Add new -Wunique-enum which will warn on enums which all elements have the

same value and were initialized with literals.  Clang will warn on code like
this:

enum A {
  FIRST = 1,
  SECOND = 1
};



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157666 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/test/SemaCXX/warn-unique-enum.cpp b/test/SemaCXX/warn-unique-enum.cpp
new file mode 100644
index 0000000000..ddafc16aab
--- /dev/null
+++ b/test/SemaCXX/warn-unique-enum.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify -Wunique-enum
+enum A { A1 = 1, A2 = 1, A3 = 1 };  // expected-warning {{all elements of 'A' are initialized with literals to value 1}}
+enum { B1 = 1, B2 = 1, B3 = 1 };  // expected-warning {{all elements of anonymous enum are initialized with literals to value 1}}
+enum C { C1 = true, C2 = true}; // expected-warning {{all elements of 'C' are initialized with literals to value 1}}
+enum D { D1 = 5, D2 = 5L, D3 = 5UL, D4 = 5LL, D5 = 5ULL };  // expected-warning {{all elements of 'D' are initialized with literals to value 5}}
+
+// Don't warn on enums with less than 2 elements.
+enum E { E1 = 4 };
+enum F { F1 };
+enum G {};
+
+// Don't warn when integer literals do not initialize the elements.
+enum H { H1 = 4, H_MAX = H1, H_MIN = H1 };
+enum I { I1 = H1, I2 = 4 };
+enum J { J1 = 4, J2 = I2 };
+enum K { K1, K2, K3, K4 };