[LLVMbugs] [Bug 15240] New: duplicate warning about deprecated destructor

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15240

            Bug ID: 15240
           Summary: duplicate warning about deprecated destructor
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This code:

struct B {
  ~B() __attribute__((deprecated));
};

struct X : public B { };

void test() {
  X *x = new X;
  delete x;
}

produces:

$ clang y.cc
y.cc:5:8: warning: '~B' is deprecated [-Wdeprecated-declarations]
struct X : public B { };
       ^
y.cc:2:3: note: '~B' declared here
  ~B() __attribute__((deprecated));
  ^
y.cc:5:8: warning: '~B' is deprecated [-Wdeprecated-declarations]
struct X : public B { };
       ^
y.cc:2:3: note: '~B' declared here
  ~B() __attribute__((deprecated));
  ^
2 warnings generated.

The issue is that the diagnostic is emitted from
MarkBaseAndMemberDestructorsReferenced, which is called twice, once from
SetCtorInitializers and once from DefineImplicitDestructor.

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