C++ 在 ubuntu 中编译 GLUT 时出错

Error with GLUT compile in ubuntu

提问by G-71

I try to compile some "hello world" glut application:

我尝试编译一些“hello world” glut应用程序：

#include <stdlib.h>

#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

GLint Width = 512, Height = 512;

const int CubeSize = 200;

void Display(void)
{
    int left, right, top, bottom;

    left  = (Width - CubeSize) / 2;
    right = left + CubeSize;
    bottom = (Height - CubeSize) / 2;
    top = bottom + CubeSize;

    glClearColor(0, 0, 0, 1);
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3ub(255,0,0);
    glBegin(GL_QUADS);
      glVertex2f(left,bottom);
      glVertex2f(left,top);
      glVertex2f(right,top);
      glVertex2f(right,bottom);
    glEnd();

    glFinish();
}

void Reshape(GLint w, GLint h)
{
    Width = w;
    Height = h;
    glViewport(0, 0, w, h);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, w, 0, h, -1.0, 1.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void Keyboard(unsigned char key, int x, int y)
{
#define ESCAPE '3'

    if( key == ESCAPE )
        exit(0);
}

main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB);
    glutInitWindowSize(Width, Height);
    glutCreateWindow("Red square example");

    glutDisplayFunc(Display);
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Keyboard);

    glutMainLoop();
}

The compile command is:

编译命令是：

gcc -lGL -lGLU hw_opengl.cpp -o hw_opengl

I've got the following errors:

我有以下错误：

/tmp/ccbnBFHC.o: In function `Display()':
hw_opengl.cpp:(.text+0x6c): undefined reference to `glClearColor'
hw_opengl.cpp:(.text+0x78): undefined reference to `glClear'
hw_opengl.cpp:(.text+0x94): undefined reference to `glColor3ub'
hw_opengl.cpp:(.text+0xa0): undefined reference to `glBegin'
hw_opengl.cpp:(.text+0xb4): undefined reference to `glVertex2f'
hw_opengl.cpp:(.text+0xc8): undefined reference to `glVertex2f'
hw_opengl.cpp:(.text+0xdc): undefined reference to `glVertex2f'
hw_opengl.cpp:(.text+0xf0): undefined reference to `glVertex2f'
hw_opengl.cpp:(.text+0xf5): undefined reference to `glEnd'
hw_opengl.cpp:(.text+0xfa): undefined reference to `glFinish'
/tmp/ccbnBFHC.o: In function `Reshape(int, int)':
hw_opengl.cpp:(.text+0x134): undefined reference to `glViewport'
hw_opengl.cpp:(.text+0x140): undefined reference to `glMatrixMode'
hw_opengl.cpp:(.text+0x145): undefined reference to `glLoadIdentity'
hw_opengl.cpp:(.text+0x173): undefined reference to `glOrtho'
hw_opengl.cpp:(.text+0x17f): undefined reference to `glMatrixMode'
hw_opengl.cpp:(.text+0x184): undefined reference to `glLoadIdentity'
/tmp/ccbnBFHC.o: In function `main':
hw_opengl.cpp:(.text+0x1c1): undefined reference to `glutInit'
hw_opengl.cpp:(.text+0x1cd): undefined reference to `glutInitDisplayMode'
hw_opengl.cpp:(.text+0x1e4): undefined reference to `glutInitWindowSize'
hw_opengl.cpp:(.text+0x1f0): undefined reference to `glutCreateWindow'
hw_opengl.cpp:(.text+0x1fc): undefined reference to `glutDisplayFunc'
hw_opengl.cpp:(.text+0x208): undefined reference to `glutReshapeFunc'
hw_opengl.cpp:(.text+0x214): undefined reference to `glutKeyboardFunc'
hw_opengl.cpp:(.text+0x219): undefined reference to `glutMainLoop'
collect2: ld returned 1 exit status

I've install GLUT: sudo apt-get install freeglut3 freeglut3-dev

我已经安装了 GLUT： sudo apt-get install freeglut3 freeglut3-dev

There are in /usr/lib: libglut.a
libglut.so
libglut.so.3
libglut.so.3.9.0

在/usr/lib中有：libglut.a
libglut.so
libglut.so.3
libglut.so.3.9.0

locate glu.h
/home/goran/QtSDK/QtSources/4.8.0/src/3rdparty/webkit/Source/ThirdParty/glu/internal_glu.h
/usr/include/GL/glu.h

/usr/include/GL/gl.h

locate gl.h
...
/usr/include/GL/gl.h

What do I do incorrectly?

我做错了什么？

回答by Some programmer dude

The GCC linker may scan libraries in the order they are on the command line, which means for you it may scan the libraries first and sees no one using them, and therefore you get the errors. To be sure, place the libraries last on the command line:

GCC 链接器可能会按照它们在命令行上的顺序扫描库，这意味着它可能会先扫描库，然后发现没有人使用它们，因此您会收到错误消息。可以肯定的是，将库放在命令行的最后：

gcc hw_opengl.cpp -o hw_opengl -lGL -lGLU -lglut

回答by Sudip Das

g++ filename.cpp -lGL -lglut -o exfilename

and then

进而

./exfilename

回答by shadowglen

It is because that xlibmesa-gl-dev and xlibmesa-glu-dev do not make soft link to file libGL.so and libGLU.so, so ld cannot find them to link with your code.

这是因为 xlibmesa-gl-dev 和 xlibmesa-glu-dev 没有对文件 libGL.so 和 libGLU.so 进行软链接，所以 ld 找不到它们与您的代码链接。

回答by shadowglen

You're missing -lglut.

你不见了-lglut。

The correct compilation command is gcc -lGL -lglut -lGLU hw_opengl.cpp -o hw_opengl

正确的编译命令是 gcc -lGL -lglut -lGLU hw_opengl.cpp -o hw_opengl

回答by xIN3N

Check whether you installed binutils-gold(Gold linker) or not if not, install it and if you've already that then remove it and try at terminal,

检查您是否安装了binutils-gold（黄金链接器），如果没有，请安装它，如果您已经安装了，则将其删除并在终端上尝试，

g++ sourcefile.cpp -lglut

回答by Julie

g++ -lglut -lGLU -lGL helloWorld.cpp -o helloWorld

g++, not gcc, for cpp

g++, 不是gcc, 对于 cpp