CMake错误："；include找不到加载文件GoogleTest“；

我在将Google测试添加到CMakeLists.txt时遇到问题

问题是“错误：include找不到加载文件： 谷歌测试“

我使用以下命令安装了google测试：

sudo apt get安装libgtest dev

sudo apt get install cmake#install cmake

cd/usr/src/gtest

sudo cmake CMakeLists.txt

sudo-make

sudo cp*.a/usr/lib

这些命令是我从他那里得到的。 这是我的CMakeLists.txt：

cmake_minimum_required(VERSION 3.6.2)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 17)

project(compiler)

include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})

find_package(FLEX REQUIRED)
FLEX_TARGET(lexer src/lexer.fl ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)

find_package(GTest REQUIRED)
include(GoogleTest) <- There is a problem!
add_executable(run_tests src/tests/test.cpp src/main.h ${FLEX_lexer_OUTPUTS})
target_include_directories(run_tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(run_tests ${GTEST_LIBRARIES} stdc++fs)
#gtest_add_tests(TARGET run_tests)

add_executable(compiler src/main.h src/main.cpp src/common.h ${FLEX_lexer_OUTPUTS})

target_link_libraries($YOUR_TARGTET gtest)

add_subdirectory(googletest)

add_subdirectory(googletest)
# ...

include_directories(${CMAKE_SOURCE_DIR}/third_party/googltest/googltest/include)
# ...
add_executable(my_test...)
target_link_libraries(my_test gtest)
# ...

cmake_最低要求（3.6.2版）
集合（CMAKE_CXX_编译器clang++）
套装（CMAKE_CXX_标准17）
项目（编译器）
包括目录（${CMAKE\u CURRENT\u BINARY\u DIR}${CMAKE\u CURRENT\u SOURCE\u DIR}）
查找_包（需要FLEX）
FLEX\u目标（lexer src/lexer.fl${CMAKE\u CURRENT\u BINARY\u DIR}/lexer.cpp）
查找包（需要GTest）
include（GoogleTest）如果您已经安装了libgtest，只需在CMakeLists.txt中添加以下内容：

cmake_minimum_required(VERSION 3.6.2)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 17)

project(compiler)

include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})

find_package(FLEX REQUIRED)
FLEX_TARGET(lexer src/lexer.fl ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)

find_package(GTest REQUIRED)
include(GoogleTest) <- There is a problem!
add_executable(run_tests src/tests/test.cpp src/main.h ${FLEX_lexer_OUTPUTS})
target_include_directories(run_tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(run_tests ${GTEST_LIBRARIES} stdc++fs)
#gtest_add_tests(TARGET run_tests)

add_executable(compiler src/main.h src/main.cpp src/common.h ${FLEX_lexer_OUTPUTS})

target_link_libraries($YOUR_TARGTET gtest)

add_subdirectory(googletest)

add_subdirectory(googletest)
# ...

include_directories(${CMAKE_SOURCE_DIR}/third_party/googltest/googltest/include)
# ...
add_executable(my_test...)
target_link_libraries(my_test gtest)
# ...

但是
最好是直接将第三方库包含到项目中。我会从这条路走到这里，然后再走

当您在代码示例中涉及“apt get”时，我假设您使用的是Debian或Debian Decentants。当然，实际上，你在哪个操作系统上并不重要

将googletest源代码（请检查前面的链接）克隆到您的项目中，并将以下内容添加到主CMakeLists.txt中：

cmake_minimum_required(VERSION 3.6.2)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 17)

project(compiler)

include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})

find_package(FLEX REQUIRED)
FLEX_TARGET(lexer src/lexer.fl ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)

find_package(GTest REQUIRED)
include(GoogleTest) <- There is a problem!
add_executable(run_tests src/tests/test.cpp src/main.h ${FLEX_lexer_OUTPUTS})
target_include_directories(run_tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(run_tests ${GTEST_LIBRARIES} stdc++fs)
#gtest_add_tests(TARGET run_tests)

add_executable(compiler src/main.h src/main.cpp src/common.h ${FLEX_lexer_OUTPUTS})

target_link_libraries($YOUR_TARGTET gtest)

add_subdirectory(googletest)

add_subdirectory(googletest)
# ...

include_directories(${CMAKE_SOURCE_DIR}/third_party/googltest/googltest/include)
# ...
add_executable(my_test...)
target_link_libraries(my_test gtest)
# ...

在需要gtest的子cmake项目中添加以下内容：

include_directories(${PARENT_PATH_OF_GTEST}/googltest/googltest/include)
# ...
target_link_libraries($YOUR_TARGET gtest)

例如

假设您有一个具有以下结构的项目：

.
├── assets
│   └── ...
├── bin
│   ├── CMakeLists.txt
│   └── ...
├── CMakeLists.txt       <== Your main CmakeLists.txt
├── src
│   ├── CMakeLists.txt
│   └── ...
├── tests                <== Test cases
│   ├── CMakeLists.txt
│   └── ...
└── third_party
    ├── CMakeLists.txt
    ├── googletest       <=== gtest
    └── ...

在第三方CMakeLists.txt中：

cmake_minimum_required(VERSION 3.6.2)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 17)

project(compiler)

include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})

find_package(FLEX REQUIRED)
FLEX_TARGET(lexer src/lexer.fl ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)

find_package(GTest REQUIRED)
include(GoogleTest) <- There is a problem!
add_executable(run_tests src/tests/test.cpp src/main.h ${FLEX_lexer_OUTPUTS})
target_include_directories(run_tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(run_tests ${GTEST_LIBRARIES} stdc++fs)
#gtest_add_tests(TARGET run_tests)

add_executable(compiler src/main.h src/main.cpp src/common.h ${FLEX_lexer_OUTPUTS})

target_link_libraries($YOUR_TARGTET gtest)

add_subdirectory(googletest)

add_subdirectory(googletest)
# ...

include_directories(${CMAKE_SOURCE_DIR}/third_party/googltest/googltest/include)
# ...
add_executable(my_test...)
target_link_libraries(my_test gtest)
# ...

在tests CMakeLists.txt中：

cmake_minimum_required(VERSION 3.6.2)

set(CMAKE_CXX_COMPILER clang++)
set(CMAKE_CXX_STANDARD 17)

project(compiler)

include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})

find_package(FLEX REQUIRED)
FLEX_TARGET(lexer src/lexer.fl ${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp)

find_package(GTest REQUIRED)
include(GoogleTest) <- There is a problem!
add_executable(run_tests src/tests/test.cpp src/main.h ${FLEX_lexer_OUTPUTS})
target_include_directories(run_tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(run_tests ${GTEST_LIBRARIES} stdc++fs)
#gtest_add_tests(TARGET run_tests)

add_executable(compiler src/main.h src/main.cpp src/common.h ${FLEX_lexer_OUTPUTS})

target_link_libraries($YOUR_TARGTET gtest)

add_subdirectory(googletest)

add_subdirectory(googletest)
# ...

include_directories(${CMAKE_SOURCE_DIR}/third_party/googltest/googltest/include)
# ...
add_executable(my_test...)
target_link_libraries(my_test gtest)
# ...

一个更好的例子

下面是Jetbrains在CLion中的Gtest视频示例。由于CLion实际上基于CMake，所以它也清楚地向您展示了如何将GTest集成到CMake中

在您参考的教程中找不到一行
include（GoogleTest）
。相反，教程建议使用另一种方式链接Google测试库。