Add a getLanguageLinkage method to VarDecls and FunctionDecls. Use it to fix

some cases where functions with no language linkage were being treated as having
C language linkage. In particular, don't warn in

extern "C" {
  static NonPod foo();
}

Since getLanguageLinkage checks the language linkage, the linkage computation
cannot use the language linkage. Break the loop by checking just the context
in the linkage computation.

llvm-svn: 175117

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/function-extern-c.cpp b/clang/test/SemaCXX/function-extern-c.cpp
index 2a073c79fc4..a4b8400abcf 100644
--- a/clang/test/SemaCXX/function-extern-c.cpp
+++ b/clang/test/SemaCXX/function-extern-c.cpp
@@ -51,3 +51,13 @@ namespace test2 {
   };
   A f(void);  // expected-warning {{'f' has C-linkage specified, but returns user-defined type 'test2::A' which is incompatible with C}}
 }
+
+namespace test3 {
+  struct A {
+    A(const A&);
+  };
+  extern "C" {
+    // Don't warn for static functions.
+    static A f(void);
+  }
+}