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Python needs splicing #104135

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#104201
Closed
Python needs splicing#104135
#104201
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0.kind: bugSomething is broken6.topic: cross-compilationBuilding packages on a different platform than they will be used on6.topic: pythonPython is a high-level, general-purpose programming language.
@Ericson2314

Description

@Ericson2314
Ericson2314
opened on Nov 18, 2020

Describe the bug
Non-buildInputs that are python packages shouldn't be provided by the same package set in cross builds.

(Grep __splicedPackages so see the nasty stuff the Haskell and xorg package sets do today, that's what we need to cargo cult.)

I'm happy to help fix this, but it would be nice to do in conjunction with the python maintainers rather than pure async.

To Reproduce
On staging today fad48e3:

 $ nix-diff /nix/store/ampk9xikalzrlmcnn69jk056xnj1bfma-python2.7-PyStemmer-2.0.1.drv /nix/store/78l2xl541qn32qsv2as3zg88s6dh9qr6-python2.7-PyStemmer-2.0.1.drv
- /nix/store/ampk9xikalzrlmcnn69jk056xnj1bfma-python2.7-PyStemmer-2.0.1.drv:{out}
+ /nix/store/78l2xl541qn32qsv2as3zg88s6dh9qr6-python2.7-PyStemmer-2.0.1.drv:{out}
• The input named `python2.7-Cython-0.29.21` differs
  - /nix/store/kx6nqrm0k5vsri107pshj0ar5arawzih-python2.7-Cython-0.29.21.drv:{out}
  + /nix/store/xr0g9x2m0mhy39rhsi7vb4nzjswxzbcp-python2.7-Cython-0.29.21.drv:{out}
  • The set of input names do not match:
      - aarch64-unknown-linux-gnu-gdb-10.1
      + gdb-10.1
  • The environments do not match:
      buildInputs=''
          /nix/store/nwk8rivbjixsi9f9aghdx3940ga5px0w-glibc-locales-2.32 /nix/store/pxq11mmxrlqqmzjsv2cx8r9kqq75f8j73ap194mbw5-aarch6p2jb4-unknoy6rwn-gxqfwlinu6x-gnu-gdb-10.1
      ''
• Skipping environment comparison

Expected behavior
those two derivations are the same

Additional context

  • GDB in particular maybe could be more multi-target, but nevermind that for now.
  • Cython I suppose should be able to cross compile, so it makes sense that GDB might really need to be used with non-native binaries.

Notify maintainers
CC @FRidh

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: HUGE, but cross-only
# a list of nixos modules affected by the problem
module: probably big too

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    0.kind: bugSomething is broken6.topic: cross-compilationBuilding packages on a different platform than they will be used on6.topic: pythonPython is a high-level, general-purpose programming language.

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