链接 openGL 库失败,因为它无法打开 libgl.so ...但它就在那里

Linking an openGL library fails because it can't open libgl.so ... but it's right there

本文关键字:libgl so 在那里 openGL 失败 链接 因为      更新时间:2023-10-16

当我尝试使用 openGL 制作一个对我来说非常难以捉摸的 c++ 项目时,我遇到了以下错误。当我运行生成文件时,我得到以下内容:

g++ -c init.cpp
g++ -o executable console.o init.o -lglut -lgl
/usr/bin/x86_64-linux-gnu-ld: cannot find -lgl
collect2: error: ld returned 1 exit status
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 1

好的,当然。找不到图书馆。我将这一行添加到我的生成文件中以进行调查

ld -lglut -lgl --verbose

我得到以下内容,其他事情

attempt to open //usr/local/lib/x86_64-linux-gnu/libglut.so failed
attempt to open //usr/local/lib/x86_64-linux-gnu/libglut.a failed
attempt to open //lib/x86_64-linux-gnu/libglut.so failed
attempt to open //lib/x86_64-linux-gnu/libglut.a failed
attempt to open //usr/lib/x86_64-linux-gnu/libglut.so succeeded
-lglut (//usr/lib/x86_64-linux-gnu/libglut.so)
attempt to open //usr/local/lib/x86_64-linux-gnu/libgl.so failed
attempt to open //usr/local/lib/x86_64-linux-gnu/libgl.a failed
attempt to open //lib/x86_64-linux-gnu/libgl.so failed
attempt to open //lib/x86_64-linux-gnu/libgl.a failed
attempt to open //usr/lib/x86_64-linux-gnu/libgl.so failed
attempt to open //usr/lib/x86_64-linux-gnu/libgl.a failed
attempt to open //usr/lib/x86_64-linux-gnu64/libgl.so failed
attempt to open //usr/lib/x86_64-linux-gnu64/libgl.a failed
attempt to open //usr/local/lib64/libgl.so failed
attempt to open //usr/local/lib64/libgl.a failed
attempt to open //lib64/libgl.so failed
attempt to open //lib64/libgl.a failed
attempt to open //usr/lib64/libgl.so failed
attempt to open //usr/lib64/libgl.a failed
attempt to open //usr/local/lib/libgl.so failed
attempt to open //usr/local/lib/libgl.a failed
attempt to open //lib/libgl.so failed
attempt to open //lib/libgl.a failed
attempt to open //usr/lib/libgl.so failed
attempt to open //usr/lib/libgl.a failed
attempt to open //usr/x86_64-linux-gnu/lib64/libgl.so failed
attempt to open //usr/x86_64-linux-gnu/lib64/libgl.a failed
attempt to open //usr/x86_64-linux-gnu/lib/libgl.so failed
attempt to open //usr/x86_64-linux-gnu/lib/libgl.a failed
ld: cannot find -lgl
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 1

因此,当我在线查找时,似乎大多数这些错误都与ld没有在正确的目录中查找有关,但是ld正在查找正确的目录,因为此尝试实际上针对正确的位置:

attempt to open //usr/lib/x86_64-linux-gnu/libgl.so failed

我不仅在该目录中有该文件,而且上次读取它是在 8:00,3 小时前,因为我能够以某种方式更早地链接它,即使我没有更改与链接相关的任何内容

这是我正在使用的生成文件。

cc=g++
edit: init.o console.o
ld -lglut -lgl --verbose
$(cc) -o executable console.o init.o -lglut -lgl
init.o: init.cpp
$(cc) -c init.cpp
console.o: console.cpp
$(cc) -c console.cpp
clean:
rm init.o console.o executable

这是init.cpp:

#include <cstdlib>
//#include </usr/include/GL/glew.h>
#include <GL/freeglut.h>
//#include <GL/gl.h>
void consoleDisplay(int a);
void renderCB(void);
void resizeCB(int W, int H);
void idleCB(void);
void timerCB(int Value);
void glutInitErrorFunc(void (*callback)(const char *fmt, va_list ap) );
void glutInitWarningFunc(void (*callback)(const char *fmt, va_list ap) );
int main(int argc, char** argv) {
glutInit(&argc, argv);
glutInitContextVersion(4, 0);
glutInitWindowSize(500, 500);
glutInitWindowPosition(300, 300);
int windowLeft= glutGet(GLUT_WINDOW_X);
int windowWidth= glutGet(GLUT_WINDOW_WIDTH);
consoleDisplay(windowLeft);
consoleDisplay(windowWidth);
int winID = glutCreateWindow("Hello again, world.");
glutReshapeFunc(resizeCB);
glutDisplayFunc(renderCB);
glutIdleFunc(idleCB);
glutTimerFunc(0, timerCB ,0);
glutMainLoop();
return 0;
}
void renderCB(void){
//doActualOpenGLStuffHere()
glutSwapBuffers();
glutPostRedisplay();
}
void resizeCB(int W, int H){
glViewport(0, 0, W, H);
}
void idleCB(void){
glutPostRedisplay();
}
void timerCB(int Value){
}

最后是控制台.cpp:

#include <iostream>
void consoleDisplay(int a){
std::cout << a << "n";
}

大多数 Linux 文件系统都区分大小写,因此当您在系统库目录中有一个libGL.so并且ld询问文件系统是否存在libgl.so时,它会说不,链接将失败。

解决方案:确保要传递到的库名称ld与磁盘上的大写相匹配:

$(cc) -o executable console.o init.o -lglut -lGL
^^ note the caps