[Bug binutils/31527] New: gdb is not working for UNC path

[zhiqxion at qti dot qualcomm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31527

            Bug ID: 31527
           Summary: gdb is not working for UNC path
           Product: binutils
           Version: 2.43 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: zhiqxion at qti dot qualcomm.com
  Target Milestone: ---

Created attachment 15426
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15426&action=edit
Support UNC path on Windows

This issue has some relationship with
https://sourceware.org/bugzilla/show_bug.cgi?id=25713

according to Microsoft's document:
https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

To specify an extended-length path,
use the "\\?\" prefix for local path. 
    For example, "\\?\D:\very long path".
To specify such a path using UNC, 
use the "\\?\UNC\" prefix for UNC path.
    "\\?\UNC\server\share",

from the change in BUG 25713, it supports local path only.

Attachment patch could fix this issue and support UNC path, can you please help
review and merge?

Thanks

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