Information about the target operating system, environment, and CPU.
Operating system.
OS at runtime. If you're doing something which should compile differently on different OSes, then please use version(Windows), version(linux), etc. Microsoft 32 bit Windows systems
Microsoft 64 bit Windows systems
All Linux Systems
Mac OS X
FreeBSD
NetBSD
Solaris
Android
Other Posix Systems
The OS that the program was compiled for.
Byte order endianness.
version(BigEndian) and version(LittleEndian). Big endian byte order
Little endian byte order
The endianness that the program was compiled for.
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Licensed under the Boost License 1.0.
https://dlang.org/phobos/std_system.html