Re^2: How to tell 32 or 64 bit

[bulk88]

length(pack('J',0))

in the past I used that, but then I realized that 64 bit IVs but 32 bit pointers and machine code Perls existed, so it is wrong. Another good way to telling is

perl -MConfig -e "print $Config{ptrsize}"

which will return 4 or 8, and is NOT the IV size