[LLVMbugs] [Bug 21280] New: operator overload resolution does too much work for enum types

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21280

            Bug ID: 21280
           Summary: operator overload resolution does too much work for
                    enum types
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

If the only operands of user-defined type are of enumeration type, and we
didn't find *any* non-builtin candidates, we don't need to bother to form the
complete list of builtin candidates and select one; we can go straight to
picking a built-in candidate. For instance:

  enum { a = 0, b = 0 };
  enum { c = a + b };

... will perform overload resolution, but doesn't need to (once we notice there
are no viable user-declared overloads of operator+).

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