在CLion中使用OpenGL的未定义参考错误 [英] Undefined Reference error using OpenGL in CLion
问题描述
因此，我正在使用freeglut尝试做一些openGL的工作，但我不断收到错误消息，指出引用未定义：
So, I am using freeglut to try to do some openGL stuff, but I keep getting errors saying that references are undefined:
"C:\Program Files (x86)\JetBrains\CLion 2016.2.1\bin\cmake\bin\cmake.exe" --build C:\Users\Nick\.CLion2016.2\system\cmake\generated\cs455opengl-9b23e7f0\9b23e7f0\Debug --target all -- -j 4
Scanning dependencies of target cs455openGL
[ 50%] Building CXX object CMakeFiles/cs455openGL.dir/main.cpp.obj
[100%] Linking CXX executable cs455openGL.exe
CMakeFiles\cs455openGL.dir/objects.a(main.cpp.obj): In function `Z4initv':
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:12: undefined reference to `glClearColor@16'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:13: undefined reference to `glMatrixMode@4'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:14: undefined reference to `glLoadIdentity@0'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:15: undefined reference to `glOrtho@48'
CMakeFiles\cs455openGL.dir/objects.a(main.cpp.obj): In function `Z7displayv':
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:20: undefined reference to `glClear@4'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:21: undefined reference to `glColor3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:22: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:23: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:24: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:25: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:26: undefined reference to `glEnd@0'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:27: undefined reference to `glFlush@0'
collect2.exe: error: ld returned 1 exit status
CMakeFiles\cs455openGL.dir\build.make:95: recipe for target 'cs455openGL.exe' failed
CMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/cs455openGL.dir/all' failed
mingw32-make.exe[2]: *** [cs455openGL.exe] Error 1
mingw32-make.exe[1]: *** [CMakeFiles/cs455openGL.dir/all] Error 2
mingw32-make.exe: *** [all] Error 2
Makefile:82: recipe for target 'all' failed
我正在将MinGW与CLion一起使用来进行此项目。我以为我一切都正确。我将适当的文件移至MinGW的include文件夹，bin文件夹以及lib文件夹中。然后，在我的CMakeLists.txt文件中输入：
I am using MinGW with CLion to do this project. I thought that I got everything correctly. I moved the appropriate files into the include folder in MinGW, as well as the bin folder, and also the lib folder. Then, I have this in my CMakeLists.txt:
cmake_minimum_required(VERSION 3.3)
project(cs455openGL)
find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
set(SOURCE_FILES main.cpp)
add_executable(cs455openGL ${SOURCE_FILES})
link_directories(${OPENGL_gl_LIBRARY})
target_link_libraries(cs455openGL libfreeglut.a libfreeglut_static.a)
我链接的库是freeglut随附的唯一库文件。我一直在互联网上寻找答案，似乎没人遇到过这个问题。
The libraries I linked were the only library files that freeglut came with. I've been scouring the internet for answers and no one seems to have run into this.
那么，我想念的是什么？ CLion在编译之前不会显示任何错误。我什至可以进入freeglut提供的头文件中的功能。为什么然后在我的程序中未定义这些函数？
So, what am I missing? CLion doesn't show any errors before it is compiled. I can even go into the functions in the header files provided by freeglut. Why then, are these functions not defined in my program?
推荐答案
这是一个链接错误，告诉您链接器确实
This is a linking error, and tells you that the linker does not find the functions defined by the OpenGL library.
您必须在<$ c中添加 $ {OPENGL_LIBRARIES} $ c> target_link_libraries 。
You have to add ${OPENGL_LIBRARIES} to target_link_libraries.
对于 glut -和其他任何库-您不应直接使用库名（ libfreeglut.a ），而应始终使用 find_package 填充的变量：
And for glut - and any other library - you should not use the library name (libfreeglut.a) directly, but always use the variables populated by the find_package:
target_link_libraries(cs455openGL ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
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