I cannot get GDB 8.3 to work

I had trouble with the bundled gdb so i used my own version 8.3 and it will not show any variables in debugger mode and has this in the GDB window.

GNU gdb (GDB) 8.3
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Function "__cxx_global_var_init" not defined.
Function "__libc_csu_init" not defined.

my cmakelist.txt is set up as follows.

cmake_minimum_required(VERSION 3.15)
project(UDP_Server)

SET(CMAKE_C_COMPILER   /usr/local/bin/gcc-9)
SET(CMAKE_CXX_COMPILER /usr/local/bin/g++-9)

set(SOURCE_FILES udp_server.cpp)
add_executable(UDP_Server ${SOURCE_FILES})