编译程序提供"undefined reference"
Compiling program gives "undefined reference"
我迷路了。我一直在Mac上的LLVM上成功编译我的程序,但是当我去Linux服务器并尝试使用g ++进行编译时,我遇到了大量的链接器错误。
以下为摘录:
/tmp/ccGbgd6T.o: In function `Scene::setBackgroundImage(String)':
Project.cpp:(.text+0x166): undefined reference to `Graph_lib::Image::Image(Point, String, Graph_lib::Suffix::Encoding)'
/tmp/ccGbgd6T.o: In function `Graph_lib::Window::~Window()':
Project.cpp:(.text._ZN9Graph_lib6WindowD2Ev[_ZN9Graph_lib6WindowD5Ev]+0xc): undefined reference to `vtable for Graph_lib::Window'
/tmp/ccGbgd6T.o: In function `Graph_lib::Shape::~Shape()':
Project.cpp:(.text._ZN9Graph_lib5ShapeD2Ev[_ZN9Graph_lib5ShapeD5Ev]+0xb): undefined reference to `vtable for Graph_lib::Shape'
/tmp/ccGbgd6T.o: In function `Graph_lib::Text::Text(Point, String const&)':
Project.cpp:(.text._ZN9Graph_lib4TextC2E5PointRK6String[_ZN9Graph_lib4TextC5E5PointRK6String]+0xe): undefined reference to `Graph_lib::Shape::Shape()'
Project.cpp:(.text._ZN9Graph_lib4TextC2E5PointRK6String[_ZN9Graph_lib4TextC5E5PointRK6String]+0x17): undefined reference to `vtable for Graph_lib::Text'
Project.cpp:(.text._ZN9Graph_lib4TextC2E5PointRK6String[_ZN9Graph_lib4TextC5E5PointRK6String]+0x67): undefined reference to `Graph_lib::Shape::add(Point)'
/tmp/ccGbgd6T.o: In function `Graph_lib::Button::Button(Point, int, int, String const&, void (*)(void*, void*))':
Project.cpp:(.text._ZN9Graph_lib6ButtonC2E5PointiiRK6StringPFvPvS5_E[_ZN9Graph_lib6ButtonC5E5PointiiRK6StringPFvPvS5_E]+0x40): undefined reference to `vtable for Graph_lib::Button'
这让我感到害怕,但后来我注意到所有错误都来自同一个类:Graph_lib
.这是Graph.h
的样子的一个非常精简的版本:(注意,这不是我的课)
#ifndef GRAPH_GUARD
#define GRAPH_GUARD 1
#include <...system stuff...>
namespace Graph_lib {
// lots of other classes in here
// this is just one
struct Image : Shape {
Image(Point xy, string file_name, Suffix::Encoding e = Suffix::none);
//rest of class
}
}
这里可能出了什么问题?
编辑:这是我用来编译的命令:
g++-4.6 -std=c++0x *.cpp -lfltk -lfltk_images
似乎
您忘记将项目与Graph.cpp
链接,或任何包含Graph_lib
类方法实现的文件。
看起来您的图形库丢失了。
使用g++, use -l <Graph lib>
链接时
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