1beff241c3
ThreadLocal class needs to be have default visibility. Root cause is gtest uses typeinfo for the ThreadLocal class. The problem manifests When gtest/gmock are built as a shared library with libc++. When a class is used in typeinfo, it must have default visibility. There is an explanation about typeinfo and visibility here: https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html When libc++ is used with gtest in shared library mode, any tests that are compiled with -fvisibility=hidden and exercise the macro EXPECT_CALL, it results in an abort like: [ FATAL ] /usr/include/gtest/internal/gtest-port.h:1394:: Condition typeid(*base) == typeid(Derived) failed. This is because the typeinfo for ThreadLocal class is not visible. Therefore, linker failed to match it to the shared library symbol, creating a new symbol instead. This fixes https://github.com/google/googletest/issues/1207. |
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