[llvm-bugs] [Bug 45661] New: llvm-ar works wrong with thin archives containing object files of same name

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45661

            Bug ID: 45661
           Summary: llvm-ar works wrong with thin archives containing
                    object files of same name
           Product: lld
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: qwertytmp1 at gmail.com
                CC: llvm-bugs at lists.llvm.org, smithp352 at googlemail.com

For simplicity, I've prepared several bash files designed to be some sort of
PoC.

0.prepare_object_files.sh
```
#!/bin/bash

mkdir -p keyboard
mkdir -p mouse

touch keyboard/click.o
touch mouse/click.o

```

1.create_thin_archive.sh
```
#!/bin/bash

# set 1st argument as binutil's ar or llvm-ar
AR="$1"

rm -f mouse/built-in.o
rm -f keyboard/built-in.o
rm -f built-in.o

$AR -rcST mouse/built-in.o mouse/click.o \
&& \
$AR -rcST keyboard/built-in.o keyboard/click.o \
&& \
$AR -rcST built-in.o mouse/built-in.o keyboard/built-in.o \
&& \
cat built-in.o
```

To prepare environment (.o files and folders) run:
```
./0.prepare_object_files.sh
```

After this, run PoC with binutil's ar:
```
./1.create_thin_archive.sh ar
```

we'll get following output:
```
!<thin>

//                                              34        `
mouse/click.o/
keyboard/click.o/
...
```


After we run PoC with llvm-ar:
```
./1.create_thin_archive.sh llvm-ar
```

we'll get following output:
```
!<thin>

//                                              18        `
click.o/
click.o/
...
```

And here is a problem. 
Both click.o files located at the same directory level inside of thin archive,
generated by llvm-ar.

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