Vendor import of clang trunk r238337:

https://llvm.org/svn/llvm-project/cfe/trunk@238337

1 files changed, 31 insertions, 0 deletions

diff --git a/test/CodeGenCXX/static-data-member-single-emission.cpp b/test/CodeGenCXX/static-data-member-single-emission.cpp
new file mode 100644
index 0000000..8c04fab
--- /dev/null
+++ b/test/CodeGenCXX/static-data-member-single-emission.cpp
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+
+template <typename T>
+struct HasStaticInit {
+static const int index;
+};
+extern "C"
+int the_count = 0;
+template <typename T>
+const int HasStaticInit<T>::index = the_count++;
+
+template <typename T> int func_tmpl1() { return HasStaticInit<T>::index; }
+template <typename T> int func_tmpl2() { return HasStaticInit<T>::index; }
+template <typename T> int func_tmpl3() { return HasStaticInit<T>::index; }
+void useit() {
+  func_tmpl1<int>();
+  func_tmpl2<int>();
+  func_tmpl3<int>();
+}
+
+// Throw in a final explicit instantiation to see that it doesn't screw things
+// up.
+template struct HasStaticInit<int>;
+
+// There should only be one entry, not 3.
+// CHECK: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }]
+
+// There should only be one update to @the_count.
+// CHECK-NOT: store i32 %{{.*}}, i32* @the_count
+// CHECK: store i32 %{{.*}}, i32* @the_count
+// CHECK-NOT: store i32 %{{.*}}, i32* @the_count