[clang-tidy] Fix a template function false positive in misc-unused-using-decls check.

Summary: Ignore warning uninstantiated template function usages.

Reviewers: djasper, alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D20326

llvm-svn: 269906

1 files changed, 9 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/misc-unused-using-decls.cpp b/clang-tools-extra/test/clang-tidy/misc-unused-using-decls.cpp
index 15538a82c47..953dfe8d891 100644
--- a/clang-tools-extra/test/clang-tidy/misc-unused-using-decls.cpp
+++ b/clang-tools-extra/test/clang-tidy/misc-unused-using-decls.cpp
@@ -16,6 +16,7 @@ class I {
  public:
   static int ii;
 };
+template <typename T> class J {};
 
 class Base {
  public:
@@ -29,6 +30,7 @@ int UsedFunc() { return 1; }
 int UnusedFunc() { return 1; }
 template <typename T> int UsedTemplateFunc() { return 1; }
 template <typename T> int UnusedTemplateFunc() { return 1; }
+template <typename T> int UsedInTemplateFunc() { return 1; }
 
 class ostream {
 public:
@@ -70,6 +72,13 @@ using n::UnusedFunc; // UnusedFunc
 using n::cout;
 using n::endl;
 
+using n::UsedInTemplateFunc;
+using n::J;
+template <typename T> void Callee() {
+  J<T> j;
+  UsedInTemplateFunc<T>();
+}
+
 #define DEFINE_INT(name)        \
   namespace INT {               \
   static const int _##name = 1; \