here is the output of commands.
address@hidden:build]$gnuradio-config-info -v --cflags --cc --cxx
v3.7.9.2-216-g681846ff
cc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software see the source for copying conditions. There is NO
warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
c++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software see the source for copying conditions. There is NO
warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
/usr/bin/cc:::-O3 -DNDEBUG -fvisibility=hidden -Wsign-compare -Wall -Wno-uninitialized
/usr/bin/c++:::-O3 -DNDEBUG -fvisibility=hidden -Wsign-compare -Wall -Wno-uninitialized
address@hidden:build]$