Handle long file paths on Windows

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Author: rnk

clang-tools-extra/test/clang-tidy/check_clang_tidy.py

@@ -146,6 +146,8 @@ def __init__(self, args: argparse.Namespace, extra_args: List[str]) -> None:
             self.clang_extra_args.append("-resource-dir=%s" % self.resource_dir)
 
     def read_input(self) -> None:
+        # Use a "\\?\" prefix on Windows to handle long file paths transparently:
+        # https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation
         file_name = self.input_file_name
         if platform.system() == "Windows":
             file_name = "\\\\?\\" + os.path.abspath(file_name)