math: Use 64-bit integer type for computation

Source/cmExprParserHelper.cxx

@@ -13,6 +13,7 @@ cmExprParserHelper::cmExprParserHelper()
 {
   this->FileLine = -1;
   this->FileName = nullptr;
+  this->Result = 0;
 }
 
 cmExprParserHelper::~cmExprParserHelper()
@@ -85,7 +86,7 @@ void cmExprParserHelper::Error(const char* str)
   this->ErrorString = ostr.str();
 }
 
-void cmExprParserHelper::SetResult(int value)
+void cmExprParserHelper::SetResult(KWIML_INT_int64_t value)
 {
   this->Result = value;
 }

Source/cmExprParserHelper.h

@@ -5,6 +5,8 @@
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
+#include "cm_kwiml.h"
+
 #include <string>
 #include <vector>
 
@@ -13,7 +15,7 @@ class cmExprParserHelper
 public:
   struct ParserType
   {
-    int Number;
+    KWIML_INT_int64_t Number;
   };
 
   cmExprParserHelper();
@@ -24,9 +26,9 @@ public:
   int LexInput(char* buf, int maxlen);
   void Error(const char* str);
 
-  void SetResult(int value);
+  void SetResult(KWIML_INT_int64_t value);
 
-  int GetResult() { return this->Result; }
+  KWIML_INT_int64_t GetResult() { return this->Result; }
 
   const char* GetError() { return this->ErrorString.c_str(); }
 
@@ -41,7 +43,7 @@ private:
 
   void CleanupParser();
 
-  int Result;
+  KWIML_INT_int64_t Result;
   const char* FileName;
   long FileLine;
   std::string ErrorString;

Source/cmMathCommand.cxx

@@ -2,10 +2,11 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmMathCommand.h"
 
-#include <stdio.h>
-
 #include "cmExprParserHelper.h"
 #include "cmMakefile.h"
+#include "cm_kwiml.h"
+
+#include <stdio.h>
 
 class cmExecutionStatus;
 
@@ -44,7 +45,7 @@ bool cmMathCommand::HandleExprCommand(std::vector<std::string> const& args)
   }
 
   char buffer[1024];
-  sprintf(buffer, "%d", helper.GetResult());
+  sprintf(buffer, "%" KWIML_INT_PRId64, helper.GetResult());
 
   this->Makefile->AddDefinition(outputVariable, buffer);
   return true;