merge hasCLanguageLinkage and isExternC. Keep the shorter name.

I added hasCLanguageLinkage while fixing some language linkage bugs some
time ago so that I wouldn't have to check all users of isExternC. It turned
out to be a much longer detour than expected, but this patch finally
merges the two again. The isExternC function now implements just the
standard notion of having C language linkage.

llvm-svn: 175119

1 files changed, 19 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/linkage2.cpp b/clang/test/SemaCXX/linkage2.cpp
index d1d8d3a1560..2cee581b49c 100644
--- a/clang/test/SemaCXX/linkage2.cpp
+++ b/clang/test/SemaCXX/linkage2.cpp
@@ -106,3 +106,22 @@ extern "C" {
 extern "C++" {
   extern void test8_g();
 }
+
+extern "C" {
+  void __attribute__((overloadable)) test9_f(int c); // expected-note {{previous declaration is here}}
+}
+extern "C++" {
+  void __attribute__((overloadable)) test9_f(int c); // expected-error {{declaration of 'test9_f' has a different language linkage}}
+}
+
+extern "C" {
+  void __attribute__((overloadable)) test10_f(int);
+  void __attribute__((overloadable)) test10_f(double);
+}
+
+extern "C" {
+  void test11_f() {
+    void  __attribute__((overloadable)) test11_g(int);
+    void  __attribute__((overloadable)) test11_g(double);
+  }
+}