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Commit 283cb372, "Cygwin: normalize_win32_path: improve error checking", required a prefix '\\?\' or '\??\' in the source path to be followed by 'UNC\' or 'X:\', where X is a drive letter. That was too restrictive, since it disallowed the paths '\\?\X: and '\??\X:'. This caused problems when a user tried to use the root of a drive as the Cygwin installation root, as reported here: https://cygwin.com/ml/cygwin/2020-01/msg00111.html Modify the requirement so that '\??\X:' and '\\?\X:' are now allowed as source paths, without a trailing backslash.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin