Run make coveralls encounters error if WITH_GOLANG=ON

[typhoonzero]

Build options: -DWITH_GOLANG=ON -DWITH_COVERAGE=ON -DCOVERALLS_UPLOAD=ON

# github.com/PaddlePaddle/Paddle/go/pserver
pserver/client/c/libpaddle_go_optimizer.a(optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_optimizer.cc':
/paddle/paddle/optimizer/optimizer.cc:106: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(parameter_optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_parameter_optimizer.cc':
/paddle/paddle/optimizer/parameter_optimizer.cc:92: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(parameter_optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(OptimizerConfig.pb.cc.o): In function `_GLOBAL__sub_I_65535_0_OptimizerConfig.pb.cc':
/paddle/build/proto/OptimizerConfig.pb.cc:6152: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(OptimizerConfig.pb.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(adadelta_optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_adadelta_optimizer.cc':
/paddle/paddle/optimizer/adadelta_optimizer.cc:69: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(adadelta_optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(adagrad_optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_adagrad_optimizer.cc':
/paddle/paddle/optimizer/adagrad_optimizer.cc:57: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(adagrad_optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(sgd_optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_sgd_optimizer.cc':
/paddle/paddle/optimizer/sgd_optimizer.cc:65: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(sgd_optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
pserver/client/c/libpaddle_go_optimizer.a(adam_optimizer.cc.o): In function `_GLOBAL__sub_I_65535_0_adam_optimizer.cc':
/paddle/paddle/optimizer/adam_optimizer.cc:63: undefined reference to `__gcov_init'
pserver/client/c/libpaddle_go_optimizer.a(adam_optimizer.cc.o):(.data.rel+0x20): undefined reference to `__gcov_merge_add'
collect2: error: ld returned 1 exit status
make[2]: *** [go/cmd/pserver/pserver_timestamp] Error 2
make[1]: *** [go/cmd/pserver/CMakeFiles/pserver.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....