fix compilation for gcc 4.x

srsenb/src/metrics_stdout.cc

@@ -144,7 +144,7 @@ std::string metrics_stdout::float_to_string(float f, int digits)
 {
   std::ostringstream os;
   int precision;
-  if(isnan(f) or abs(f) < 0.0001) {
+  if (isnan(f) or fabs(f) < 0.0001) {
     f = 0.0;
     precision = digits-1;
   }

srsenb/src/phy/phch_worker.cc

@@ -1105,7 +1105,7 @@ int phch_worker::read_ce_abs(float *ce_abs) {
   int g = (sz - 12*phy->cell.nof_prb)/2;
   for (i = 0; i < 12*phy->cell.nof_prb; i++) {
     ce_abs[g+i] = 20 * log10(cabs(enb_ul.ce[i]));
-    if (isinf(ce_abs[g+i])) {
+    if (std::isinf(ce_abs[g + i])) {
       ce_abs[g+i] = -80;
     }
   }
@@ -1119,7 +1119,7 @@ int phch_worker::read_ce_arg(float *ce_arg) {
   int g = (sz - 12*phy->cell.nof_prb)/2;
   for (i = 0; i < 12*phy->cell.nof_prb; i++) {
     ce_arg[g+i] = cargf(enb_ul.ce[i]) * 180.0f / (float) M_PI;
-    if (isinf(ce_arg[g+i])) {
+    if (std::isinf(ce_arg[g + i])) {
       ce_arg[g+i] = -80;
     }
   }

srsue/hdr/upper/rrc.h

@@ -69,7 +69,7 @@ class cell_t
   }
   // NaN means an RSRP value has not yet been obtained. Keep then in the list and clean them if never updated
   bool greater(cell_t *x) {
-    return rsrp > x->rsrp || isnan(rsrp);
+    return rsrp > x->rsrp || std::isnan(rsrp);
   }
   bool plmn_equals(asn1::rrc::plmn_id_s plmn_id)
   {
@@ -142,7 +142,7 @@ class cell_t
   }
 
   void set_rsrp(float rsrp) {
-    if (!isnan(rsrp)) {
+    if (!std::isnan(rsrp)) {
       this->rsrp = rsrp;
     }
     in_sync = true;

srsue/src/metrics_stdout.cc

@@ -123,8 +123,7 @@ std::string metrics_stdout::float_to_eng_string(float f, int digits)
 
   std::string factor;
 
-  if ( abs( degree ) < 9 )
-  {
+  if (abs(degree) < 9) {
     if(degree < 0)
       factor = prefixes[0][ abs( degree ) ];
     else

srsue/src/phy/phch_worker.cc

@@ -1591,7 +1591,7 @@ int phch_worker::read_ce_abs(float *ce_abs, uint32_t tx_antenna, uint32_t rx_ant
   int g = (sz - 12*cell.nof_prb)/2;
   for (i = 0; i < 12*cell.nof_prb; i++) {
     ce_abs[g+i] = 20 * log10f(cabsf(ue_dl.ce_m[tx_antenna][rx_antenna][i]));
-    if (isinf(ce_abs[g+i])) {
+    if (std::isinf(ce_abs[g + i])) {
       ce_abs[g+i] = -80;
     }
   }