From 1beff241c359fb8c98c98a661142e5b614eceb64 Mon Sep 17 00:00:00 2001 From: Manoj Gupta Date: Tue, 17 Oct 2017 11:01:39 -0700 Subject: [PATCH] googletest: Add GTEST_API_ attribute to ThreadLocal class. 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. --- googletest/include/gtest/internal/gtest-port.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/googletest/include/gtest/internal/gtest-port.h b/googletest/include/gtest/internal/gtest-port.h index 5529ba54..5e131598 100644 --- a/googletest/include/gtest/internal/gtest-port.h +++ b/googletest/include/gtest/internal/gtest-port.h @@ -2061,7 +2061,7 @@ extern "C" inline void DeleteThreadLocalValue(void* value_holder) { // Implements thread-local storage on pthreads-based systems. template -class ThreadLocal { +class GTEST_API_ ThreadLocal { public: ThreadLocal() : key_(CreateKey()), default_factory_(new DefaultValueHolderFactory()) {} @@ -2193,7 +2193,7 @@ class GTestMutexLock { typedef GTestMutexLock MutexLock; template -class ThreadLocal { +class GTEST_API_ ThreadLocal { public: ThreadLocal() : value_() {} explicit ThreadLocal(const T& value) : value_(value) {}