https://llvm.org/bugs/show_bug.cgi?id=24097

            Bug ID: 24097
           Summary: clang produces hidden symbol when gcc produces a
                    default one
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
    Classification: Unclassified

Created attachment 14578
  --> https://llvm.org/bugs/attachment.cgi?id=14578&action=edit
testcase

Compiling the attached testcase with gcc -fvisibility=hidden produces

 72: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND
_ZThn16_N17SyncMessageFilter4SendEP7Message

and with clang -O0 too, but use -O1 and you get

define available_externally hidden zeroext i1
@_ZThn16_N17SyncMessageFilter4SendEP7Message(

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