Fixed "fallthrough annotation does not directly precede switch label" warning in

case when [[clang::fallthrough]]; is used in a method of a local class.

llvm-svn: 178543

2 files changed, 21 insertions, 0 deletions

diff --git a/clang/lib/Sema/AnalysisBasedWarnings.cpp b/clang/lib/Sema/AnalysisBasedWarnings.cpp
index 9993b488322..00d3c47525d 100644
--- a/clang/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/clang/lib/Sema/AnalysisBasedWarnings.cpp
@@ -817,6 +817,10 @@ namespace {
       return true;
     }
 
+    // We don't want to traverse local type declarations. We analyze their
+    // methods separately.
+    bool TraverseDecl(Decl *D) { return true; }
+
   private:
 
     static const AttributedStmt *asFallThroughAttr(const Stmt *S) {
diff --git a/clang/test/SemaCXX/switch-implicit-fallthrough-regression.cpp b/clang/test/SemaCXX/switch-implicit-fallthrough-regression.cpp
new file mode 100644
index 00000000000..aec3769e00e
--- /dev/null
+++ b/clang/test/SemaCXX/switch-implicit-fallthrough-regression.cpp
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wimplicit-fallthrough %s
+
+void f() {
+  class C {
+    void f(int x) {
+      switch (x) {
+        case 0:
+          x++;
+          [[clang::fallthrough]]; // expected-no-diagnostics
+        case 1:
+          x++;
+          break;
+      }
+    }
+  };
+}
+