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[[ ]] attributes were added in C++11 and later C23. There are 7 standard(C32) attributes but GCC has hundreds of them.

The `[[attribute]]` syntax is new, the builtin ones in C23 are `[[deprecated]]`, `[[fallthrough]]`, `[[maybe_unused]]`, `[[nodiscard]]`, `[[noreturn]]`, `[[reproducible]]`, and `[[unsequenced]]`.

The feature itself is probably still __attribute__((cleanup(f))). That’s documented at https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attribute...

C standard _may_ eventually have a feature semantically equivalent, but very different syntactically:

https://thephd.dev/_vendor/future_cxx/technical%20specificat...

Discussion:

https://thephd.dev/_vendor/future_cxx/papers/C%20-%20Improve...