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我有以下代碼:未定義的引用錯誤++
/tmp/cc38RdWw.o: In function `main':
pocoSender.cpp:(.text+0x4d): undefined reference to `Poco::Net::SocketAddress::SocketAddress(std::string const&, unsigned short)'
pocoSender.cpp:(.text+0x7d): undefined reference to `Poco::Net::DatagramSocket::DatagramSocket(Poco::Net::SocketAddress const&, bool)'
pocoSender.cpp:(.text+0x93): undefined reference to `Poco::Timestamp::Timestamp()'
pocoSender.cpp:(.text+0x11f): undefined reference to `Poco::Timestamp::~Timestamp()'
pocoSender.cpp:(.text+0x135): undefined reference to `Poco::Net::DatagramSocket::~DatagramSocket()'
pocoSender.cpp:(.text+0x140): undefined reference to `Poco::Net::SocketAddress::~SocketAddress()'
pocoSender.cpp:(.text+0x163): undefined reference to `Poco::Net::SocketAddress::~SocketAddress()'
pocoSender.cpp:(.text+0x1ac): undefined reference to `Poco::Timestamp::~Timestamp()'
pocoSender.cpp:(.text+0x1ca): undefined reference to `Poco::Net::DatagramSocket::~DatagramSocket()'
pocoSender.cpp:(.text+0x1d9): undefined reference to `Poco::Net::SocketAddress::~SocketAddress()'
/tmp/cc38RdWw.o: In function `Poco::DateTimeFormatter::format(Poco::Timestamp const&, std::string const&, int)':
pocoSender.cpp:(.text._ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi[_ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi]+0x15): undefined reference to `Poco::DateTime::DateTime(Poco::Timestamp const&)'
pocoSender.cpp:(.text._ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi[_ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi]+0x43): undefined reference to `Poco::DateTime::~DateTime()'
pocoSender.cpp:(.text._ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi[_ZN4Poco17DateTimeFormatter6formatERKNS_9TimestampERKSsi]+0x52): undefined reference to `Poco::DateTime::~DateTime()'
/tmp/cc38RdWw.o: In function `Poco::DateTimeFormatter::format(Poco::DateTime const&, std::string const&, int)':
pocoSender.cpp:(.text._ZN4Poco17DateTimeFormatter6formatERKNS_8DateTimeERKSsi[_ZN4Poco17DateTimeFormatter6formatERKNS_8DateTimeERKSsi]+0x41): undefined reference to `Poco::DateTimeFormatter::append(std::string&, Poco::DateTime const&, std::string const&, int)'
collect2: error: ld returned 1 exit status
我用下面的命令行編譯:
g++ -L/usr/local/lib -lPocoUtil -lPocoFoundation -lPocoNet pocoSender.cpp -o hello
#include "Poco/Net/DatagramSocket.h"
#include "Poco/Net/SocketAddress.h"
#include "Poco/Timestamp.h"
#include "Poco/DateTimeFormatter.h"
int main(int argc, char** argv)
{
Poco::Net::SocketAddress sa("127.0.0.1", 8080);
Poco::Net::DatagramSocket dgs(sa);
std::string syslogMsg;
Poco::Timestamp now;
syslogMsg = Poco::DateTimeFormatter::format(now,
"<14>%w %f %H:%M:%S Hello, world!");
return 0;
}
和編譯我碰到下面的錯誤後,
請不要將問題標記爲重複,因爲我已經包含使用g ++標誌所需的庫,但我是st生病得到這些錯誤。
庫在命令行上執行源文件和目標文件。 –
也許'-L/usr/local/lib'是指libs不存在的地方。另外可疑的是,如何在鏈接器命令中指定'pocoSender.cpp',它應該在**庫規範之前出現** ... –
[將c代碼鏈接到C++代碼時,g ++鏈接順序依賴關係可能重複] (http://stackoverflow.com/questions/3363398/g-linking-order-dependency-when-linking-c-code-to-c-code) –