RC: forward declarations and link physims better

The simulators have been changed: due to linker errors that would arise
otherwise, a lot of functions are defined in them to avoid such errors.
Some functions are also defined in header files; in this commit, we
define most functoins in nr_dummy_functions.c, which is compiled in, not
by including the C file, but by adding it to the target in
CMakeLists.txt

- nr_dlsim+nr_ulsim need NR_IF_Module_init(), so it cannot be in
  nr_dummy_functions, but the others need it
- Link correcr NR_IF_Module_init() into these simulators, and reduce
  overall link list
- Correctly link remaining simulators

common/ran_context.h

@@ -34,17 +34,18 @@
 #define __RAN_CONTEXT_H__
 
 #include <pthread.h>
-#include "common/platform_constants.h"
-#include "PHY/defs_eNB.h"
-#include "PHY/types.h"
-#include "PHY/impl_defs_top.h"
-
-#include "PHY/defs_L1_NB_IoT.h"
-#include "RRC/LTE/defs_NB_IoT.h"
-#include "RRC/LTE/rrc_defs.h"
-#include "RRC/NR/nr_rrc_defs.h"
-#include <openair3/ocp-gtpu/gtp_itf.h>
+#include <stdint.h>
 
+// forward declarations to avoid including the full typess ***eNB;
+struct PHY_VARS_gNB_s;
+struct PHY_VARS_eNB_NB_IoT_s;
+struct eNB_RRC_INST_s;
+struct gNB_RRC_INST_s;
+struct eNB_MAC_INST_s;
+struct eNB_MAC_INST_NB_IoT_s;
+struct gNB_MAC_INST_s;
+struct gtpv1u_data_s;
+struct RU_t_s;
 
 typedef struct {
   /// RAN context config file name
@@ -98,7 +99,7 @@ typedef struct {
   /// NR MAC context variables
   struct gNB_MAC_INST_s **nrmac;
   /// GTPu descriptor 
-  gtpv1u_data_t *gtpv1u_data_g;
+  struct gtpv1u_data_s *gtpv1u_data_g;
   /// RU descriptors. These describe what each radio unit is supposed to do and contain the necessary functions for fronthaul interfaces
   struct RU_t_s **ru;
   /// Mask to indicate fronthaul setup status of RU (hard-limit to 64 RUs)

common/utils/telnetsrv/telnetsrv_enb_measurements.c

@@ -51,6 +51,8 @@
 #include "telnetsrv_cpumeasur_def.h"
 #include "openair2/LAYER2/MAC/mac.h"
 #include "openair1/PHY/phy_extern.h"
+#include "openair2/LAYER2/RLC/rlc.h"
+#include "openair2/LAYER2/PDCP_v10.1.0/pdcp.c"
 
 void measurcmd_display_macstats(telnet_printfunc_t prnt);
 void measurcmd_display_macstats_ue(telnet_printfunc_t prnt);

common/utils/telnetsrv/telnetsrv_enb_phycmd.c

@@ -38,6 +38,10 @@
 #include "telnetsrv.h"
 #define TELNETSRV_PHYCMD_MAIN
 #include "telnetsrv_phycmd.h"
+
+#include "PHY/defs_eNB.h"
+#include "LAYER2/MAC/mac_proto.h"
+
 char *prnbuff;
 extern int dump_eNB_stats(PHY_VARS_eNB *eNB, char *buffer, int length);