René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Enhance Cygwin support","articleBody":"Cygwin is a free and open-source Unix-like environment and command-line interface for Microsoft Windows. There is an on-going effort to support Cygwin in Python. I create this meta-issue to track other Cygwin sub-issues.\n\nTo install Cygwin on Windows and build CPython in Cygwin, you can use these commands:\n\n* Download https://cygwin.com/setup-x86_64.exe\n* Run setup-x86_64.exe : select `gcc-core`, `make`, `libffi-devel`, `libssl-devel` and `zlib-devel` packages (I also installed `vim`, my favorite text editor 😁).\n* Start Cygwin shell (icon on the desktop).\n* Type: `git config --global core.autocrlf input` -- I had issues with newlines in the `./configure` script without that.\n* Run `git clone https://github.com/python/cpython/ --depth=1`\n* Type: `cd cpython`\n* Type: `./configure --with-pydebug --cache-file=../configure.cache --without-mimalloc`\n* Type: `make -j8`\n\nmimalloc is disabled because it fails at startup on Cygwin with:\n\n```\n$ PYTHONMALLOC=mimalloc ./python.exe -c pass\nmimalloc: warning: cannot decommit OS memory (error: 22 (0x16), address: 0x20000430000, size: 0x1bd0000 bytes)\nmimalloc: assertion failed: at \"Objects/mimalloc/os.c\":444, mi_os_decommit_ex\n  assertion: \"err == 0\"\nAborted\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-149880\n* gh-149885\n* gh-149890\n* gh-149896\n* gh-149897\n* gh-149899\n* gh-149903\n* gh-149910\n* gh-149913\n* gh-149999\n* gh-150031\n* gh-150081\n* gh-150084\n* gh-150248\n* gh-150250\n* gh-150252\n* gh-150412\n* gh-150415\n* gh-150416\n* gh-150417\n* gh-150418\n* gh-150419\n* gh-150426\n* gh-150431\n* gh-150432\n* gh-150438\n* gh-150440\n* gh-150441\n* gh-150483\n* gh-150495\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2026-05-15T13:11:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":23},"url":"https://github.com/149879/cpython/issues/149879"}