1 files changed, 23 insertions, 0 deletions
diff --git a/test/asan/TestCases/Windows/dll_cerr.cc b/test/asan/TestCases/Windows/dll_cerr.cc
new file mode 100644
index 0000000000000..8f1a699ba801f
--- /dev/null
+++ b/test/asan/TestCases/Windows/dll_cerr.cc
@@ -0,0 +1,23 @@
+// RUN: %clang_cl_asan -O0 %p/dll_host.cc -Fe%t
+// RUN: %clang_cl_asan -LD -O0 %s -Fe%t.dll
+// RUN: %run %t %t.dll 2>&1 | FileCheck %s
+
+// Test that it works correctly even with ICF enabled.
+// RUN: %clang_cl_asan -LD -O0 %s -Fe%t.dll -link /OPT:REF /OPT:ICF
+// RUN: %run %t %t.dll 2>&1 | FileCheck %s
+
+#include <iostream>
+
+extern "C" __declspec(dllexport)
+int test_function() {
+  // Just make sure we can use cout.
+  std::cout << "All ok\n";
+// CHECK: All ok
+
+  // This line forces a declaration of some global basic_ostream internal object that
+  // calls memcpy() in its constructor.  This doesn't work if __asan_init is not
+  // called early enough.
+  std::cout << 42;
+// CHECK: 42
+  return 0;
+}