1 files changed, 18 insertions, 0 deletions
diff --git a/test/Sema/builtin-redecl.cpp b/test/Sema/builtin-redecl.cpp
new file mode 100644
index 000000000000..9d1a7fff0232
--- /dev/null
+++ b/test/Sema/builtin-redecl.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify 
+// RUN: %clang_cc1 %s -fsyntax-only -verify -x c
+// RUN: %clang_cc1 %s -fsyntax-only -verify -fms-compatibility
+
+// Redeclaring library builtins is OK.
+void exit(int);
+
+// expected-error@+2 {{cannot redeclare builtin function '__builtin_va_copy'}}
+// expected-note@+1 {{'__builtin_va_copy' is a builtin with type}}
+void __builtin_va_copy(double d);
+
+// expected-error@+2 {{cannot redeclare builtin function '__builtin_va_end'}}
+// expected-note@+1 {{'__builtin_va_end' is a builtin with type}}
+void __builtin_va_end(__builtin_va_list);
+// RUN: %clang_cc1 %s -fsyntax-only -verify 
+// RUN: %clang_cc1 %s -fsyntax-only -verify -x c
+
+void __va_start(__builtin_va_list*, ...);