[ruby-core:122649] [Ruby Misc#21500] Backport gcc 15 support

3 Jul 2025


      Issue #21500 has been reported by nobu (Nobuyoshi Nakada).

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Misc #21500: Backport gcc 15 support
https://bugs.ruby-lang.org/issues/21500

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
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commit:b42afa1dbcb Suppress gcc 15 unterminated-string-initialization warnings
commit:f1f0cc14cc7 Separate `__has_attribute` from `defined(__has_attribute)`
commit:543e3a1896a Cast up `int` instruction code to `VALUE`
commit:ed2806117a0 Do not let files depend on a phony target
commit:46e4c867374 Detect `clock_gettime` and `clock_getres` for winpthreads


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