我编译项目时收到错误消息,我找到了these之类的Q& A,但它对我没有帮助。我不明白我的错误在哪里以及如何解决它。我使用的是Mac OS X,我有一个Xcode,但它不是Xcode项目。
我的错误:
g++ cleanup_agent.cc -o cleanup_agent -lcurl
Undefined symbols for architecture x86_64:
"reader(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)", referenced from:
_main in cleanup_agent-12c8ac.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [build] Error 1
我的树:
.
├── Makefile
├── bad_words.txt
├── cleanup_agent.cc
├── src
│ ├── reader.cc
│ ├── reader.h
│ └── stdafx.h
└── test
└── unittest.cc
生成文件:
CC = g++
STDIN = cleanup_agent.cc
STDOUT = cleanup_agent
build: $(STDIN)
$(CC) $(STDIN) -o $(STDOUT) -lcurl
cleanup_agent.cc
:
#include "src/stdafx.h"
#include "src/reader.h"
int main() {
vector<string> bad_words;
bad_words = reader("bad_words.txt");
}
reader.h
:
#ifndef CLEANUP_AGENT_SRC_READER_H_
#define CLEANUP_AGENT_SRC_READER_H_
vector<string> reader(string filename);
#endif
reader.cc
:
#include "stdafx.h"
#include "reader.h"
#include <fstream>
vector<string> reader(string filename) {
vector<string> data;
fstream file;
file.open(filename, fstream::in);
if (file.good()) {
string line;
while (getline(file, line)) {
data.push_back(line);
}
} else {
cout << "file not found." << endl;
}
file.close();
return data;
}
答案 0 :(得分:1)
你的makefile很不稳定。过了一会儿,但试试这个:
CC = g++
STDIN = cleanup_agent.cc src/reader.cc
STDOUT = cleanup_agent
.PHONY: build
build: $(STDOUT)
$(STDOUT): $(STDIN)
$(CC) $(STDIN) -o $(STDOUT) -lcurl