This is from an older compiler, so take it for what it’s worth - I’ll take care of the orte ones, but the bcol, nbc, and osc ones will need addressing:
pmix1_server_south.c: In function 'myerr': pmix1_server_south.c:58: warning: 'nm' may be used uninitialized in this function pmix1_client.c: In function 'myerr': pmix1_client.c:44: warning: 'nm' may be used uninitialized in this function base/rml_base_channel_handlers.c: In function 'orte_rml_base_close_channel_send_callback': base/rml_base_channel_handlers.c:95: warning: unused variable ‘peer' runtime/orte_data_server.c: In function 'orte_data_server': runtime/orte_data_server.c:174: warning: 'uid' may be used uninitialized in this function util/dash_host/dash_host.c: In function 'orte_util_add_dash_host_nodes': util/dash_host/dash_host.c:57: warning: 'slots' may be used uninitialized in this function util/dash_host/dash_host.c:58: warning: 'slots_given' may be used uninitialized in this function qos_ack_component.c: In function 'orte_qos_ack_recv_msg_timeout_callback': qos_ack_component.c:534: warning: unused variable 'msg' qos_ack_component.c: In function 'orte_qos_ack_msg_send_callback': qos_ack_component.c:667: warning: unused variable 'channel' qos_ack_component.c: In function 'ack_recv': qos_ack_component.c:316: warning: 'room_num' may be used uninitialized in this function ras_slurm_module.c: In function 'recv_data': ras_slurm_module.c:778: warning: 'app' may be used uninitialized in this function bcol_ptpcoll_allreduce.c: In function 'bcol_ptpcoll_allreduce_narraying_init': bcol_ptpcoll_allreduce.c:236: warning: unused variable 'dtype' bcol_ptpcoll_allreduce.c:235: warning: unused variable ‘count' nbc.c: In function 'NBC_Progress': nbc.c:297: warning: 'size' may be used uninitialized in this function osc_pt2pt_comm.c: In function 'ompi_osc_pt2pt_accumulate_w_req': osc_pt2pt_comm.c:424: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_comm.c:420: warning: 'frag' may be used uninitialized in this function osc_pt2pt_comm.c: In function 'ompi_osc_pt2pt_put_w_req': osc_pt2pt_comm.c:250: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_comm.c:242: warning: 'frag' may be used uninitialized in this function osc_pt2pt_data_move.c: In function 'ompi_osc_pt2pt_callback': osc_pt2pt_data_move.c:1615: warning: unused variable 'incoming_length' osc_pt2pt_comm.c: In function 'ompi_osc_pt2pt_rget_accumulate_internal': osc_pt2pt_comm.c:951: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_comm.c:947: warning: 'frag' may be used uninitialized in this function osc_pt2pt_data_move.c: In function 'ompi_osc_pt2pt_control_send': osc_pt2pt_data_move.c:213: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_data_move.c:212: warning: 'frag' may be used uninitialized in this function osc_pt2pt_data_move.c: In function 'ompi_osc_gacc_long_start': osc_pt2pt_data_move.c:961: warning: 'acc_data' may be used uninitialized in this function osc_pt2pt_data_move.c: In function 'ompi_osc_pt2pt_gacc_start': osc_pt2pt_data_move.c:914: warning: 'acc_data' may be used uninitialized in this function osc_pt2pt_comm.c: In function 'ompi_osc_pt2pt_rget_internal': osc_pt2pt_comm.c:744: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_comm.c:740: warning: 'frag' may be used uninitialized in this function osc_pt2pt_data_move.c: In function 'ompi_osc_pt2pt_acc_long_start': osc_pt2pt_data_move.c:831: warning: 'acc_data' may be used uninitialized in this function osc_pt2pt_comm.c: In function 'ompi_osc_pt2pt_compare_and_swap': osc_pt2pt_comm.c:601: warning: 'ptr' may be used uninitialized in this function osc_pt2pt_comm.c:594: warning: 'frag' may be used uninitialized in this function osc_rdma_active_target.c: In function 'ompi_osc_rdma_post_atomic': osc_rdma_active_target.c:183: warning: 'frag' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_compare_and_swap': osc_rdma_accumulate.c:693: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:691: warning: 'target_handle' may be used uninitialized in this function osc_rdma_passive_target.c: In function 'ompi_osc_rdma_unlock_atomic': osc_rdma_passive_target.c:239: warning: 'peer' may be used uninitialized in this function osc_rdma_passive_target.c: In function 'ompi_osc_rdma_lock_atomic': osc_rdma_lock.h:116: warning: 'frag' may be used uninitialized in this function osc_rdma_lock.h:116: warning: 'frag' may be used uninitialized in this function osc_rdma_passive_target.c: In function 'ompi_osc_rdma_lock_all_atomic': osc_rdma_lock.h:116: warning: 'frag' may be used uninitialized in this function osc_rdma_comm.c: In function 'ompi_osc_rdma_put': osc_rdma_comm.c:705: warning: 'target_address' may be used uninitialized in this function osc_rdma_comm.c:704: warning: 'target_handle' may be used uninitialized in this function osc_rdma_comm.c: In function 'ompi_osc_rdma_rget': osc_rdma_comm.c:740: warning: 'source_address' may be used uninitialized in this function osc_rdma_comm.c:739: warning: 'source_handle' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_get_accumulate': osc_rdma_accumulate.c:743: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:742: warning: 'target_handle' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_accumulate': osc_rdma_accumulate.c:743: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:742: warning: 'target_handle' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_raccumulate': osc_rdma_accumulate.c:743: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:742: warning: 'target_handle' may be used uninitialized in this function osc_rdma_comm.c: In function 'ompi_osc_rdma_rput': osc_rdma_comm.c:705: warning: 'target_address' may be used uninitialized in this function osc_rdma_comm.c:704: warning: 'target_handle' may be used uninitialized in this function osc_rdma_comm.c: In function 'ompi_osc_rdma_get': osc_rdma_comm.c:740: warning: 'source_address' may be used uninitialized in this function osc_rdma_comm.c:739: warning: 'source_handle' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_fetch_and_op': osc_rdma_accumulate.c:743: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:742: warning: 'target_handle' may be used uninitialized in this function osc_rdma_accumulate.c: In function 'ompi_osc_rdma_rget_accumulate': osc_rdma_accumulate.c:743: warning: 'target_address' may be used uninitialized in this function osc_rdma_accumulate.c:742: warning: 'target_handle' may be used uninitialized in this function osc_rdma_dynamic.c: In function 'ompi_osc_rdma_find_dynamic_region': osc_rdma_lock.h:116: warning: 'frag' may be used uninitialized in this function monitoring_test.c:81: warning: ‘flush_cvar_idx’ defined but not used