1 files changed, 49 insertions, 0 deletions
diff --git a/libcxx/test/libcxx-03/vendor/apple/disable-availability.sh.cpp b/libcxx/test/libcxx-03/vendor/apple/disable-availability.sh.cpp
new file mode 100644
index 000000000000..f44b49b1ddfb
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+++ b/libcxx/test/libcxx-03/vendor/apple/disable-availability.sh.cpp
@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: stdlib=apple-libc++
+
+// This test is dependent on the code generated by the compiler, and it doesn't
+// work properly with older AppleClangs.
+// UNSUPPORTED: apple-clang-15
+
+// This test ensures that we retain a way to disable availability markup on Apple platforms
+// in order to work around Clang bug https://llvm.org/PR134151.
+//
+// Once that bug has been fixed or once we've made changes to libc++'s use of availability
+// that render that workaround unnecessary, the macro and this test can be removed.
+//
+// The test works by creating a final linked image that refers to a function marked with
+// both an availability attribute and with _LIBCPP_HIDE_FROM_ABI. We then check that this
+// generates a weak reference to the function -- without the bug, we'd expect a strong
+// reference or no reference at all instead.
+
+// First, test the test. Make sure that we do (incorrectly) produce a weak definition when we
+// don't define _LIBCPP_DISABLE_AVAILABILITY. Otherwise, something may have changed in libc++
+// and this test might not work anymore.
+// RUN: %{cxx} %s %{flags} %{compile_flags} %{link_flags} -fvisibility=hidden -fvisibility-inlines-hidden -shared -o %t.1.dylib
+// RUN: nm -m %t.1.dylib | c++filt | grep value > %t.1.symbols
+// RUN: grep weak %t.1.symbols
+
+// Now, make sure that 'weak' goes away when we define _LIBCPP_DISABLE_AVAILABILITY.
+// In fact, all references to the function might go away, so we just check that we don't emit
+// any weak reference.
+// RUN: %{cxx} %s %{flags} %{compile_flags} %{link_flags} -fvisibility=hidden -fvisibility-inlines-hidden -D_LIBCPP_DISABLE_AVAILABILITY -shared -o %t.2.dylib
+// RUN: nm -m %t.2.dylib | c++filt | grep value > %t.2.symbols
+// RUN: not grep weak %t.2.symbols
+
+#include <version>
+
+template <class T>
+struct optional {
+  T val_;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE T value() const { return val_; }
+};
+
+using PMF = int (optional<int>::*)() const;
+PMF f() { return &optional<int>::value; }