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-rw-r--r--test/Sema/vfprintf-invalid-redecl.c6
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diff --git a/test/Sema/vfprintf-invalid-redecl.c b/test/Sema/vfprintf-invalid-redecl.c
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+// RUN: clang-cc %s -fsyntax-only -verify
+// PR4290
+
+// The following declaration is not compatible with vfprintf(), but make
+// sure this isn't an error: autoconf expects this to build.
+char vfprintf(); // expected-warning {{incompatible redeclaration of library function 'vfprintf'}} expected-note {{'vfprintf' is a builtin}}