lib/commonio.h: Use [[gnu::copy()]] and typeof() for function pointers compatible with libc#1325

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alejandro-colomar wants to merge 9 commits intoshadow-maint:masterfrom

alejandro-colomar:typeof

Commits on Oct 27, 2025

lib/attr.h: MAYBE_UNUSED: Implement with [[maybe_unused]]
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lib/attr.h: NORETURN: Implement with [[noreturn]]
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lib/attr.h: format_attr(): Use it also with Clang
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lib/attr.h: ATTR_ACCESS(): Use it also with Clang
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lib/attr.h: ATTR_ALLOC_SIZE(): Use it also with Clang
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lib/attr.h: ATTR_STRING(): Use it also with Clang
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src/: usage(): Use [[noreturn]]
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lib/attr.h: ATTR_COPY(): Add wrapper for [[gnu::copy()]]
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lib/commonio.h: Use [[gnu::copy()]] and typeof() for function pointers compatible with libc
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