C ++ OpenGL未定义引用 [英] c++ OpenGL undefined references

问题描述

我正在尝试通过遵循教程来使OpenGL在使用c ++的Linux机器上运行.

我正在使用Ubuntu 12.04 LTS.我有两个由sudo apt-get install package-name1 package-name2

I am using Ubuntu 12.04 LTS. I have both packages freeglut3-dev and mesa-common-dev which I installed by sudo apt-get install package-name1 package-name2

只需确保我进入了推荐的目录/usr/include/GL，并用ls列出了文件:

Just to be sure I went to the recommended directory /usr/include/GL and listed the files with ls:

freeglut_ext.h  freeglut.h  freeglut_std.h  glext.h  gl.h  gl_mangle.h  glu.h  glu_mangle.h  glut.h  glxext.h  glx.h  glx_mangle.h  internal

我注意到我确实有gl.h和glut.h，所以我按照教程的建议测试了示例程序.我下载了zip文件，将文件解压缩到同一目录，然后运行make实用程序.这是运行make

I noted that I do have gl.h and glut.h so I tested the sample program as recommended by the tutorial. I downloaded the zip file, unzipped the files into the same directory and then ran the make utility. Here is some output after running make

g++ -Wall -o cube main.cpp imageloader.cpp -lglut
imageloader.cpp: In function ‘Image* loadBMP(const char*)’:
imageloader.cpp:141:2: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
/tmp/ccWT2wvp.o:main.cpp:function loadTexture(Image*): error: undefined reference to 'glGenTextures'
/tmp/ccWT2wvp.o:main.cpp:function loadTexture(Image*): error: undefined reference to 'glBindTexture'
/tmp/ccWT2wvp.o:main.cpp:function loadTexture(Image*): error: undefined reference to 'glTexImage2D'

我还有大约20个其他未定义的参考错误.因此，必须是我没有正确安装某些东西，或者缺少文件.我确实注意到我通过运行glxinfo检查了硬件加速信息，并且确实具有硬件加速.

I got about 20 other undefined reference errors. So, it must be that I do not have something installed correctly, or am missing files. I do note that I checked the hardware acceleration info by running glxinfo and I do have hardware acceleration.

1. 如何使用c ++使OpenGL正常工作

编辑:如果我同时使用了两个答案，则证明它是可行的:具体来说，我做了以下事情:

EDIT If I use a combination of both answers proved it works: Specifically I did the following:

someonespc:~/c++$ ls
imageloader.cpp  imageloader.h  main.cpp  Makefile  Makefile~  vtr.bmp
d2b2@d2b2-Aspire-7745G:~/c++$ g++ -Wall -lGL -o cube main.cpp imageloader.cpp -lglut -lGLU
imageloader.cpp: In function ‘Image* loadBMP(const char*)’:
imageloader.cpp:141:2: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
someonespc:~/c++$ ls
cube  imageloader.cpp  imageloader.h  main.cpp  Makefile  Makefile~  vtr.bmp

然后我运行./cube' and it worked! Please explain why putting -lGL and -`lGLU工作了

Then I ran ./cube' and it worked! Please explain why putting-lGLand-`lGLU worked

推荐答案

将-lGL添加到gcc命令行选项.它告诉链接器这些功能可能在libGL.so(这是libGL.so.1的链接)中找到.

Add -lGL to the gcc command line options. It tells the linker that the functions might be found in libGL.so (which is a link to libGL.so.1).

这篇关于C ++ OpenGL未定义引用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！