this might be a specific gcc version in a specific configuration, but this is the default - i haven't modified warning flags.

host.c: In function 'DBcopy_template_elements':
host.c:2489:4: warning: 'applicationid' may be used uninitialized in this function [-Wuninitialized]
host.c:2444:16: note: 'applicationid' was declared here
lld.c: In function 'DBlld_process_discovery_rule':
lld.c:785:4: warning: 'error_esc' may be used uninitialized in this function [-Wuninitialized]
lld.c:666:24: note: 'error_esc' was declared here
housekeeper.c: In function 'main_housekeeper_loop':
housekeeper.c:315:3: warning: call to function 'housekeeping_cleanup' without a real prototype [-Wunprototyped-calls]
housekeeper.c:45:12: note: 'housekeeping_cleanup' was declared here
nodehistory.c: In function 'node_history':
nodehistory.c:460:14: warning: 'clock' may be used uninitialized in this function [-Wuninitialized]
nodehistory.c:402:7: note: 'clock' was declared here
nodehistory.c:460:14: warning: 'value_double' may be used uninitialized in this function [-Wuninitialized]
nodehistory.c:403:10: note: 'value_double' was declared here