Fix compilation with gcc

src/CBot/CBotInstr/CBotExprLitNan.cpp

@@ -23,6 +23,8 @@
 
 #include "CBot/CBotVar/CBotVar.h"
 
+#include <cmath>
+
 namespace CBot
 {
 
@@ -43,7 +45,7 @@ bool CBotExprLitNan::Execute(CBotStack* &pj)
     if (pile->IfStep()) return false;
     CBotVar*    var = CBotVar::Create("", CBotTypFloat);
 
-    var->SetValFloat(std::nanf(""));
+    var->SetValFloat(nanf(""));
     pile->SetVar(var);          // put on the stack
     return pj->Return(pile);    // forward below
 }

src/CBot/CBotInstr/CBotParExpr.cpp

@@ -38,6 +38,8 @@
 
 #include "CBot/CBotCStack.h"
 
+#include <cmath>
+
 namespace CBot
 {
 
@@ -218,7 +220,7 @@ CBotInstr* CBotParExpr::CompileLitExpr(CBotToken* &p, CBotCStack* pStack)
         CBotInstr* inst = new CBotExprLitNan();
         inst->SetToken(pp);
         CBotVar* var = CBotVar::Create("", CBotTypFloat);
-        var->SetValFloat(std::nanf(""));
+        var->SetValFloat(nanf(""));
         pStk->SetVar(var);
         return pStack->Return(inst, pStk);
     }

src/CBot/CBotInstr/CBotTwoOpExpr.cpp

@@ -31,6 +31,7 @@
 #include "CBot/CBotVar/CBotVar.h"
 
 #include <cassert>
+#include <cmath>
 #include <algorithm>
 
 namespace CBot

src/level/robotmain.cpp

@@ -112,6 +112,7 @@
 #include <algorithm>
 #include <iomanip>
 #include <stdexcept>
+#include <cmath>
 #include <ctime>
 
 #include <boost/lexical_cast.hpp>
@@ -4155,7 +4156,7 @@ bool CRobotMain::FreeSpace(Math::Vector &center, float minRadius, float maxRadiu
         }
     }
 
-    float nan = std::nanf("");
+    float nan = nanf("");
 
     center = Math::Vector{ nan, nan, nan };
 

src/math/half.cpp

@@ -100,7 +100,7 @@ float HaltToFloat(uint16_t value)
     // NaN
     else if ((exponent == 31) && (mantissa != 0))
     {
-        result = std::nanf("");
+        result = nanf("");
     }
     // Normal number
     else

src/script/scriptfunc.cpp

@@ -67,6 +67,8 @@
 
 #include "ui/displaytext.h"
 
+#include <cmath>
+
 using namespace CBot;
 
 CBotTypResult CScriptFunctions::cClassNull(CBotVar* thisclass, CBotVar* &var)
@@ -2325,7 +2327,7 @@ bool CScriptFunctions::rReceive(CBotVar* var, CBotVar* result, int& exception, v
         if ( err != ERR_OK )
         {
             script->m_taskExecutor->StopForegroundTask();
-            result->SetValFloat(std::nanf(""));
+            result->SetValFloat(nanf(""));
             return true;
         }
 
@@ -2336,7 +2338,7 @@ bool CScriptFunctions::rReceive(CBotVar* var, CBotVar* result, int& exception, v
 
     if ( script->m_returnValue == boost::none )
     {
-        result->SetValFloat(std::nanf(""));
+        result->SetValFloat(nanf(""));
     }
     else
     {
@@ -3657,11 +3659,11 @@ void CScriptFunctions::uObject(CBotVar* botThis, void* user)
     if (IsObjectBeingTransported(object))
     {
         pSub = pVar->GetItemList();  // "x"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
         pSub = pSub->GetNext();  // "y"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
         pSub = pSub->GetNext();  // "z"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
     }
     else
     {
@@ -3762,11 +3764,11 @@ void CScriptFunctions::uObject(CBotVar* botThis, void* user)
     if (IsObjectBeingTransported(object) || physics == nullptr)
     {
         pSub = pVar->GetItemList();  // "x"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
         pSub = pSub->GetNext();  // "y"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
         pSub = pSub->GetNext();  // "z"
-        pSub->SetValFloat(std::nanf(""));
+        pSub->SetValFloat(nanf(""));
     }
     else
     {