用cmake构建库

Question

我为打扰你们而道歉,但我对cmake有一点编译问题.

我有一个CMakeLists.txt文件,我用它来构建一个测试可执行文件和一个共享库.它们都依赖于另一个库(SFML).

我在MinGW的窗口上使用cmake.

我知道我正在构建的lib的名称与sfml有点混淆,但它应该是一个SFML包装器,所以,我找不到更好的名字!

这里是CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
project(projectName)

set(EXECUTABLE_NAME testSFML)
set(LIBRARY_NAME    SFMLwindow)

set(EXECUTABLE_OUTPUT_PATH ${CMAKE_CURRENT_SOURCE_DIR}/bin/)

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include /
${CMAKE_CURRENT_SOURCE_DIR}/../../include
)

link_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../lib/)

file(
    GLOB_RECURSE
    SRC_FILES
    src/*
)

file(
    GLOB_RECURSE
    INCLUDE_FILES
    include/*
)

add_executable(
${EXECUTABLE_NAME}
main.cpp
${SRC_FILES}
${INCLUDE_FILES}
)

target_link_libraries(
    ${EXECUTABLE_NAME}
    sfml-main
    sfml-system
    sfml-window
)


add_library(
${LIBRARY_NAME}
SHARED
${SRC_FILES}
)

我在终端得到了什么:

"C:\MinGW\bin\mingw32-make.exe" 
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/iksemel/docs/WorkBench/programming/projets/TestSFML/cmake
Linking CXX shared library libSFMLwindow.dll
Creating library file: libSFMLwindow.dll.a
CMakeFiles\SFMLwindow.dir/objects.a(SFMLWindow.cpp.obj):SFMLWindow.cpp:(.text+0x59):undefined reference to `_imp___ZN2sf9VideoModeC1Ejjj'
CMakeFiles\SFMLwindow.dir/objects.a(SFMLWindow.cpp.obj):SFMLWindow.cpp:(.text+0xda): undefined reference to `_imp___ZN2sf6WindowC1ENS_9VideoModeERKSsjRKNS_15ContextSettingsE'
CMakeFiles\SFMLwindow.dir/objects.a(SFMLWindow.cpp.obj):SFMLWindow.cpp:(.text+0x163): undefined reference to `_imp___ZN2sf6Window5closeEv'
CMakeFiles\SFMLwindow.dir/objects.a(SFMLWindow.cpp.obj):SFMLWindow.cpp:(.text+0x1bd): undefined reference to `_imp___ZN2sf6Window9pollEventERNS_5EventE'
CMakeFiles\SFMLwindow.dir/objects.a(SFMLWindow.cpp.obj):SFMLWindow.cpp:(.text+0x1d8): undefined reference to `_imp___ZN2sf6Window7displayEv'
collect2: ld a retourné 1 code d'état d'exécution
mingw32-make.exe[2]: *** [libSFMLwindow.dll] Error 1
mingw32-make.exe[1]: *** [CMakeFiles/SFMLwindow.dir/all] Error 2
mingw32-make.exe: *** [all] Error 2

如果有人知道发生了什么,我会非常感激!

Answer 1

猜测,您的SFMLwindow库需要链接到部分或全部sfml-main,sfml-system,sfml-window.

您可以尝试将CMakeLists.txt的结尾更改为:

add_library(
    ${LIBRARY_NAME}
    SHARED
    ${SRC_FILES}
    ${INCLUDE_FILES}
)

add_executable(
    ${EXECUTABLE_NAME}
    main.cpp
)

target_link_libraries(
    ${LIBRARY_NAME}
    sfml-main
    sfml-system
    sfml-window
)

target_link_libraries(
    ${EXECUTABLE_NAME}
    ${LIBRARY_NAME}
)

另外,file(GLOB_RECURSE...作为一种收集来源列表的方式,通常不赞成.来自以下文档file:

我们不建议使用GLOB从源树中收集源文件列表.如果在添加或删除源时没有更改CMakeLists.txt文件,则生成的构建系统无法知道何时请求CMake重新生成.

此外,在这种情况下find_library应该优先考虑link_directories.来自以下文档link_directories:

请注意,此命令很少需要.find_package()和find_library()返回的库位置是绝对路径.将这些绝对库文件路径直接传递给target_link_libraries()命令.CMake将确保链接器找到它们.