Googletest: Unresolved symbol when using parameterized test

[GoogleCodeExporter]

I'm using WXP, MSVC 2008 with gtest 1.5 built as DLL.

I have a parameterized testcase (TEST_P) cpp file which is also linked into 
DLL. When building the testcase, I get the following linker error:


Error   1   error LNK2001: unresolved external symbol "class 
testing::internal::Mutex testing::internal::g_linked_ptr_mutex" 
(?g_linked_ptr_mutex@internal@testing@@3VMutex@12@A)    test_Mechanic.obj

Original issue reported on code.google.com by [email protected] on 11 Jun 2010 at 7:56

[GoogleCodeExporter]

We do have tests in the test/ directory to verify this scenario and they pass.  
Are you still seeing the error?

Original comment by [email protected] on 17 Jun 2010 at 7:48

• Added labels: OpSys-Windows

[GoogleCodeExporter]

No repro.  Closing for now for lack of user feedback.

Original comment by [email protected] on 22 Jul 2010 at 4:52

• Changed state: Invalid

[louis-langholtz]

I've been seeing this crop up when building static libraries on Windows 10 with MSVC 2017. Any specific details you want on this? It may also be a problem when I'm building dynamic libraries but I'm running into other problems then that may be occluding seeing this as a problem for dynamic builds.

[NauticalMile64]

@louis-langholtz I think @GoogleCodeExporter is a bot or something. I don't know if anyone else is watching this issue...

[NauticalMile64]

@sgraham @gennadiycivil Can this issue be reopened?

[gennadiycivil]

The original issue is for MSVC 2008. This is a very old version of Visual Studio.
Does this still happen with more modern compiler?

[NauticalMile64]

Yes. I am seeing it as of VS 15.3.3 2017. The full error in my case is:

LNK2019 unresolved external symbol "class testing::internal::Mutex testing::internal::g_linked_ptr_mutex" (?g_linked_ptr_mutex@internal@testing@@3VMutex@12@A) referenced in function "public: virtual void __cdecl testing::internal::ParameterizedTestCaseInfo::RegisterTests(void)" (?RegisterTests@?$ParameterizedTestCaseInfo@VVerticalStackTest@@@internal@testing@@UEAAXXZ) UnitTests C:\pathto\PlayRho\Build\cmake-build\UnitTests\World.obj 1

[emptyVoid]

I've just stumbled upon this issue while implementing value-parameterized tests (beforehand we had no issues with linking against dynamic gtest library). And I've managed to fix it by building my tests with a preprocessor definition GTEST_LINKED_AS_SHARED_LIBRARY.

[Knitschi]

Is GTEST_LINKED_AS_SHARED_LIBRARY something that you use in your code, or an official cmake switch for GTest?

[emptyVoid]

It's a preprocessor definition that should be set while building the code that uses GTest as shared library. I've personally set it in my project's properties.

[Knitschi]

using target_compile_definitions( GMockConsumer PRIVATE -DGTEST_LINKED_AS_SHARED_LIBRARY ) fixes the compiler error, but causes a lot of
warning C4251: 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2'
warnings for me.

[emptyVoid]

If those C4251 warnings mention standard library components (such as std::basic_string), you can ignore/disable them as long as you build GTest and your own code using the same compiler and the same 'Runtime Library' settings.

[Gil-Mor]

I'm trying to build gtest 1.8 with CMake and VS2017 with Value Parameterized Tests and I get this error:

Error LNK2001 unresolved external symbol "class testing::internal::Mutex testing::internal::g_linked_ptr_mutex" (?g_linked_ptr_mutex@internal@testing@@3vmutex@12@A)

I don't want to apply the solution of setting GTEST_LINKED_AS_SHARED_LIBRARY=1 because I don't want to compile my code into a shared lib (I'm building gtest 1.8 as a shared lib). Is there a solution in this case?

My code compiles if I remove this code:

TEST_P(DerivedTests, SomeTest)
{
    ...
}

INSTANTIATE_TEST_CASE_P(JustSomeTestCaseNamePrefix,
    DerivedTests,
    ::testing::Values( custom_value_a, custom_value_b) );

Complete Code:

Class TestsBase : public Base, public ::testing::WithParamInterface< CustomType_t >
{
public:
    virtual void SetUp()
    {
        val_ = GetParam();
    }
protected:
    CustomType_t val_;

};

and Class Base is:

Class Base : public ::testing::Test 
{
    ...
};

I am building with set(BUILD_SHARED_LIBS on) and also

set(BUILD_SHARED_LIBS ON CACHE BOOL "Build shared libraries (DLLs)." FORCE)
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)

Any help would be appreciated. Thanks