I'm looking to differentiate between Core Solo/Duo and Core 2 Duo processors for 64-bit support.
On a Core 2 Duo, then `sysctl hw.cpu64bit_capable`
gives 1
, as desired, but on a 32-bit processor, it throws an error, saying:
second level name cpu64bit_capable in hw.cpu64bit_capable is invalid
What's the best way to detect a 64-bit processor?
Thanks.
You can still use your sysctl
command by looking at the command's return value.
$ irb
>> system("sysctl hw.cpu64bit_capable > /dev/null 2>&1")
=> true
On 32 bit CPU it should return false
.
Alternatively, depending what you're really looking for, you can test for 64 bit EFI with ioreg
, though I think your CPU could still be 64 bit with a 32 bit EFI.
On a 64 bit EFI machine, you'd get this:
$ irb
>> system("ioreg -l -p IODeviceTree | grep firmware-abi | grep -q EFI64")
=> true
On a machine lacking 64 bit EFI, you'd get false
.
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