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42a8ff877d
`<wchar.h>` should at least include the forward declaration of `struct tm`,
since it's needed for the `wcsftime` declaration (also, see
https://man7.org/linux/man-pages/man0/wchar.h.0p.html).
Even though we don't yet have `wcsftime`, some downstream users (notably
- libcxx) expects to see `struct tm` declaration there, to re-declare it under
`std` namespace:
c46bfed1a4/libcxx/include/cwchar (L135)
So, add this type declaration to llvm-libc version of `wchar.h` now.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.