[llvm-bugs] [Bug 48081] New: always fatal error (no such file or directory) for mingw (x86_64-w64-mingw32-gcc-8 (GCC) 8.3-win32 20190406)

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https://bugs.llvm.org/show_bug.cgi?id=48081

            Bug ID: 48081
           Summary: always fatal error (no such file or directory) for
                    mingw (x86_64-w64-mingw32-gcc-8 (GCC) 8.3-win32
                    20190406)
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows 2000
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: info at ustchcs.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

HeaderSearch.cpp (getFileAndSuggestModule) compares std::error_code from
different libraries which has portability issues. We observed on mingw
(x86_64-w64-mingw32-gcc-8 (GCC) 8.3-win32 20190406) this comparison is always
true when compiled as shared libraries. The std::error_category is assumed to
be singleton and the comparison relies on the unique address but it does not
always hold.

The possible fix is avoiding this kind of comparison or fallback to value
comparing and error_category's name comparing.

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