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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.
8 lines
297 B
CMake
8 lines
297 B
CMake
if(NOT CONFIG_IDF_TARGET_LINUX)
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if(CONFIG_COMPILER_CXX_ATOMIC_LOCK_POLICY)
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idf_toolchain_add_flags(CXX_COMPILE_OPTIONS "-D_GLIBCXX_HAVE_ATOMIC_LOCK_POLICY=1")
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else()
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idf_toolchain_remove_flags(CXX_COMPILE_OPTIONS "-D_GLIBCXX_HAVE_ATOMIC_LOCK_POLICY=1")
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endif()
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endif()
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