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In SDK 15, Apple have used a macro (
__has_extension()
) which isn't supported by GCC up to and including 13.2. It will be supported in 13.3 and 14.1.See this StackOverflow question & my answer, also this Homebrew discussion.
Unfortunately the unfixed version works fine under Github CI, and I don’t see how to update to show that it doesn’t work with SDK 15.