当我想通过mingw(最后版本)使用带有CMML和SFML库的项目来编译项目时,我遇到了很多奇怪的错误(c++)。
CMake代码:
cmake_minimum_required(VERSION 3.0)
project(MLproject)
SET(CMAKE_SYSTEM_NAME Windows)
SET(CMAKE_SYSTEM_VERSION 1)
SET(CMAKE_C_COMPILER "i686-w64-mingw32-gcc")
SET(CMAKE_CXX_COMPILER "i686-w64-mingw32-g++")
SET(CMAKE_RC_COMPILER "i686-w64-mingw32-windres")
SET(CMAKE_RANLIB "i686-w64-mingw32-ranlib")
set(CMAKE_CXX_STANDARD 17)
SET(CMAKE_FIND_ROOT_PATH "/usr/i686-w64-mingw32")
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(SOURCE_EXE src/main.cpp)
set(SOURCE_GAME
src/Boss/Boss.cpp
*...*
src/Game/Game.cpp)
set(SOURCE_UI
src/UI/ScrollBar/ScrollBar.cpp)
add_library(UI SHARED ${SOURCE_UI})
add_library(Game SHARED ${SOURCE_GAME})
add_executable(main ${SOURCE_EXE})
target_link_libraries(main Game UI
sfml-graphics sfml-system sfml-windos sfml-audio)
错误:CMakeFiles/UI.dir/src/UI/ScrollBar/ScrollBar.cpp.o:ScrollBar.cpp:(.text+0x6d): undefined reference to `_imp___ZN2sf14RectangleShapeC1ERKNS_7Vector2IfEE'
CMakeFiles/UI.dir/src/UI/ScrollBar/ScrollBar.cpp.o:ScrollBar.cpp:(.text+0x399): undefined reference to `_imp___ZN2sf12RenderStates7DefaultE.....
我该如何解决?我是否因为C++版本太旧而捕获错误? (所有内容都可以在Linux上成功编译,但是我想创建跨平台)
最佳答案
错误:
CMakeFiles/UI.dir/src/UI/ScrollBar/ScrollBar.cpp.o:ScrollBar.cpp:(.text+0x6d): undefined reference to `_imp___ZN2sf14RectangleShapeC1ERKNS_7Vector2IfEE'
表示UI
库使用了一些SFML组件。但是,您仅将SFML库链接到main
可执行文件,因此该库不知道这些SFML引用的定义位置。因此,您必须将任何相关的SFML库链接到UI
目标:target_link_libraries(UI PUBLIC sfml-graphics sfml-system sfml-windos sfml-audio)
在此处使用PUBLIC
将SFML库传播到UI
目标的使用者,例如main
可执行文件。这消除了将它们显式链接到main
的需要。这是您对这些更改的完整CMake:cmake_minimum_required(VERSION 3.0)
project(MLproject)
# As commented, consider moving these calls to your toolchain file.
SET(CMAKE_SYSTEM_NAME Windows)
SET(CMAKE_SYSTEM_VERSION 1)
SET(CMAKE_C_COMPILER "i686-w64-mingw32-gcc")
SET(CMAKE_CXX_COMPILER "i686-w64-mingw32-g++")
SET(CMAKE_RC_COMPILER "i686-w64-mingw32-windres")
SET(CMAKE_RANLIB "i686-w64-mingw32-ranlib")
SET(CMAKE_FIND_ROOT_PATH "/usr/i686-w64-mingw32")
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_CXX_STANDARD 17)
set(SOURCE_EXE src/main.cpp)
set(SOURCE_GAME
src/Boss/Boss.cpp
*...*
src/Game/Game.cpp)
set(SOURCE_UI
src/UI/ScrollBar/ScrollBar.cpp)
add_library(UI SHARED ${SOURCE_UI})
# Link SFML libraries to UI.
target_link_libraries(UI PUBLIC sfml-graphics sfml-system sfml-windos sfml-audio)
add_library(Game SHARED ${SOURCE_GAME})
add_executable(main ${SOURCE_EXE})
# Link Game and UI to the executable, which propagates the SFML libraries from UI also.
target_link_libraries(main PRIVATE Game UI)
请注意,CMake顶部的许多调用都属于工具链文件(如注释所示),通常是cross-compiling。我鼓励您通读文档以确定对它的需要,并了解如何设置它。
关于c++ - 当我尝试通过mingw将CMake与SFML库一起使用来编译项目时出错,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62561063/