VC12 fixes by @dalkon

src/framework/platform/win32crashhandler.cpp

@@ -75,7 +75,7 @@ void Stacktrace(LPEXCEPTION_POINTERS e, std::stringstream& ss)
     pSym = (PIMAGEHLP_SYMBOL)symBuffer;
 
     ZeroMemory(&sf, sizeof(sf));
-#ifdef __WIN64__
+#ifdef _WIN64
     sf.AddrPC.Offset = e->ContextRecord->Rip;
     sf.AddrStack.Offset = e->ContextRecord->Rsp;
     sf.AddrFrame.Offset = e->ContextRecord->Rbp;

src/framework/stdext/compiler.h

@@ -40,6 +40,7 @@
     #error "You need Visual Studio 2013 or greater to compile."
     #endif
     #pragma warning(disable:4244) // conversion from 'A' to 'B', possible loss of data
+    #pragma warning(disable:4267) // '?' : conversion from 'A' to 'B', possible loss of data
     #pragma warning(disable:4305) // 'initializing' : truncation from 'A' to 'B'
     #pragma warning(disable:4146) // unary minus operator applied to unsigned type, result still unsigned
     #pragma warning(disable:4800) // 'A' : forcing value to bool 'true' or 'false' (performance warning)

src/framework/stdext/math.cpp

@@ -23,6 +23,10 @@
 #include "math.h"
 #include <random>
 
+#ifdef _MSC_VER
+    #pragma warning(disable:4267) // '?' : conversion from 'A' to 'B', possible loss of data
+#endif
+
 namespace stdext {
 
 uint32_t adler32(const uint8_t *buffer, size_t size) {

src/framework/stdext/string.cpp

@@ -26,6 +26,10 @@
 #include <ctype.h>
 #include <physfs.h>
 
+#ifdef _MSC_VER
+    #pragma warning(disable:4267) // '?' : conversion from 'A' to 'B', possible loss of data
+#endif
+
 namespace stdext {
 
 std::string resolve_path(const std::string& filePath, std::string sourcePath)