PR8455: Handle an attribute between a goto label and a variable declaration per

the GNU documentation: the attribute only appertains to the label if it is
followed by a semicolon. Based on a patch by Aaron Ballman!

llvm-svn: 194869

1 files changed, 24 insertions, 1 deletions

diff --git a/clang/test/SemaCXX/warn-unused-variables.cpp b/clang/test/SemaCXX/warn-unused-variables.cpp
index 00597f929b2..93d2f6f9563 100644
--- a/clang/test/SemaCXX/warn-unused-variables.cpp
+++ b/clang/test/SemaCXX/warn-unused-variables.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -verify %s
 template<typename T> void f() {
   T t;
   t = 17;
@@ -128,3 +128,26 @@ namespace ctor_with_cleanups {
 }
 
 #include "Inputs/warn-unused-variables.h"
+
+namespace PR8455 {
+  void f() {
+    A: // expected-warning {{unused label 'A'}}
+      __attribute__((unused)) int i; // attribute applies to variable
+    B: // attribute applies to label
+      __attribute__((unused)); int j; // expected-warning {{unused variable 'j'}}
+  }
+
+  void g() {
+    C: // unused label 'C' will not appear here because an error occurs
+      __attribute__((unused))
+      #pragma weak unused_local_static  // expected-error {{expected ';' after __attribute__}}
+      ;
+  }
+
+  void h() {
+    D: // expected-warning {{unused label 'D'}}
+      #pragma weak unused_local_static
+      __attribute__((unused))  // expected-warning {{declaration does not declare anything}}
+      ;
+  }
+}