Allow dllimport/dllexport on inline functions and adjust the linkage.

This is a step towards handling these attributes on classes (PR11170).

Differential Revision: http://reviews.llvm.org/D3772

llvm-svn: 208925
diff --git a/clang/test/CodeGenCXX/dllimport.cpp b/clang/test/CodeGenCXX/dllimport.cpp
new file mode 100644
index 0000000..d8e58f7
--- /dev/null
+++ b/clang/test/CodeGenCXX/dllimport.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -triple i686-pc-win32 -x c++ -O2 -disable-llvm-optzns -emit-llvm < %s | FileCheck %s
+
+#define DLLIMPORT __declspec(dllimport)
+
+void DLLIMPORT a();
+// CHECK-DAG: declare dllimport void @"\01?a@@YAXXZ"()
+
+inline void DLLIMPORT b() {}
+// CHECK-DAG: define available_externally dllimport void @"\01?b@@YAXXZ"()
+
+template <typename T> inline void c() {} // FIXME: MSVC accepts this without 'inline' too.
+template void DLLIMPORT c<int>();
+// CHECK-DAG: define available_externally dllimport void @"\01??$c@H@@YAXXZ"()
+
+struct S {
+  void DLLIMPORT a() {}
+  // CHECK-DAG: define available_externally dllimport x86_thiscallcc void @"\01?a@S@@QAEXXZ"
+};
+
+void user(S* s) {
+  a();
+  b();
+  c<int>();
+  s->a();
+}