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trivial-featurestrivialsystem

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This little library unifies the way how do different features are represented in *features* variable.

It provides information about an operating system, endianness and CPU architecture. Unification simplifies writing the cross-platform libraries.

For example, here is what we have on Closure CL:

CL-USER> (lisp-implementation-type)
"Clozure Common Lisp"

CL-USER> (member :64-bit *features*)
NIL

CL-USER> (member :darwin *features*)
(:DARWIN :LITTLE-ENDIAN-TARGET :LITTLE-ENDIAN-HOST)

CL-USER> (member :little-endian *features*)
NIL

CL-USER> (member :x86-64 *features*)
(:X86-64 :X86_64 :X86-TARGET :X86-HOST :X8664-TARGET ...)

But after the loading of the trivial-features:

CL-USER> (ql:quickload :trivial-features)

CL-USER> (member :64-bit *features*)
(:64-BIT :BSD :LITTLE-ENDIAN :SLYNK :QUICKLISP :ASDF3.3 :ASDF3.2 ...)

CL-USER> (member :darwin *features*)
(:DARWIN :LITTLE-ENDIAN-TARGET :LITTLE-ENDIAN-HOST)

CL-USER> (member :x86-64 *features*)
(:X86-64 :X86_64 :X86-TARGET :X86-HOST :X8664-TARGET :X8664-HOST ...)

CL-USER> (member :little-endian *features*)
(:LITTLE-ENDIAN :SLYNK :QUICKLISP :ASDF3.3 :ASDF3.2 :ASDF3.1 ...)

Here is what this library adds to the *features* for ClozureCL:

CL-USER> (defparameter *original-features* (copy-list *features*))

CL-USER> (ql:quickload :trivial-features)

CL-USER> (set-difference *features*
                         *original-features*)
(:LITTLE-ENDIAN :BSD :64-BIT)

To finalize, if you are going to use the conditional reader in your system and depend on OS or CPU architecture - use trivial-features.