpython-3.14.3+freethreaded-macos-aarch64-none and confirms GIL disabled.