CMake 文件分别构建主要和测试

Question

我的目录结构如下：

main.cpp
CMakeLists.txt
src/
    some_function.h
    some_function.cpp
    some_class.h
    some_class.cpp
    CMakeLists.txt
test/
    catch.hpp
    tests.cpp 
    CMakeLists.txt

CmakeLists.txt 在项目根目录中：

cmake_minimum_required(VERSION 3.16)
set(CMAKE_CXX_STANDARD 11) # C++11

project(main)

add_subdirectory (src)

add_executable(main main.cpp)

target_link_libraries (main some_class)

CmakeLists.txt 在 src/:

add_library (some_class some_class.h some_class.cpp some_function.h some_function.cpp)

以上工作用于构建运行 main 目标。

现在我想构建运行测试。文件 tests.cpp 包括 some_function.h 和 some_class.h。但是，我不确定如何在此处添加 src/ 目录。

这是我目前在测试中的内容/（导致 some_function.h 中函数的链接错误）：

cmake_minimum_required(VERSION 3.16)
set(CMAKE_CXX_STANDARD 11) # C++11

project(tests)

set(CATCH_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
add_library(Catch INTERFACE)
target_include_directories(Catch INTERFACE ${CATCH_INCLUDE_DIR})

add_executable(tests tests.cpp)
target_link_libraries(tests Catch)

Answer 1

只是 link some_class 库目标到 tests 目标，就像你对 main 可执行目标所做的那样。

CmakeLists.txt 在项目根目录中：

cmake_minimum_required(VERSION 3.16)
set(CMAKE_CXX_STANDARD 11) # C++11

project(main)

add_subdirectory (src)
# Add the test sub-directory also.
add_subdirectory(test)

add_executable(main main.cpp)

target_link_libraries (main some_class)

CmakeLists.txt 在 test 目录中：

project(tests)

set(CATCH_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
add_library(Catch INTERFACE)
target_include_directories(Catch INTERFACE ${CATCH_INCLUDE_DIR})

add_executable(tests tests.cpp)
# Link 'some_class' here also!
target_link_libraries(tests PRIVATE some_class Catch)

Answer 2

由 add_library() 或 add_executable() 创建的普通目标具有项目范围而不是目录，这就是为什么它们的名称在项目中必须是唯一的。所以你可以“target_link” some_class 到你的目标 tests 即使目标 tests 不在 src/...

的子目录中

The <name> corresponds to the logical target name and must be globally unique within a project.

参考：https://cmake.org/cmake/help/latest/command/add_library.html#normal-libraries

这不是导入目标的情况。

The [imported] target name has scope in the directory in which it is created and below, but the GLOBAL option extends visibility. It may be referenced like any target built within the project.

参考：https://cmake.org/cmake/help/latest/command/add_library.html#imported-libraries

CMake 文件分别构建主要和测试

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