derek.holloway
7502bf64a4
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46 lines
2.2 KiB
C++
46 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: stdlib=apple-libc++
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// This test ensures that we retain a way to disable availability markup on Apple platforms
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// in order to work around Clang bug https://llvm.org/PR134151.
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//
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// Once that bug has been fixed or once we've made changes to libc++'s use of availability
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// that render that workaround unnecessary, the macro and this test can be removed.
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//
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// The test works by creating a final linked image that refers to a function marked with
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// both an availability attribute and with _LIBCPP_HIDE_FROM_ABI. We then check that this
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// generates a weak reference to the function -- without the bug, we'd expect a strong
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// reference or no reference at all instead.
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// First, test the test. Make sure that we do (incorrectly) produce a weak definition when we
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// don't define _LIBCPP_DISABLE_AVAILABILITY. Otherwise, something may have changed in libc++
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// and this test might not work anymore.
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// RUN: %{cxx} %s %{flags} %{compile_flags} %{link_flags} -fvisibility=hidden -fvisibility-inlines-hidden -shared -o %t.1.dylib
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// RUN: nm -m %t.1.dylib | c++filt | grep value > %t.1.symbols
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// RUN: grep weak %t.1.symbols
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// Now, make sure that 'weak' goes away when we define _LIBCPP_DISABLE_AVAILABILITY.
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// In fact, all references to the function might go away, so we just check that we don't emit
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// any weak reference.
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// RUN: %{cxx} %s %{flags} %{compile_flags} %{link_flags} -fvisibility=hidden -fvisibility-inlines-hidden -D_LIBCPP_DISABLE_AVAILABILITY -shared -o %t.2.dylib
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// RUN: nm -m %t.2.dylib | c++filt | grep value > %t.2.symbols
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// RUN: not grep weak %t.2.symbols
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#include <version>
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template <class T>
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struct optional {
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T val_;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_INTRODUCED_IN_LLVM_11_ATTRIBUTE T value() const { return val_; }
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};
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using PMF = int (optional<int>::*)() const;
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PMF f() { return &optional<int>::value; }
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