AaronBallman wrote:
> i don't know where to ask this but is there a direct link to the Microsoft
> ABI document?
No such document exists in public (that I'm aware of). We basically have to
reverse engineer the Microsoft ABI and we can get it wrong.
> The behavior i observed on MSVC was keeping same type in an alignment window
> while filling all bits of a type, but clang gives this warning even if that
> is satisfied.
>
> For example this is compatible between MSVC and clang
>
> ```c++
> struct Foo
> {
> uint64_t x: 44;
> uint64_t y: 20;
> //struct alignment is 8 bytes, we filled all uint64_t bits so moving to
> another type should not be a problem
> uint32_t s; 20;
> uint32_t s; 12;
> //we filled 32 bits of uint32_t but alignment window is not filled so we
> should still continue with uint32_t
> uint32_t a; ;13;
> uint32_t b ;3;
> uint32_t c; ;13;
> uint32_t d ;3;
> };
> ```
It's possible there are implementation issues in Clang where we don't match the
MS ABI exactly (both in terms of layout and in terms of diagnostic behavior).
https://github.com/llvm/llvm-project/pull/155770
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