1 files changed, 51 insertions, 0 deletions
diff --git a/clang/test/Sema/no-builtin.cpp b/clang/test/Sema/no-builtin.cpp
new file mode 100644
index 00000000000..40781abd303
--- /dev/null
+++ b/clang/test/Sema/no-builtin.cpp
@@ -0,0 +1,51 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -verify %s
+
+/// Prevent use of all builtins.
+void valid_attribute_all_1() __attribute__((no_builtin)) {}
+void valid_attribute_all_2() __attribute__((no_builtin())) {}
+
+/// Prevent use of specific builtins.
+void valid_attribute_function() __attribute__((no_builtin("memcpy"))) {}
+void valid_attribute_functions() __attribute__((no_builtin("memcpy"))) __attribute__((no_builtin("memcmp"))) {}
+
+/// Many times the same builtin is fine.
+void many_attribute_function_1() __attribute__((no_builtin)) __attribute__((no_builtin)) {}
+void many_attribute_function_2() __attribute__((no_builtin("memcpy"))) __attribute__((no_builtin("memcpy"))) {}
+void many_attribute_function_3() __attribute__((no_builtin("memcpy", "memcpy"))) {}
+void many_attribute_function_4() __attribute__((no_builtin("memcpy", "memcpy"))) __attribute__((no_builtin("memcpy"))) {}
+
+/// Invalid builtin name.
+void invalid_builtin() __attribute__((no_builtin("not_a_builtin"))) {}
+// expected-warning@-1 {{'not_a_builtin' is not a valid builtin name for no_builtin}}
+
+/// Can't use bare no_builtin with a named one.
+void wildcard_and_functionname() __attribute__((no_builtin)) __attribute__((no_builtin("memcpy"))) {}
+// expected-error@-1 {{empty no_builtin cannot be composed with named ones}}
+
+/// Can't attach attribute to a variable.
+int __attribute__((no_builtin)) variable;
+// expected-warning@-1 {{'no_builtin' attribute only applies to functions}}
+
+/// Can't attach attribute to a declaration.
+void nobuiltin_on_declaration() __attribute__((no_builtin));
+// expected-error@-1 {{no_builtin attribute is permitted on definitions only}}
+
+struct S {
+  /// Can't attach attribute to a defaulted function,
+  S()
+  __attribute__((no_builtin)) = default;
+  // expected-error@-1 {{no_builtin attribute has no effect on defaulted or deleted functions}}
+
+  /// Can't attach attribute to a deleted function,
+  S(const S &)
+  __attribute__((no_builtin)) = delete;
+  // expected-error@-1 {{no_builtin attribute has no effect on defaulted or deleted functions}}
+
+  void whatever() __attribute__((no_builtin("memcpy")));
+  // expected-error@-1 {{no_builtin attribute is permitted on definitions only}}
+};
+
+/// Can't attach attribute to an aliased function.
+void alised_function() {}
+void aliasing_function() __attribute__((no_builtin)) __attribute__((alias("alised_function")));
+// expected-error@-1 {{no_builtin attribute is permitted on definitions only}}