René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Consider adding `-Werror=unguarded-availability-new` to compiler flags for Apple platforms","articleBody":"# Feature or enhancement\r\n\r\nRuntime crashes like #97897 could be prevented by turning clang's `unguaded-availability-new` warning into a fatal compile error. This can be done by adding `-Werror=unguarded-availability-new` to compiler flags.\r\n\r\nEssentially what this warning does is cross reference undefined symbols against symbols defined in the targeted Apple SDK. If it sees a symbol introduced in a newer SDK version and that symbol isn't weakly referenced/linked, you get a warning. `-Werror` upconverts it to a fatal compiler error.\r\n\r\nIf you add this flag to release builds, the compiler prevents you from shipping binaries that ship unguarded symbol usage for targeted SDK versions. i.e. it prevents run-time crashes when binaries run on older Apple OS versions.\r\n\r\nIf you enable this setting today, you may find the 3.8 branch isn't properly gating use of `mkfifoat` and `mknodat`. (Although this may be an oddity from python-build-standalone and not a CPython bug.) \r\n\r\ncc @ned-deily \r\n\r\n---\r\n\r\nThe advantages of having this additional warning is to catch regressions such as:\r\n\r\n- https://github.com/python/cpython/issues/123797\r\n- https://github.com/python/cpython/issues/75782\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-128155\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/indygreg","@type":"Person","name":"indygreg"},"datePublished":"2022-12-21T02:12:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/100384/cpython/issues/100384"}