[clang] [Clang] Implement C++26 Attributes for Structured Bindings (P0609R3) (PR #89906)

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cor3ntin wrote:

> Thank you working on this. I'm really like this feature! I've a question, do we have any further plans to support GNU extension attributes(e.g. __attribute__((aligned)))? Although it is not included in the paper.

No, sorry!

My goal here is to increase conformance, not to invent new extensions.
If someone wants to do that work, they would have to motivate the change, do the design leg work and synchronize with GCC.
More generally, supporting GNU syntax in relatively new, C++ specific constructs is probably of limited use.
If there were attributes useful in structured binding that don't yet have a `[[]]` spelling, we should probably would want to fix that instead.


https://github.com/llvm/llvm-project/pull/89906