gh-46927: Prevent readline from overriding environment#153184
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Readline library will set the LINES and COLUMNS environment variables during initialization. One might expect these variables to be updated later on SIGWINCH, but this is not the case with cpython. As a consequence, when the readline module is imported, any process launched from cpython with the default environment will have LINES and COLUMNS variables set, potentially to a wrong value. Use the rl_change_environment global variable to disable this initial setup of the environment variables.
Guard the rl_change_environment assignment with HAVE_RL_CHANGE_ENVIRONMENT, set by a configure link test, instead of the __APPLE__ macro. This compiles it out on any libedit build lacking the symbol, not just on macOS. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Readline library will set the LINES and COLUMNS environment variables during initialization. One might expect these variables to be updated later on SIGWINCH, but this is not the case with cpython.
As a consequence, when the readline module is imported, any process launched from cpython with the default environment will have LINES and COLUMNS variables set, potentially to a wrong value.
Use the rl_change_environment global variable to disable this initial setup of the environment variables.
Issue #46927
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Sorry, I completely broke the original PR and it got closed: #133585
@ZeroIntensity , @serhiy-storchaka , you did contribute to the discussion of the first PR, so you might have some comments.