[-Wunreachable-code] add a specialized diagnostic for unreachable increment expressions of loops.

llvm-svn: 204430

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-unreachable.cpp b/clang/test/SemaCXX/warn-unreachable.cpp
index eab8d8e6b97..8acaf428551 100644
--- a/clang/test/SemaCXX/warn-unreachable.cpp
+++ b/clang/test/SemaCXX/warn-unreachable.cpp
@@ -282,3 +282,15 @@ void test_static_class_var(Frodo &F) {
     somethingToCall(); // no-warning
 }
 
+void test_unreachable_for_null_increment() {
+  for (unsigned i = 0; i < 10 ; ) // no-warning
+    break;
+}
+
+void test_unreachable_forrange_increment() {
+  int x[10] = { 0 };
+  for (auto i : x) { // expected-warning {{loop will run at most once (loop increment never executed)}}
+    break;
+  }
+}
+