Undefined reference when linking with googletest - makefile

Question

When i try to build googletest (and googlemock) 1.8.0 i get an undefined reference to MakeAndRegisterTestInfo when i try to link with libgtest.a. It works fine with version 1.7.0 with the same cmake/make setup. I guess i could use 1.7.0 but then i need to download and build gmock separately.
CMakeFiles/unittest.dir/test/test_led.cpp.o: In function `__static_initialization_and_destruction_0(int, int)':
test_led.cpp:(.text+0x23d): undefined reference to `testing::internal::MakeAndRegisterTestInfo(char const*, char const*, char const*, char const*, void const*, void (*)(), void (*)(), testing::internal::TestFactoryBase*)'
collect2: error: ld returned 1 exit status
make[2]: *** [bin/unittest] Error 1
make[1]: *** [CMakeFiles/unittest.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
Other symbols in the libgtest.a works perfectly fine (example ::testing::InitGoogleTest) but as soon as i try to add a test with the macro TEST_F i get this error.
This is my testcase setup:
#include "gtest/gtest.h"
namespace {
// The fixture for testing (used by TEST_F).
class Foo : public ::testing::Test {
protected:
Foo();
virtual ~Foo() {};
virtual void SetUp();
virtual void TearDown();
};
Foo::Foo() {
};
void Foo::SetUp()
{
};
void Foo::TearDown()
{
};
TEST_F(Foo, Init) {
};
} // namespace
int main(int argc, char **argv)
{
::testing::InitGoogleTest(&argc, argv);
int ret = RUN_ALL_TESTS();
return ret;
}
Cmake google test snippet:
It downloads from a local folder. It builds and i get a libgtest.a file.
### Unit test ###
# Google test
ExternalProject_Add(EXT_googletest
PREFIX ${CMAKE_CURRENT_BINARY_DIR}
DOWNLOAD_COMMAND ""
SOURCE_DIR ${CMAKE_SOURCE_DIR}/../external/googletest
BUILD_COMMAND make all
# Disable install step
INSTALL_COMMAND "")
# Create a libgtest target to be used as a dependency by test programs
set(LIBGTEST_STATIC ${CMAKE_CURRENT_BINARY_DIR}/.../googlemock/gtest/libgtest.a)
add_executable(unittest
"test/test_foo.cpp")
target_link_libraries(unittest main_app_lib
${LIBGTEST_STATIC}
${CMAKE_THREAD_LIBS_INIT})
NM output libgtest.a 1.8.0
user#system$ nm .../libgtest.a |grep MakeAndRegisterTestInfo
000000000000743a T _ZN7testing8internal23MakeAndRegisterTestInfoEPKcS2_S2_S2_NS0_12CodeLocationEPKvPFvvES7_PNS0_15TestFactoryBaseE
NM output libgtest.a 1.7.0 (working file)
user#system$ nm .../libgtest.a |grep MakeAndRegisterTestInfo
0000000000005968 T _ZN7testing8internal23MakeAndRegisterTestInfoEPKcS2_S2_S2_PKvPFvvES6_PNS0_15TestFactoryBaseE
Solved:
There was an old version of google test installed on build machine which headers were used by cmake.

Answer 1

#user1178014 answered his own question but since there are no posted answers I am writing it up:
If you downloaded the gtest source directly and used the make install from the downloaded gtest repository it may have installed header files under /usr/local/include/gtest. If you later use apt-get to install the libgtest-dev debian package it installs the header files under /usr/include/gtest. If the version installed from the debian package is newer, your Makefile can pick up the older header files from /usr/include and give you link errors even though you
are correctly linking the new libgtest.a archive.
The solution is to look for /usr/local/include/gtest and /usr/include/gtest to see if they both exist. If they do then delete the older directory. If /usr/include/gtest is the older directory, you may want to remove it by uninstalling the libgtest-dev package.