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gh-131189: Fix "msvcrt" import warning on Linux when "_ctypes" is not available.#131201

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ambv merged 1 commit intopython:mainfromplashchynski:fix_msvcrt_warning_on_linux
Jul 15, 2025

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plashchynski
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@plashchynskiplashchynski commentedMar 13, 2025•
edited by bedevere-appbot
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On Linux, compiling without "libffi" causes a misleading warning
"No module named 'msvcrt'" when launching PyREPL.

On Linux, compiling without "libffi" causes a"No module named 'msvcrt'" warning when launching PyREPL.
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Most changes to Pythonrequire a NEWS entry. Add one using theblurb_it web app or theblurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply theskip news label instead.

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I cannot recreate the same setup as you have, can you please share what happens with this change in place?

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@sobolevn steps to reproduce on a fresh Ubuntu Server 24.04.2 setup:

sudo apt install build-essentialgit clone https://github.com/python/cpython.gitcd cpython./configuremake

Then:

./python

shows:

Python 3.14.0a5+ (heads/main:c497f83ad85, Mar 14 2025, 09:42:58) [GCC 13.3.0] on linuxType "help", "copyright", "credits" or "license" for more information.warning: can't use pyrepl: No module named 'msvcrt'>>>

Here's afull log.

with changes in this PR, it shows the following with the same setup:

Python 3.14.0a5+ (heads/fix_msvcrt_warning_on_linux:56364cef29, Mar 14 2025, 09:49:25) [GCC 13.3.0] on linuxType "help", "copyright", "credits" or "license" for more information.warning: can't use pyrepl: No module named '_ctypes'>>>

Here's afull log.

warning: can't use pyrepl: No module named 'msvcrt'

this warning is misleading, becausemsvcrt is available only on NT systems.

warning: can't use pyrepl: No module named '_ctypes'

this warning is consistent with the warningmake shows for missing necessary bits:

The necessary bits to build these optional modules were not found:_bz2                      _ctypes                   _ctypes_test           _curses                   _curses_panel             _dbm                   _gdbm                     _hashlib                  _lzma                  _ssl                      _tkinter                  _uuid                  readline                  zlib                                             To find the necessary bits, look in configure.ac and config.log.
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Thanks, it is clear now! LGTM. However, I am not the module's maintainer, let's wait for them to make the final decision :)

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LGTM

@ambvambv merged commitf320c95 intopython:mainJul 15, 2025
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@ambvambv added the needs backport to 3.14bugs and security fixes labelJul 15, 2025
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Thanks@plashchynski for the PR, and@ambv for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull requestJul 15, 2025
…is not available. (pythonGH-131201)Fix "msvcrt" import warning on Linux when "_ctypes" is not available.On Linux, compiling without "libffi" causes a"No module named 'msvcrt'" warning when launching PyREPL.(cherry picked from commitf320c95)Co-authored-by: Dzmitry Plashchynski <plashchynski@gmail.com>
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GH-136668 is a backport of this pull request to the3.14 branch.

@bedevere-appbedevere-appbot removed the needs backport to 3.14bugs and security fixes labelJul 15, 2025
ambv pushed a commit that referenced this pull requestJul 15, 2025
… is not available. (GH-131201) (GH-136668)Fix "msvcrt" import warning on Linux when "_ctypes" is not available.On Linux, compiling without "libffi" causes a"No module named 'msvcrt'" warning when launching PyREPL.(cherry picked from commitf320c95)Co-authored-by: Dzmitry Plashchynski <plashchynski@gmail.com>
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@vstinnervstinnervstinner approved these changes

@sobolevnsobolevnsobolevn approved these changes

@pablogsalpablogsalAwaiting requested review from pablogsalpablogsal is a code owner

@lysnikolaoulysnikolaouAwaiting requested review from lysnikolaoulysnikolaou is a code owner

@ambvambvAwaiting requested review from ambvambv is a code owner

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