[lld] [LLD][COFF] Make /wholearchive thin-archive member identifiers consistent (PR #145487)

[via llvm-commits]

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@@ -275,7 +275,12 @@ void LinkerDriver::addBuffer(std::unique_ptr<MemoryBuffer> mb,
 
       int memberIndex = 0;
       for (MemoryBufferRef m : getArchiveMembers(ctx, archive))
-        addArchiveBuffer(m, "<whole-archive>", filename, memberIndex++);
+        if (!archive->isThin())
+          addArchiveBuffer(m, "<whole-archive>", filename, memberIndex++);
+        else
+          // Pass empty string as archive name so that the original filename is
+          // used as the buffer identifier.
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bd1976bris wrote:

Done. I now use a common function to add thin archive members so that I don't have to duplicate this comment in two places.

https://github.com/llvm/llvm-project/pull/145487