我的C代码有一个严重的问题,我似乎似乎无法让它编译,我真的不知道为什么.
我已经尝试在线研究,找不到问题的解决方案,你有什么想法吗？
谢谢你的时间！
Undefined symbols for architecture x86_64:
"_Insert",referenced from:
_InsertNode in part1.o
(maybe you meant: _InsertNode)
"_Create",referenced from:
_findShortestPaths in part1.o
"_DeleteMin",referenced from:
_findShortestPaths in part1.o
"_decreaseKey",referenced from:
_findShortestPaths in part1.o
"_GetMin",referenced from:
_findShortestPaths in part1.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [part1] Error 1
来自part1.c的Snippits
#include "limits.h"
#include "pegBinaryHeap.h"
void InsertNode(int distance,Node* node,PriorityQueue PQ) {
...
Insert(*item,PQ);
}
...
int* findShortestPaths(Graph *graph,int start) {
...
//Priority queue ordered by distance
PriorityQueue pq = Create(graph->MaxSize);
for(int i = 0; i < graph->MaxSize; i++) {
...
}
//While the queue isn't empty:
while((currentPqItem=GetMin(pq)) != NULL) {
...
DeleteMin(pq);
//for each node accesable from currentNode
List *currentNeighbour = currentNode.outlist;
while(currentNeighbour!=NULL) {
...
decreaseKey(currentNode.id,newDistance,pq);
} // end for
}// end while
}
int main(int argc,char *argv[])
{
Graph mygraph;
return 0;
}
和它似乎在抱怨的.h文件
#include "graph.h"
struct HeapStruct;
typedef struct HeapStruct *PriorityQueue;
typedef struct {
int distance;
Node *node;
} QueueType;
PriorityQueue Create( int MaxSize );
void Destroy( PriorityQueue H );
int Insert( QueueType Item,PriorityQueue H );
QueueType DeleteMin( PriorityQueue H );
QueueType* GetMin( PriorityQueue H );
void decreaseKey(int nodeId,int value,PriorityQueue H);
解决方法
你可以编译,但是你无法链接.
part1.o正在使用您在最后一个.h文件中定义的函数,并且无法找到实现.当您链接程序时,您需要确保在包含这些函数的实现的对象文件(或库)中链接.你可能做了以下事情：
gcc part1.c -o myapp
因此链接器没有所有的拼图.
如果要编译的部分,您需要：
gcc -c part1.c -o part1.o gcc -c implementations.c -o implementations.o gcc implementations.o part1.o -o myapp
在这里,所有.c文件都分别编译成对象(.o)文件,然后链接到可执行文件中.或者你可以一下子做所有事情：
gcc part1.c implementations.c -o myapp
如果实现在一个库(libimplementations.a)中：
gcc part1.c -Lpath/to/libs -limplementations -o myapp
