[Openmp-commits] [libcxx] [openmp] [libc++] basic_ios<wchar_t> cannot store fill character WCHAR_MAX (PR #89305)

[Louis Dionne via Openmp-commits]

ldionne wrote:

@xingxue-ibm The most likely thing here is that this patch changed the size, alignment, trailing padding or some triviality property of `basic_ios` when the ABI flag is disabled. Maybe the `_LIBCPP_PACKED` attribute is to blame? Either way, if we can't figure it out quickly, we should probably revert this because we are close to the LLVM 19 release and we want the tree to be as stable as possible.

Also, once we figure it out, we should add a test for that.

https://github.com/llvm/llvm-project/pull/89305