Elegantly Determining System Architecture Within Perl

I'm looking for a simple way to determine whether a 开发者_如何学运维system is 32- or 64-bit from within Perl 5. I have read the perlvar manual page backwards and forwards, and have not discovered a variable that contains the system's CPU architecture (the CPU architecture Perl was compiled for will come close enough). This is the closest I have come:

chomp (my $arch = `uname -m`);

I was wondering if there was a more elegant way of determining this; I hate relying on backtick expressions, as they are both a bottleneck, tend to be insecure, and often (this example especially) break cross-platform compatibility. There is no reason Perl shouldn't already have this information available.

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See the Config module.

Maybe checking whether $Config{'archname64'} is set would be sufficient.

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Sys::Info::OS->bitness method will determine "bitness" of your OS.

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Maybe try a CPAN module such as https://metacpan.org/pod/Devel::CheckOS .

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You could use the POSIX module which provides a uname function similar to the uname utility.

use POSIX ();

my ($sysname, $nodename, $release, $version, $machine) = POSIX::uname;

Or, in your case :

my $arch = (POSIX::uname)[4];