MSVC guarantee ABI compatibility between different versions of MSVC, not with the inter-compiler ABI mentioned by parent comment. But the parent comment's poin

MSVC guarantee ABI compatibility between different versions of MSVC, not with the inter-compiler ABI mentioned by parent comment. But the parent comment's point is that, even for those different compilers that do follow that inter-compiler ABI, the standard libraries have different binary layouts from other compilers. Your final two links show that GCC and LLVM standard libraries each have the same binary layout as itself between different versions, but not as the other.