Option to use pip install --use-feature=in-tree-build

[fx-kirin]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

pypa/pip#9091

The option of pip --use-feature=in-tree-build will be added on the version 21.1.

I want to use it with poetry because of this problem.

[abn]

@fx-kirin how do you think this be used within the poetry context? Is this for cases where nested local path dependencies refer to relative paths within their own dependencies?

[fx-kirin]

I'm not sure what it should be because I"m not a heavy user of poetry. But I hope I can set an option with something like poetry config because I think normally, local packages doesn't need to be copied to temporary folder to build the package.

Sorry I couldn't get the meaning of what you said "cases" exactcly. But if you use the relative path to outside of the package in Cargo.toml, it should be happened.

[fx-kirin]

in-tree-build is now default with pip.

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