Question

我正在Ubuntu 14.04 x64上构建一个守护程序应用程序，我收到一个链接器错误：

undefined reference to symbol 'pthread_rwlock_wrlock@@GLIBC_2.2.5'

代码是

#include <Poco/RWLock.h>

class DatabaseHandler
{
public:

  typedef std::shared_ptr<DatabaseHandler> Ptr;

  DatabaseHandler() {};
  virtual ~DatabaseHandler() {};

  virtual bool Connect(const STRING& connstring);
  bool Disconnect();

  BOOL IsConnected() {
    return (m_pSession && m_pSession->isConnected());
  }

protected:
  std::unique_ptr<Poco::Data::Session> m_pSession;
  Poco::RWLock m_write_lock;
};


class FADatabaseHandler : public DatabaseHandler
{
public:
  EDBReturnValues UpdateHouse(TFAData& data);

private:
  BOOL HouseExists(const UINT HouseId);
};

并实施..

EDBReturnValues FADatabaseHandler::UpdateHouse(TFAData& data)
{
  Poco::ScopedWriteRWLock lock(m_write_lock);
  .....
}

此文件的编译器命令行是

g++ -Wall -fexceptions -std=c++11 -g -lrt -lm -lpthread -DPOCO_STATIC -DPOCO_NO_AUTOMATIC_LIBS -DUSING_POCO_LIB -DBUILD_AS_SERVER -I/usr/local/mysql/include -c /home/daniele/src/TBServer/FADatabaseHandler.cpp -o obj/Debug/FADatabaseHandler.o

如果我注释了RWLock.h include，m_write_lock和ScopedWriteRWLock调用，我会收到错误：

/usr/bin/ld: /usr/local/lib/libPocoFoundationd.a(TextEncoding.o): undefined reference to symbol 'pthread_rwlock_wrlock@@GLIBC_2.2.5'

我哪里错了？

问候。

Answer 1

如果你使用CMake，你可以这样做：

...
find_package(Threads)
...

target_link_libraries(
    ...
    ${CMAKE_THREAD_LIBS_INIT}
)

Poco RWLock - 对'pthread_rwlock_wrlock @@ GLIBC_2.2.5的未定义引用

1 个答案: