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b3ae652f21
libstdc++ selects between a lock-free and a mutex-based policy for std::shared_ptr reference counting based on this macro. Enabling this option forces the lock-free policy, which avoids pulling in the mutex-based implementation and can reduce code size. Note: the lock-free policy avoids embedding a mutex in each control block, saving about 88 bytes per shared_ptr, and improves performance by using atomic operations instead of mutex locking. Note: this option changes the ABI of libstdc++ atomic/shared_ptr helpers. It can be incompatible when linking against prebuilt libraries that were compiled without it, leading to link errors or undefined runtime behavior. Only enable it if all C++ objects and libraries in the build use the same setting.
26 lines
1.2 KiB
Python
26 lines
1.2 KiB
Python
# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import pytest
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from test_build_system_helpers import IdfPyFunc
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CXX_ATOMIC_POLICY_TEST_APP = 'components/cxx/test_apps/atomic_lock_policy'
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@pytest.mark.test_app_copy(CXX_ATOMIC_POLICY_TEST_APP)
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@pytest.mark.usefixtures('test_app_copy')
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def test_cxx_atomic_policy_checking(idf_py: IdfPyFunc) -> None:
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"""
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Build the atomic_lock_policy test app with -DTEST_INVALID_LOCK_POLICIES=1.
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CONFIG_COMPILER_CXX_ATOMIC_LOCK_POLICY adds -D_GLIBCXX_HAVE_ATOMIC_LOCK_POLICY=1
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to all C++ files, but TEST_INVALID_LOCK_POLICIES undefines it for one
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translation unit. The linked executable therefore contains mixed
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__gnu_cxx::_Lock_policy instantiations, and the cxx post-build hook
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(check_cxx_atomic_policy.cmake) must fail the build.
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"""
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ret = idf_py('-DIDF_TARGET=esp32c5', '-DTEST_INVALID_LOCK_POLICIES=1', 'build', check=False)
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assert ret.returncode != 0, 'Build must fail when atomic lock policies are mixed'
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assert 'Mixed libstdc++ atomic lock policies detected' in (ret.stdout + ret.stderr), (
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'Expected the cxx post-build hook to report mixed atomic lock policies'
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)
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