<分区>
我在将 SDL2 链接到我的项目时遇到问题，这可能是因为我是 CMake 的新手，而且我不完全知道如何使用它创建新项目。我尝试解决此问题的每次和方法都导致了以下问题之一:
- “找不到 WinMain@16”
- 多个 undefined reference 错误
- 对 `SDL_main` 的 undefined reference
我尝试使用 find_package，直接链接到文件，链接到库文件，遵循教程(例如 https://trenki2.github.io/blog/2017/06/02/using-sdl2-with-cmake/)，寻找答案(他们中的大多数人都在谈论使用 find_package，但我无法开始工作) (例如 Using SDL2 with CMake )。
项目依赖
SDL 2.0.12、CMake 3.17.0、7-Zip、mingw32-make、wget
该项目应该是跨平台的，但主要开发环境是 Windows 10。所有脚本都从根文件夹“vivaria”运行。
项目结构
vivaria/
├── build/
│ └── [cmake build files]
├── buildtools/
│ └── SDL2/SDL2-2.0.12/lib/x86 (and x64)
│ ├── SDL2.lib
│ └── SDL2main.libs
├── deploy/
├── resources/
├── scripts/
│ ├── build_windows_debug_x86.bat
│ └── install_buildtools_windows.bat
└── src/
├── CMakeLists.txt
└── vivaria.cpp
build_windows_debug_x86.bat
cmake -G "MinGW Makefiles" -S .\src\ -B .\build\ -DCMAKE_BUILD_TYPE=Debug
cd .\build\
mingw32-make
vivaria.cpp
#include <iostream>
#include "SDL.h"
int main() {
if (SDL_Init(SDL_INIT_VIDEO) != 0){
std::cout << "Hello world" << std::endl;
return 1;
}
SDL_Quit();
return 0;
}
CMakeLists.txt:对 SDL_main 的 undefined reference
cmake_minimum_required(VERSION 3.17)
project(Vivaria VERSION 1.0.0)
set(CMAKE_CXX_GLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -lmingw32")
# set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
set(INCLUDE_DIR "${CMAKE_SOURCE_DIR}/../buildtools")
set(SDL2_DIR "${INCLUDE_DIR}/SDL2/SDL2-2.0.12")
set(SDL2_INCLUDE_DIRS "${SDL2_DIR}/include")
set(CMAKE_BINARY_DIR "${CMAKE_SOURCE_DIR}/../deploy")
# Support both 32 and 64 bit builds
if (${CMAKE_SIZEOF_VOID_P} MATCHES 8)
set(SDL2_LIBRARIES "${SDL2_DIR}/lib/x64/SDL2main.lib;${SDL2_DIR}/lib/x64/SDL2.lib")
else ()
set(SDL2_LIBRARIES "${SDL2_DIR}/lib/x86/SDL2main.lib;${SDL2_DIR}/lib/x86/SDL2.lib")
endif ()
# link dependencies
include_directories(${SDL2_INCLUDE_DIRS})
link_directories(${SDL2_LIBRARIES})
# Project files and linking
set(SOURCES vivaria.cpp)
add_executable(${PROJECT_NAME} vivaria.cpp)
target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES})
控制台输出
F:\Koodit\Vivaria\build>mingw32-make
[ 50%] Linking CXX executable Vivaria.exe
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: F:/Koodit/Vivaria/src/../buildtools/SDL2/SDL2-2.0.12/lib/x86/SDL2main.lib(Win32/Release/SDL_windows_main.obj):(.text[_main_getcmdline]+0xd1): undefined reference to `SDL_main'
collect2.exe: error: ld returned 1 exit status
CMakeFiles\Vivaria.dir\build.make:104: recipe for target 'Vivaria.exe' failed
mingw32-make[2]: *** [Vivaria.exe] Error 1
CMakeFiles\Makefile2:91: recipe for target 'CMakeFiles/Vivaria.dir/all' failed
mingw32-make[1]: *** [CMakeFiles/Vivaria.dir/all] Error 2
Makefile:99: recipe for target 'all' failed
mingw32-make: *** [all] Error 2
install_buildtools_windows.bat
set SDL2=SDL2-devel-2.0.12-VC.zip
set DOWNLOAD_DIR=%cd%\buildtools
set OUTPUT_DIR=%cd%\buildtools\SDL2
wget "https://libsdl.org/release/%SDL2%" -P "%DOWNLOAD_DIR%"
7z x "%DOWNLOAD_DIR%\%SDL2%" -y -o%OUTPUT_DIR%
del /F /Q %DOWNLOAD_DIR%\%SDL2%
如您所见，我对 CMake 还是“有点”陌生，但我正在努力学习。