[llvm-bugs] [Bug 40094] New: lld-link ignores IMAGE_COMDAT_SELECT_* attributes

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40094

            Bug ID: 40094
           Summary: lld-link ignores IMAGE_COMDAT_SELECT_* attributes
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: COFF
          Assignee: unassignedbugs at nondot.org
          Reporter: ruiu at google.com
                CC: llvm-bugs at lists.llvm.org

lld-link currently ignores "Selection field" of a COMDAT symbol which is
described in the spec:
https://docs.microsoft.com/en-us/windows/desktop/debug/pe-format#comdat-sections-object-only

lld-link's current behavior is IMAGE_COMDAT_SELECT_ANY. So, there are two or
more COMDAT section, lld-link just picks any section from them, even though
MSVC link.exe may print out an error if their attributes are not of SELECT_ANY.

This is simply a missing feature and needs to be implemented to lld-link.

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