我遇到错误，我的可执行文件没有正确链接项目中的所有文件。我遇到这个问题的部分原因是错误信息是如此有趣和复杂，我无法弄清楚问题本身是什么。我为没有提供详细错误而道歉，但我不确定发生了什么。在我的简单makefile中，我指定构建一个可删除的。
main: main.o serial.o
g++ -o main main.o serial.o -Wall -lboost_system
main.o: main.cpp serial.h
g++ -c main.cpp
serial.o: serial.cpp serial.h
g++ -c serial.cpp
clean:
rm *.o main
我收到此错误。如果您愿意，我可以通过makefile启用详细信息。
Undefined symbols for architecture x86_64:
"Serial::open(std::string)", referenced from:
_main in main-783b4e.o
"Serial::Serial(std::string, boost::asio::io_service*)", referenced from:
_main in main-783b4e.o
"Serial::~Serial()", referenced from:
_main in main-783b4e.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: *** [all] Error 1
iMats-2:DroneOS_test wfehrnstrom$ make
g++ -o main main.cpp -Wall -lboost_system
Undefined symbols for architecture x86_64:
"Serial::open(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)", referenced from:
_main in main-1e75b1.o
"Serial::Serial(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, boost::asio::io_service*)", referenced from:
_main in main-1e75b1.o
"Serial::~Serial()", referenced from:
_main in main-1e75b1.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: *** [all] Error 1
导致此错误并编译的代码体如下
#ifndef IOSTREAM_H
#include <iostream>
#endif
#ifndef SERIAL_H
#include "serial.h"
#endif
//#include <boost/asio.hpp>
#define PORT "/dev/ttyy.usbmodem1411"
int main(){
boost::asio::io_service io;
Serial::Serial serial(PORT, &io);
serial.open(PORT);
return 0;
}
Serial.h定义为
#include <boost/asio.hpp>
#include <iostream>
#ifndef SERIAL_H
#define SERIAL_H
class Serial{
public:
Serial(std::string port_name,boost::asio::io_service* io, int baud_rate, std::string flow_control, std::string parity, float stop_bits);
Serial(std::string port_name, boost::asio::io_service* io);
~Serial();
void write(std::string stringToBuffer);
std::string read(int inputBufferLength, std::string delimiter);
void cancel();
void open(std::string port_name);
void close();
bool is_open();
private:
boost::asio::serial_port port_;
};
#endif
和Serial的完整版本，它是一个基于boost的asio库的简单包装类。
#ifndef IOSTREAM_H
#include <iostream>
#endif
#include "serial.h"
#include <boost/algorithm/string.hpp>
Serial::Serial(std::string port_name, boost::asio::io_service* io):port_(io, port_name){
//In default constructor, set baud rate to 9600
port_.set_option(boost::asio::serial_port::baud_rate(9600));
//Flow Control: allow the ability to slow down serial data in a wire and even stop it
port_.set_option(boost::asio::serial_port::flow_control(boost::asio::serial_port::flow_control::none));
//Specify whether to send a bit at the end of each binary transmission indicating whether the number of bits was odd
//or even.
port_.set_option(boost::asio::serial_port::parity(boost::asio::serial_port::parity::none));
//Specify how many stop bits there are at the end of the serial transmission
port_.set_option(boost::asio::serial_port::stop_bits(boost::asio::serial_port::stop_bits::one));
//open the serial port at the device name
port_.open(port_name);
}
Serial::Serial(std::string port_name, boost::asio::io_service* io, int baud_rate, std::string flow_control, std::string parity, float stop_bits):port_(io, port_name){
port_.set_option(boost::asio::serial_port::baud_rate(baud_rate));
//Configure parity and check for all cases
//if parity == none
if(parity == "none"){
port_.set_option(boost::asio::serial_port::parity(boost::asio::serial_port::parity::none));
}
//if parity is odd
else if(parity == "odd"){
port_.set_option(boost::asio::serial_port::parity(boost::asio::serial_port::parity::odd));
}
//if parity is even
else if(parity == "even"){
port_.set_option(boost::asio::serial_port::parity(boost::asio::serial_port::parity::even));
}
//Configure flow control
if(flow_control == "software"){
port_.set_option(boost::asio::serial_port::flow_control(boost::asio::serial_port::flow_control::software));
}
else if(flow_control=="hardware"){
port_.set_option(boost::asio::serial_port::flow_control(boost::asio::serial_port::flow_control::hardware));
}
else{
port_.set_option(boost::asio::serial_port::flow_control(boost::asio::serial_port::flow_control::none));
}
//Configure stop_bits
if(stop_bits == 1.0){
port_.set_option(boost::asio::serial_port::stop_bits(boost::asio::serial_port::stop_bits::one));
}
else if(stop_bits == 1.5){
port_.set_option(boost::asio::serial_port::stop_bits(boost::asio::serial_port::stop_bits::onepointfive));
}
else{
port_.set_option(boost::asio::serial_port::stop_bits(boost::asio::serial_port::stop_bits::two));
}
}
Serial::~Serial(){
std::cout << "Serial Port is being deleted" << std::endl;
}
void Serial::write(std::string in){
try{
port_.write_some(boost::asio::buffer(in));
}
catch(boost::system::system_error e){
std::cout << "Serial Write Operation Failed" << std::endl;
}
}
std::string Serial::read(int inputBufferLength,std::string delimiter){
char readBuf[256];
boost::asio::read(port_, boost::asio::buffer(readBuf, 256));
std::string read(readBuf, 256);
boost::algorithm::trim(read);
return read;
}
void Serial::open(std::string port_name){
port_.open(port_name);
}
void Serial::close(){
port_.close();
}
bool Serial::is_open(){
if(port_.is_open()){
return true;
}
return false;
}
void Serial::cancel(){
port_.cancel();
}
非常感谢你的帮助。再一次，抱歉我无法提供更多相关细节。
编辑：新错误
serial.cpp:7:68: error: no matching constructor for initialization of
'boost::asio::serial_port' (aka 'basic_serial_port<>')
...port_name, boost::asio::io_service* io):port_(io, port_name){
^ ~~~~~~~~~~~~~
/usr/local/include/boost/asio/basic_serial_port.hpp:105:12: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
explicit basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:85:12: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
explicit basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:126:3: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:69:12: note: candidate
constructor not viable: requires single argument 'io_service', but 2
arguments were provided
explicit basic_serial_port(boost::asio::io_service& io_service)
^
/usr/local/include/boost/asio/basic_serial_port.hpp:47:7: note: candidate
constructor (the implicit copy constructor) not viable: requires 1
argument, but 2 were provided
class basic_serial_port
^
serial.cpp:21:146: error: no matching constructor for initialization of
'boost::asio::serial_port' (aka 'basic_serial_port<>')
...flow_control, std::string parity, float stop_bits):port_(io, port_name){
^ ~~~~~~~~~~~~~
/usr/local/include/boost/asio/basic_serial_port.hpp:105:12: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
explicit basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:85:12: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
explicit basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:126:3: note: candidate
constructor not viable: no known conversion from 'boost::asio::io_service
*' to 'boost::asio::io_service &' for 1st argument; dereference the
argument with *
basic_serial_port(boost::asio::io_service& io_service,
^
/usr/local/include/boost/asio/basic_serial_port.hpp:69:12: note: candidate
constructor not viable: requires single argument 'io_service', but 2
arguments were provided
explicit basic_serial_port(boost::asio::io_service& io_service)
^
/usr/local/include/boost/asio/basic_serial_port.hpp:47:7: note: candidate
constructor (the implicit copy constructor) not viable: requires 1
argument, but 2 were provided
class basic_serial_port
^
2 errors generated.
我不确定为什么它不能将成员构造函数识别为有效