CMake不链接目标文件[关闭]

Question

您好，我正在尝试使用 CMake 构建我的 SFML 项目，但是当我尝试使用多个源文件时，CMake 不会链接目标文件

这是我的 CMakeLists.txt：

cmake_minimum_required(VERSION 3.20)
set(CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

project(PolygonPoints)
find_package(SFML 2.5.1 COMPONENTS graphics window system audio REQUIRED)
file(
    GLOB
    SOURCES
    "src/*.hpp"
    "src/*.cpp"
)

add_executable(PolygonPoints ${SOURCES})
target_link_libraries(PolygonPoints sfml-graphics sfml-window sfml-system sfml-audio)
target_include_directories(PolygonPoints PRIVATE include)

这是我的项目结构：

PolygonPoints/
    src/
        main.cpp
        point.cpp
    include/
        point.hpp
    build/
        (...)
    CMakeLists.txt
    (...)

这是我得到的错误：

bayram@milkyway ~/Projects/PolygonPoints/build (main)> cmake .. && make && ./PolygonPoints
-- Found SFML 2.5.1 in /usr/lib64/cmake/SFML
-- Configuring done
-- Generating done
-- Build files have been written to: /home/bayram/Projects/PolygonPoints/build
Consolidate compiler generated dependencies of target PolygonPoints
[ 33%] Linking CXX executable PolygonPoints
/usr/bin/ld: CMakeFiles/PolygonPoints.dir/src/main.cpp.o: in function `main':
main.cpp:(.text+0x173): undefined reference to `Point::Point(sf::Vector2<int>, sf::Vector2<int>)'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/PolygonPoints.dir/build.make:117: PolygonPoints] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/PolygonPoints.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

Answer 1

这里要小心：

file(
    GLOB
    SOURCES
    "src/*.hpp"
    "src/*.cpp"
)

据我了解，这仅在 cmake 项目配置期间运行，因此如果您稍后添加了 .cpp 文件，它将不会包含在构建中。您最好在可执行文件中明确列出您的文件，如下所示：

add_executable(PolygonPoints 
    src/main.cpp
    src/point.cpp
)

现在添加文件时，您必须编辑 add_executable，这会导致 cmake 重新评估自身并重新生成构建/制作文件（取决于您的生成器），因此文件始终按预期编译。