1，
gps_gateway.cpp:405:35: error: unused parameter 'callbacks' [-Werror,-Wunused-parameter]
static int gps_init(GpsCallbacks* callbacks)
clang_cflags: ["-Wno-c++11-extensions"],
cflags: [
2，
gps_fake.cc:84:10: error: unused variable 'pTmp' [-Werror,-Wunused-variable]
=》
"-Wno-unused-variable",
3，
gps_gateway.cpp:351:13: error: unused function 'gps_tty_read_thread' [-Werror,-Wunused-function]
static void gps_tty_read_thread(void * /*arg*/)
=》
"-Wno-unused-function",