[llvm-bugs] [Bug 28248] New: [DebugInfo] Missing debug info for abstract classes with constexpr constructors with -flimited-debug-info

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28248

            Bug ID: 28248
           Summary: [DebugInfo] Missing debug info for abstract classes
                    with constexpr constructors with -flimited-debug-info
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: dblaikie at gmail.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

While working on https://llvm.org/bugs/show_bug.cgi?id=28150, I noticed that
this C++ doesn't generate any debug info describing class 'A' in C++11:

struct A {
  virtual void f() = 0;
};
struct B : A {
  virtual void f() {}
};
B b;

On Windows, Clang defaults to C++11, so we don't get this debug info. I think
the C++11 aspect has to do with A's default constructor being constexpr. Adding
a user-defined ctor to A ensures that the debug info is emitted.

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