[llvm-bugs] [Bug 48833] New: Duplicate files with different cases added to reproducible package on Windows

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48833

            Bug ID: 48833
           Summary: Duplicate files with different cases added to
                    reproducible package on Windows
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com

On a system with a case-insensitive file system, it is possible for the same
file to appear more than once in the tar file produced by --reproduce, if the
file appears more than once in the link, but with different cases.

When unpacking that tar file, the two tar members may conflict, since they have
the same effective name. Maybe LLD should perform a case-insensitive comparison
on systems with case-insensitive paths such as Windows, when determining
whether the file is already in the archive, or otherwise test for equivalence
of two paths in some manner? (I could see an argument that it is good to have
them both in the archive, in case the tar file needs to be used on a different
OS).

Example:

C:\Work> ld.lld.exe bar.o BAR.O -o bar.elf --reproduce=repro.tar

C:\Work> tar tf repro.tar
...
repro/C/Work/TempWork/bar.o
repro/C/Work/TempWork/BAR.O

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