On Tue, 28 Jun 2022 at 15:24, Jonathan Wakely via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
> --- a/libstdc++-v3/src/filesystem/dir-common.h
> +++ b/libstdc++-v3/src/filesystem/dir-common.h
> @@ -25,6 +25,7 @@
>  #ifndef _GLIBCXX_DIR_COMMON_H
>  #define _GLIBCXX_DIR_COMMON_H 1
>
> +#include <stdint.h>  // uint32_t
>  #include <string.h>  // strcmp
>  #include <errno.h>
>  #if _GLIBCXX_FILESYSTEM_IS_WINDOWS
> @@ -91,12 +92,50 @@ is_permission_denied_error(int e)
>
>  struct _Dir_base
>  {
> +  // As well as the full pathname (including the directory iterator's path)
> +  // this type contains a file descriptor for a directory and a second pathname
> +  // relative to that directory. The file descriptor and relative pathname
> +  // can be used with POSIX openat and unlinkat.
> +  struct _At_path
> +  {
> +    // No file descriptor given, so interpret the pathname relative to the CWD.
> +    _At_path(const char* p) noexcept

I forgot to consistently use the char_type alias to support wchar_t
paths on Windows. Fixed by the attached patch.

Tested x86_64-linux and x86_64-mingw32, pushed to trunk.