Question

我只是有一个简单的c主程序并且有一个类，VoronoiDiagramGenerator.cpp和VoronoiDiagramGenerator.h是类定义，在main函数中调用类方法。为什么我使用gcc和g ++提供不同的输出。使用gcc有一些错误。使用g ++就可以了。

jack@ubuntu:~/dev/practice$ gcc main.cpp VoronoiDiagramGenerator.cpp -o main
/tmp/ccbaXM5L.o:(.eh_frame+0x6b): undefined reference to `__gxx_personality_v0'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::VoronoiDiagramGenerator()':
VoronoiDiagramGenerator.cpp:(.text+0x22): undefined reference to `operator new(unsigned int)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::reset()':
VoronoiDiagramGenerator.cpp:(.text+0x168): undefined reference to `operator delete(void*)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::geominit()':
VoronoiDiagramGenerator.cpp:(.text+0xc3d): undefined reference to `sqrt'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::dist(Site*, Site*)':
VoronoiDiagramGenerator.cpp:(.text+0x1318): undefined reference to `sqrt'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::getfree(Freelist*)':
VoronoiDiagramGenerator.cpp:(.text+0x17aa): undefined reference to `operator new(unsigned int)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::cleanup()':
VoronoiDiagramGenerator.cpp:(.text+0x18cd): undefined reference to `operator delete(void*)'
VoronoiDiagramGenerator.cpp:(.text+0x1917): undefined reference to `operator delete(void*)'
VoronoiDiagramGenerator.cpp:(.text+0x1923): undefined reference to `operator new(unsigned int)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::cleanupEdges()':
VoronoiDiagramGenerator.cpp:(.text+0x19e4): undefined reference to `operator delete(void*)'
VoronoiDiagramGenerator.cpp:(.text+0x1a3f): undefined reference to `operator delete(void*)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::pushGraphEdge(float, float, float, float)':
VoronoiDiagramGenerator.cpp:(.text+0x1a8b): undefined reference to `operator new(unsigned int)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::pushDelaunayGraphEdge(float, float, float, float)':
VoronoiDiagramGenerator.cpp:(.text+0x1afa): undefined reference to `sqrt'
VoronoiDiagramGenerator.cpp:(.text+0x1b1a): undefined reference to `operator new(unsigned int)'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::clip_line(Edge*)':
VoronoiDiagramGenerator.cpp:(.text+0x1e50): undefined reference to `sqrt'
/tmp/ccCeOqcL.o: In function `VoronoiDiagramGenerator::generateVertexLinks()':
VoronoiDiagramGenerator.cpp:(.text+0x33f4): undefined reference to `operator delete[](void*)'
VoronoiDiagramGenerator.cpp:(.text+0x3413): undefined reference to `operator delete[](void*)'
collect2: ld 返回 1

但是使用g ++，一切正常

jack@ubuntu:~/dev/practice$ g++ main.cpp VoronoiDiagramGenerator.cpp -o main
jack@ubuntu:~/dev/practice$

Answer 1

两者都是由GCC工具链提供的，两者都是[包装]编译器前端，但是they are not the same thing：

gcc编译 C ;
g++编译 C ++ 。

C ++标准库符号以及C ++运行时为支持C ++代码所需的各种其他符号仅与后者链接（默认情况下）。

我只有一个简单的c主程序并且有一个类，VoronoiDiagramGenerator.cpp和VoronoiDiagramGenerator.h是类定义

我猜你的意思是一个简单的 C ++ 程序。 C不是C ++，C ++不是C.它们是两种不同的语言。

g ++和gcc之间的区别

1 个答案: