Common Lisp implementations use the variable
*features* to reify information on implementation- or environment-specific properties and functionalities. This page explains the meaning of the features provided by CMUCL.
:ieee-floating-point :x3j13 :ansi-cl :common-lisp
:sparc :sun4 :sparcstation :sparc-v7 :sparc-v8 :sparc-v9 :x86 :hppa :alpha :sgi :solaris :sunos :svr4 :linux :glibc2 :bsd :freebsd :mach :irix :hpux :unix
:cgc :gencgc :mp :small :random-mt19937 :hash-new :complex-fp-vops :pcl :gerds-pcl :portable-commonloops :pcl-structures :new-assembler :python :cmu :cmu17 :cmu18 :cmu19 :common :clx :clm :hemlock :modular-arith :double-double :stack-checking :heap-overflow-check
Deprecated features no longer used
Here is a list of some of the features that used to be available but are no longer available. Many of these features are now standard parts of the build.
:fast-maxmin :propagate-fun-type :propagate-float-type :constrain-float-type :new-compiler