trivial-features ensures consistent `*FEATURES*` across multiple
Common Lisp implementations.
For example, on MacOS X platforms, while most Lisps push `:DARWIN` to
`*FEATURES*`, CLISP and Allegro push `:MACOS` and `:MACOSX` instead,
respectively. Some Lisps might not push any feature suggesting MacOS
X at all. trivial-features will make sure all Lisps will have
`:DARWIN` in the `*FEATURES*` list when running on MacOS X. This
way, you can write
#+darwin foo #-darwin bar
#+(or darwin macos macosx) foo
#-(or darwin macos macosx) bar
The included [SPEC.md] document describes the set of symbols that
should or should not be present in `CL:*FEATURES*` on certain
circumstances. This specification is implemented by the
TRIVIAL-FEATURES system which supports a handful of Lisps.
The test suite is, in effect, an implementation using [CFFI] that
is checked against the various implementations in `src/tf-*.lisp`.
trivial-features is MIT-licenced.