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GeezerVison is showing github.com — TCGETA, TCSETA, TCSETAF, TCSETAW termios ioctl no longer usable on all architectures with glibc 2.42 · Issue #142379 · python/cpython

TCGETA, TCSETA, TCSETAF, TCSETAW termios ioctl no longer usable on all architectures with glibc 2.42 #142379

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TCGETA, TCSETA, TCSETAF, TCSETAW termios ioctl no longer usable on all architectures with glibc 2.42#142379
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OS-linuxOS-unsupportedbuildThe build process and cross-buildThe build process and cross-buildextension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@tpetazzoni
tpetazzoni
opened on Dec 7, 2025
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Bug report

Bug description:

The build of cpython is broken with glibc 2.42 on at least the alpha, hppa and sparc64 architectures, as reported for example on Gentoo: https://bugs.gentoo.org/962600, but also affecting Buildroot: https://autobuild.buildroot.net/results/e7d/e7d951b06e9338e622fe96b0fb02823b1ef5235c/build-end.log. The build failure looks like this:

./Modules/termios.c:1119:16: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1119 |     {"TCGETA", TCGETA},
      |                ^~~~~~
./Modules/termios.c:1131:16: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1131 |     {"TCSETA", TCSETA},
      |                ^~~~~~
./Modules/termios.c:1134:17: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1134 |     {"TCSETAF", TCSETAF},
      |                 ^~~~~~~
./Modules/termios.c:1137:17: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1137 |     {"TCSETAW", TCSETAW},
      |                 ^~~~~~~

The problem is that on those architectures, ioctls.h reference "struct termio", which has been removed from glibc 2.42. https://lists.gnu.org/archive/html/info-gnu/2025-07/msg00011.html.

While the issue is being fixed in the upstream Linux kernel, it will take time for those fixes to propagate, and a fix in Python would be relevant. PR coming.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

  • gh-142379: configure.ac: detect unusable termio operations #142380

Activity

  1. tpetazzoni
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Dec 7, 2025
  2. picnixz
    added
    buildThe build process and cross-buildThe build process and cross-build
    OS-unsupported
    on Dec 7, 2025
  3. github-project-automation
    added this to Unsupported platformson Dec 7, 2025
  4. picnixz
    added
    extension-modulesC modules in the Modules dirC modules in the Modules dir
    OS-linux
    on Dec 7, 2025

  5. mjt0k commented on Jan 21, 2026

    @mjt0k
    mjt0k
    on Jan 21, 2026
    More actions

    This issue feels like a distribution problem really, not cpython problem. FWIW.

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    OS-linuxOS-unsupportedbuildThe build process and cross-buildThe build process and cross-buildextension-modulesC modules in the Modules dirC modules in the Modules dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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