optimized out becasue of boost lock

[HeatherHu]

Hi Everyone,

Did somebody meet the problem that optimized out when using lock? The debug info as follow:

``#0 __GI___pthread_mutex_lock (mutex=0x7fffb4042000)
at ../nptl/pthread_mutex_lock.c:66
#1 0x000000000044a248 in pthread_mutex_lock (m=)

at /usr/include/boost/thread/pthread/mutex.hpp:61

#2 lock (this=)

at /usr/include/boost/thread/pthread/mutex.hpp:113

#3 boost::unique_lockboost::mutex::lock (this=this@entry=0x7fffd0d95070)

at /usr/include/boost/thread/lock_types.hpp:346

#4 0x000000000047ca0d in unique_lock (m_=..., this=0x7fffd0d95070)

at /usr/include/boost/thread/lock_types.hpp:124

#5 ORB_SLAM::KeyFrame::GetConnectedKeyFrames (this=0x0)

at /home/wendy/catkin_ws/src/orb_slam/orb_slam/src/KeyFrame.cc:172

I have no idea about how to find the problem. Could some one meet this problem or give me a hint to figure out this. Really appreciate for your guys help.

Thanks.

Heather