Question

我正在尝试使用CMake构建我的项目，但是我在链接所需的库时遇到错误。我在项目的根文件夹中有这个CMakeLists.txt：

cmake_minimum_required(VERSION 2.6)
project(test)
add_subdirectory(src)

在我的src文件夹中，除了我的源文件，我还有这个CMakeLists.txt：

set (CMAKE_CXX_FLAGS "Wall -std=c++11" )
set (CMAKE_EXE_LINKER_FLAGS "-lSDL2 -lGL" )
file (GLOB SRCS *.cpp *.h )
add_executable(engine ${SRCS} )

然后我进入构建文件夹并执行cmake ..并且它运行时没有任何错误。当我执行make时，编译也会运行而没有任何错误，但是当它到达链接部分时，我会收到这些错误：

CMakeFiles/test.dir/Application.cpp.o: In function `Application::onExecute()':
Application.cpp:(.text+0x41): undefined reference to `SDL_GetTicks'
Application.cpp:(.text+0x4e): undefined reference to `SDL_GetTicks'
Application.cpp:(.text+0xd7): undefined reference to `SDL_PollEvent'
CMakeFiles/test.dir/Application.cpp.o: In function `Application::render()':
Application.cpp:(.text+0x17b): undefined reference to `glClearColor'
Application.cpp:(.text+0x185): undefined reference to `glClear'
Application.cpp:(.text+0x194): undefined reference to `SDL_GL_SwapWindow'
CMakeFiles/test.dir/Application.cpp.o: In function `Application::cleanUp()':
Application.cpp:(.text+0x1b2): undefined reference to `SDL_GL_DeleteContext'
Application.cpp:(.text+0x1c1): undefined reference to `SDL_DestroyWindow'
Application.cpp:(.text+0x1c6): undefined reference to `SDL_Quit'
CMakeFiles/test.dir/Application.cpp.o: In function `Application::initialize()':
Application.cpp:(.text+0x1de): undefined reference to `SDL_Init'
Application.cpp:(.text+0x1ea): undefined reference to `SDL_GetError'
Application.cpp:(.text+0x22b): undefined reference to `SDL_CreateWindow'
Application.cpp:(.text+0x243): undefined reference to `SDL_GetError'
Application.cpp:(.text+0x25a): undefined reference to `SDL_Quit'
Application.cpp:(.text+0x270): undefined reference to `SDL_GL_SetAttribute'
Application.cpp:(.text+0x27f): undefined reference to `SDL_GL_SetAttribute'
Application.cpp:(.text+0x28e): undefined reference to `SDL_GL_SetAttribute'
Application.cpp:(.text+0x29d): undefined reference to `SDL_GL_CreateContext'
Application.cpp:(.text+0x2af): undefined reference to `glGetString'
collect2: error: ld returned 1 exit status
make[2]: *** [src/test] Error 1
make[1]: *** [src/CMakeFiles/test.dir/all] Error 2
make: *** [all] Error 2

我的头文件中有正确的包含，我只能使用make编译和运行所以我认为我告诉CMake的链接器标志没有被传递给编译器。我该如何解决这个问题？

Answer 1

您必须使用cmake命令target_link_libraries来引用SDL库。

CMake链接器无法正常工作

1 个答案: