在ubuntu中编译GLUT时出错 [英] Error with GLUT compile in ubuntu

问题描述

我尝试编译一些hello worldglut应用程序：

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

#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 '\033'

    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();
}

编译命令是：

gcc -lGL -lGLU hw_opengl.cpp -o hw_opengl

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

我安装了GLUT：
sudo apt-get install freeglut3 freeglut3 -dev

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

在/ usr / lib中有：
libglut.a

libglut.so

libglut .so.3

libglut.so.3.9.0

There are in /usr/lib: 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

推荐答案

GCC链接器可能按照它们在命令行上的顺序扫描库，这意味着它可能首先扫描库，没有人使用它们，因此您会得到错误。可以肯定，将库放在命令行最后：

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

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