无法将 GTest 中的类与 CMake 链接

我正在尝试使用 CMake 将 GTests 合并到我的项目中。我按照此说明进行操作，但出现以下错误：

Undefined symbols for architecture x86_64:
"SomeClass::someMethod()", referenced from:
someMethod_TrivialTest_Test::TestBody() in SomeClassTest.cpp.o
ld: symbol(s) not found for architecture x86_64

这是我的CMake文件：

cmake_minimum_required(VERSION 3.11)
project (someProject)
set(CMAKE_CXX_STANDARD 17)
#Include headers
include_directories("../include")
#Add source files
file(GLOB SOURCES "src/*.cpp")
add_executable(someProject ${SOURCES})

################################
# GTest
################################
# Download and unpack googletest at configure time
configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "CMake step for googletest failed: ${result}")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} --build .
RESULT_VARIABLE result
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download )
if(result)
message(FATAL_ERROR "Build step for googletest failed: ${result}")
endif()
# Prevent overriding the parent project's compiler/linker
# settings on Windows
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Add googletest directly to our build. This defines
# the gtest and gtest_main targets.
add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
${CMAKE_BINARY_DIR}/googletest-build
EXCLUDE_FROM_ALL)
# The gtest/gtest_main targets carry header search path
# dependencies automatically when using CMake 2.8.11 or
# later. Otherwise we have to add them here ourselves.
if (CMAKE_VERSION VERSION_LESS 2.8.11)
include_directories("${gtest_SOURCE_DIR}/include")
endif()
# Add test cpp file
add_executable( someTests ./test/SomeClassTest.cpp)
# Link test executable against gtest & gtest_main
target_link_libraries(someTests gtest gtest_main)
add_test( someTests someTests )

我的项目结构(CMakeLists.txt.in 用于下载从上述说明添加的 GTest 库(：

.
├── CMakeLists.txt
├── CMakeLists.txt.in
├── include
│   └──SomeClass.hpp
├── src
│   ├── Main.cpp
│   └── SomeClass.cpp
└── tests
└── SomeClassTest.cpp

如果我手动创建和链接对象，它可以工作。

g++ -c ./src/SomeClass.cpp
g++ -c ./test/SomeClassTest.cpp
g++ SomeClassTest.o SomeClass.o ./build/googletest-build/googlemock/gtest/CMakeFiles/gtest.dir/src/gtest-all.cc.o  -o myTests

测试类的对象似乎在那里：

./build/CMakeFiles/someTests.dir/test/SomeClassTest.cpp.o

但是 someProject 对象的目录是空的：

./build/CMakeFiles/someProject.dir/src/

所以我在 CMake 文件中缺少一些东西，并且它没有正确链接。到目前为止，我能找到的所有答案都与指定target_link_libraries有关，但我不确定这是否是这里的问题。我是CMake和链接问题的新手。任何建议将不胜感激！