1 files changed, 30 insertions, 0 deletions
diff --git a/test/CXX/drs/dr11xx.cpp b/test/CXX/drs/dr11xx.cpp
new file mode 100644
index 0000000000000..81fbc1e3ef1b4
--- /dev/null
+++ b/test/CXX/drs/dr11xx.cpp
@@ -0,0 +1,30 @@
+// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++2a %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+
+namespace dr1113 { // dr1113: partial
+  namespace named {
+    extern int a; // expected-note {{previous}}
+    static int a; // expected-error {{static declaration of 'a' follows non-static}}
+  }
+  namespace {
+    extern int a;
+    static int a; // ok, both declarations have internal linkage
+    int b = a;
+  }
+
+  // FIXME: Per DR1113 and DR4, this is ill-formed due to ambiguity: the second
+  // 'f' has internal linkage, and so does not have C language linkage, so is
+  // not a redeclaration of the first 'f'.
+  //
+  // To avoid a breaking change here, Clang ignores the "internal linkage" effect
+  // of anonymous namespaces on declarations declared within an 'extern "C"'
+  // linkage-specification.
+  extern "C" void f();
+  namespace {
+    extern "C" void f();
+  }
+  void g() { f(); }
+}