commit 779448684662c1fb97d2daec6fbf769ca2515a6d
author Richard Smith <richard-llvm@metafoo.co.uk> Sun Mar 02 05:58:18 2014 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> Sun Mar 02 05:58:18 2014 +0000
tree b19ea3bc584c37388126eadd15a21df44df4a1f6
parent 293a81c406a4cbc94f03a9989166534064c701e7

Add [extern_c] attribute for modules, allowing a C module to be imported within an extern "C" block in C++ code.

llvm-svn: 202615

clang/test/Modules/extern_c.cpp

diff --git a/clang/test/Modules/extern_c.cpp b/clang/test/Modules/extern_c.cpp
new file mode 100644
index 0000000..7ef4709
--- /dev/null
+++ b/clang/test/Modules/extern_c.cpp
@@ -0,0 +1,66 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DEXTERN_C
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DEXTERN_CXX
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DEXTERN_C -DEXTERN_CXX
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DEXTERN_C -DNAMESPACE
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DCXX_HEADER
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DCXX_HEADER -DEXTERN_C
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DCXX_HEADER -DEXTERN_CXX
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DCXX_HEADER -DEXTERN_C -DEXTERN_CXX
+// RUN: %clang_cc1 -fmodules -verify -fmodules-cache-path=%t -I %S/Inputs %s -DCXX_HEADER -DEXTERN_C -DNAMESPACE
+
+#ifdef NAMESPACE
+namespace M {
+#endif
+
+#ifdef EXTERN_C
+extern "C" {
+#endif
+
+#ifdef EXTERN_CXX
+extern "C++" {
+#endif
+
+#ifdef CXX_HEADER
+#define HEADER "cxx-header.h"
+#else
+#define HEADER "c-header.h"
+#endif
+
+#include HEADER
+
+#if defined(EXTERN_C) && !defined(EXTERN_CXX) && defined(CXX_HEADER)
+// expected-error@-3 {{import of C++ module 'cxx_library' appears within extern "C" language linkage specification}}
+// expected-note@-17 {{extern "C" language linkage specification begins here}}
+#elif defined(NAMESPACE)
+// expected-error-re@-6 {{import of module '{{c_library|cxx_library}}' appears within namespace 'M'}}
+// expected-note@-24 {{namespace 'M' begins here}}
+#endif
+
+#ifdef EXTERN_CXX
+}
+#endif
+
+#ifdef EXTERN_C
+}
+#endif
+
+#ifdef NAMESPACE
+}
+using namespace M;
+#endif
+
+namespace N {
+  int k = f();
+
+  extern "C" {
+    int f;
+#if !defined(CXX_HEADER)
+    // expected-error@-2 {{redefinition of 'f' as different kind of symbol}}
+    // expected-note@c-header.h:1 {{previous}}
+#endif
+  }
+}
+
+suppress_expected_no_diagnostics_error; // expected-error {{}}