[LLVMbugs] [Bug 8752] New: Clang -Wunused should warn on unusable (member) functions.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8752

           Summary: Clang -Wunused should warn on unusable (member)
                    functions.
           Product: new-bugs
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: fvbommel at gmail.com
                CC: llvmbugs at cs.uiuc.edu


-Wunused (or -Wunused-function) should produce warnings for (member) functions
that can't possibly be used, for instance because their return value or one of
their parameters (including 'this') contains a class type declared in an
anonymous namespace. (extern "C" functions should probably be exempt)

Some examples:
=====
// From some .h file.
class Bar {
public:
  virtual void frob();
};

// From some .cpp file.
namespace {
  // Because Foo is in an anonymous namespace, newly-introduced members
  // can't be used from different translation units.
  class Foo : public Bar {
    virtual void frob() {
      // May be used externally.
    }

    int quux() {
      // Unused, but doesn't produce warning.
      return 1;
    }

    static int baz() {
      // Unused, but doesn't produce warning.
      return 2;
    }
  };

  // Unused, produces warning.
  Bar* getAnonNSBar() { return new Foo; }
}

// Unused, produces warning.
static Bar* getStaticBar() { return new Foo; }

// Unused, but doesn't produce warning.
Foo* getFoo() { return new Foo; }

// May be used externally.
Bar* getBar() { return new Foo; }
=====

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