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db8c7e004a
We were not making any distinction between e.g. the "Apple-flavored" libc++ built from trunk and the system-provided standard library on Apple platforms. For example, any test that would be XFAILed on a back-deployment target would unexpectedly pass when run on that deployment target against the tip of trunk Apple-flavored libc++. In reality, that test would be expected to pass because we're running against the latest libc++, even if it is Apple-flavored. To solve this issue, we introduce a new feature that describes whether the Standard Library in use is the one provided by the system by default, and that notion is different from the underlying standard library flavor. We also refactor the existing Lit features to make a distinction between availability markup and the library we're running against at runtime, which otherwise limit the flexibility of what we can express in the test suite. Finally, we refactor some of the back-deployment versions that were incorrect (such as thinking that LLVM 10 was introduced in macOS 11, when in reality macOS 11 was synced with LLVM 11). Fixes #82107
54 lines
1.7 KiB
C++
54 lines
1.7 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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// UNSUPPORTED: no-exceptions
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// UNSUPPORTED: c++03
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// The <unwind.h> header provided in the SDK of older Xcodes used to provide
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// an incorrectly aligned _Unwind_Exception type on non-ARM. That causes these
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// tests to fail when running against a system libc++abi and libunwind that was
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// compiled with an incorrect definition of _Unwind_Exception.
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// XFAIL: stdlib=system && target={{.+}}-apple-macosx10.{{9|10|11|12}}
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// Test that the address of the exception object is properly aligned as required
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// by the relevant ABI
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#include <cstdint>
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#include <cassert>
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#include <__cxxabi_config.h>
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#include <unwind.h>
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struct __attribute__((aligned)) AlignedType {};
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// EHABI : 8-byte aligned
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// Itanium: Largest supported alignment for the system
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#if defined(_LIBCXXABI_ARM_EHABI)
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# define EXPECTED_ALIGNMENT 8
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#else
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# define EXPECTED_ALIGNMENT alignof(AlignedType)
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#endif
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static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT,
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"_Unwind_Exception is incorrectly aligned. This test is expected to fail");
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struct MinAligned { };
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static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, "");
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int main(int, char**) {
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for (int i=0; i < 10; ++i) {
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try {
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throw MinAligned{};
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} catch (MinAligned const& ref) {
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assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0);
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}
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}
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return 0;
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}
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