[LLVMbugs] [Bug 4673] New: Empty classes have positive DataSize

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4673

           Summary: Empty classes have positive DataSize
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: AST
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rideau3 at gmail.com
                CC: llvmbugs at cs.uiuc.edu


While implementing the __is_empty type trait, I chose to use the DataSize
member of ASTRecordLayout. As it turns out, a completely empty class ("struct
foo {};") has a DataSize equal to its Size. If the class contains a
constructor, destructor, or copy assignment operator, DataSize is 0 as
expected. Other member functions do not seem to affect this. Those three
functions are the definition of a trivial class - is that the issue?


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