Squirrel

According to

http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html:

"
__LP64__
_LP64
These macros are defined, with value 1, if (and only if) the compilation is for a target where long int and pointer both use 64-bits and int uses 32-bit.
"

I believe _LP64 is the more commonly used one.

According to
http://msdn.microsoft.com/en-us/library/b0084kay(VS.80).aspx
and http://msdn.microsoft.com/en-us/library/b0084kay(VS.71).aspx

"
_M_IA64 Defined for 64-bit processors.
_WIN64 Defined for applications for Win64.
"

_M_IA64 isn't much use because it is defined even if you are using a 32 bit OS/compiler. So _WIN64 is the useful one for Windows.

Good thanks, I'll put those in squirrel.h in the next version.

Alberto