Googletest C++ unit testing linking error [duplicate] - c++

Question

This question already has answers here:
What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Closed 6 years ago.
I'm a beginner C++ programmer. I'm trying Google Test in Visual Studio 2012 and have problem starting a demo source code I got from internet.
int CompareChar(char* ch1, char* ch2)
{
if (ch1 == NULL || ch2 == NULL)
return 88;
return strcmp(ch1, ch2);
}
TEST(CompareCharTest, InputChar) {
// Expect equal
EXPECT_EQ(0, CompareChar("hello", "hello"));
// Expect not equal
EXPECT_NE(0, CompareChar("hello", "world"));
}
TEST(SampleClassTest, InputNumber) {
SampleClass sample(10);
EXPECT_EQ(1, sample.CompareValue(10)); // Expect equal
}
int _tmain(int argc, _TCHAR* argv[])
{
::testing::InitGoogleTest(&argc, argv);
int i = RUN_ALL_TESTS();
getchar();
return i;
}
So, when I try to build the code, it generates dozens of linking errors which I couldn't sort out. I tried to include .lib files in the property of the project but couldn't solve it.
The error:
>1>------ Build started: Project: GTestSample, Configuration: Release Win32 ------
>1> stdafx.cpp
1> GTestSample.cpp
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall testing::Message::GetString(void)const " (?GetString#Message#testing##QBE?AV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: __thiscall testing::Message::Message(void)" (??0Message#testing##QAE#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: static class testing::UnitTest * __cdecl testing::UnitTest::GetInstance(void)" (?GetInstance#UnitTest#testing##SAPAV12#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: int __thiscall testing::UnitTest::Run(void)" (?Run#UnitTest#testing##QAEHXZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "protected: __thiscall testing::Test::Test(void)" (??0Test#testing##IAE#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall testing::Test::~Test(void)" (??1Test#testing##UAE#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "class testing::TestInfo * __cdecl testing::internal::MakeAndRegisterTestInfo(char const *,char const *,char const *,char const *,void const *,void (__cdecl*)(void),void (__cdecl*)(void),class testing::internal::TestFactoryBase *)" (?MakeAndRegisterTestInfo#internal#testing##YAPAVTestInfo#2#PBD000PBXP6AXXZ2PAVTestFactoryBase#12##Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "void const * __cdecl testing::internal::GetTestTypeId(void)" (?GetTestTypeId#internal#testing##YAPBXXZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: void __thiscall testing::internal::AssertHelper::operator=(class testing::Message const &)const " (??4AssertHelper#internal#testing##QBEXABVMessage#2##Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: __thiscall testing::internal::AssertHelper::AssertHelper(enum testing::TestPartResult::Type,char const *,int,char const *)" (??0AssertHelper#internal#testing##QAE#W4Type#TestPartResult#2#PBDH1#Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: __thiscall testing::internal::AssertHelper::~AssertHelper(void)" (??1AssertHelper#internal#testing##QAE#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "void __cdecl testing::InitGoogleTest(int *,wchar_t * *)" (?InitGoogleTest#testing##YAXPAHPAPA_W#Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "bool __cdecl testing::internal::IsTrue(bool)" (?IsTrue#internal#testing##YA_N_N#Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "class testing::AssertionResult __cdecl testing::AssertionSuccess(void)" (?AssertionSuccess#testing##YA?AVAssertionResult#1#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "public: __thiscall testing::AssertionResult::AssertionResult(class testing::AssertionResult const &)" (??0AssertionResult#testing##QAE#ABV01##Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "class testing::AssertionResult __cdecl testing::AssertionFailure(void)" (?AssertionFailure#testing##YA?AVAssertionResult#1#XZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "class testing::AssertionResult __cdecl testing::internal::EqFailure(char const *,char const *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,bool)" (?EqFailure#internal#testing##YA?AVAssertionResult#2#PBD0ABV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##1_N#Z)
1>GTestSample.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall testing::Test::SetUp(void)" (?SetUp#Test#testing##MAEXXZ)
1>GTestSample.obj : error LNK2001: unresolved external symbol "protected: virtual void __thiscall testing::Test::TearDown(void)" (?TearDown#Test#testing##MAEXXZ)
1>D:\VisualStudioProj\GTestSample\Release\GTestSample.exe : fatal error LNK1120: 19 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

I had the same issue. Make sure that in your test project's properties, you go into Project->Linker->General settings and add the msvc/Release directory to Additional Directories. Furthermore, under Linker->Input, add gtest.lib into Additional Dependencies. Then you should be good to go!

Answer 2

I know this post is old, but it could still help anyone out. A quick Google search for "LNK2019 unresolved external symbol "bool __cdecl testing::internal::IsTrue ..." as stated above gives this stackoverflow and several sites with the same answers.
For those that tried Oleg Vaskevich solution or similar and failed, try this. If you are using Visual Studio, C/C++ -> General -> Additional Include Directories and make sure that the gtest is included. Secondly, (which will likely be your answer), copy the gtest-all.cc in the gtest/scr/ folder and paste in your project directory (wherever your .cpp/.h files are saved), then go back to Visual Studio and include it in your project. You will have to unhide files/folders to view it. 'Include to project'.
I know that copying and pasting this isn't ideal for every project, but the point is to at least get it working and making sure this is the true problem and not something else.
Because I never complied my version, I never had any lib files to begin with.