[llvm-bugs] [Bug 36777] New: Fails to emit symbols when extern "C++" used in version script for symbols with [abi:cxx11] tag

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36777

            Bug ID: 36777
           Summary: Fails to emit symbols when extern "C++" used in
                    version script for symbols with [abi:cxx11] tag
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: christopher.halse.rogers at canonical.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20082
  --> https://bugs.llvm.org/attachment.cgi?id=20082&action=edit
lld test case exhibiting the bug; dump it in tests/ELF/linkerscript

LLD fails to match symbols with the [abi:cxx11] tag to extern C++ wildcards
(see attached test case).

On inspection, this appears to be because the LLVM Itanium demangler does not
have support for the ABI tag, thus the tagged symbols don't get demangled and
so the (demangled) extern "C++" symbol directives cannot match.

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