improve Integer initialization

integer.cpp

@@ -50,8 +50,6 @@ bool AssignIntToInteger(const std::type_info &valueType, void *pInteger, const v
 	return true;
 }
 
-static const char s_RunAtStartup = (g_pAssignIntToInteger = AssignIntToInteger, 0);
-
 #ifdef SSE2_INTRINSICS_AVAILABLE
 template <class T>
 CPP_TYPENAME AllocatorBase<T>::pointer AlignedAllocator<T>::allocate(size_type n, const void *)
@@ -1047,8 +1045,6 @@ static void SetPentiumFunctionPointers()
 #endif
 }
 
-static const char s_RunAtStartupSetPentiumFunctionPointers = (SetPentiumFunctionPointers(), 0);
-
 void DisableSSE2()
 {
 	s_sse2Enabled = false;
@@ -2726,6 +2722,17 @@ void MultiplyByPower2Mod(word *R, const word *A, size_t k, const word *M, size_t
 
 // ******************************************************************
 
+InitializeInteger::InitializeInteger()
+{
+	if (!g_pAssignIntToInteger)
+	{
+#ifdef CRYPTOPP_X86ASM_AVAILABLE
+		SetPentiumFunctionPointers();
+#endif
+		g_pAssignIntToInteger = AssignIntToInteger;
+	}
+}
+
 static const unsigned int RoundupSizeTable[] = {2, 2, 2, 4, 4, 8, 8, 8, 8};
 
 static inline size_t RoundupSize(size_t n)

integer.h

@@ -67,12 +67,17 @@ NAMESPACE_BEGIN(CryptoPP)
 
 void CRYPTOPP_DLL CRYPTOPP_API DisableSSE2();
 
+struct InitializeInteger	// used to initialize static variables
+{
+	InitializeInteger();
+};
+
 //! multiple precision integer and basic arithmetics
 /*! This class can represent positive and negative integers
 	with absolute value less than (256**sizeof(word)) ** (256**sizeof(int)).
 	\nosubgrouping
 */
-class CRYPTOPP_DLL Integer : public ASN1Object
+class CRYPTOPP_DLL Integer : private InitializeInteger, public ASN1Object
 {
 public:
 	//! \name ENUMS, EXCEPTIONS, and TYPEDEFS