When using std::filesystem::path under Cygwin or Non-Windows with wide-character strings, there was an implicit conversion to/from ASCII, leading to errors when dealing with Unicode filenames.
The attached patch fixes this behavior by using the correct transformations to the internal representation (from/to UTF16 for Cygwin, UTF32 for other non-Windows systems). libstdc++-v3/ChangeLog: * include/bits/fs_path.h: fixed Cygwin+Unix wide character handling * testsuite/27_io/filesystem/path/construct/90281.cc: Moved to... * testsuite/27_io/filesystem/path/construct/unicode_paths.cc: ...here. added testcase * testsuite/27_io/filesystem/path/native/string.cc: added testcase for wide character output Some notes: I found the documentation on submissions in some respects unclear and confusing, so please correct me if I did something wrong. I assume that you also need a copyright transfer from my company? The definition of "small change" and the process for the copyright transfer is one of the unclear issues. Also, I did not fix the case of __GNUC_WIDE_EXECUTION_CHARSET_NAME that is mentioned in the bug discussion. This should be even more exotic, and is well outside my current skill level and allotted time budget. Also, this being my only patch for the foreseeable future, I have not subscribed to the mailing list. Regards, Ulf Lorenz
<<attachment: patch.zip>>
