- (register-foreign-features FEATURE1 FEATURE2 ...)syntax
For each feature F, accesses the corresponding boolean #define in C, usually generated by declare-foreign-features. Then, generates code to register or unregister the feature for future compiles.
The boolean define is prefixed with the current declaration-prefix, and the registered feature will be prefixed with the registration-prefix.
(declaration-prefix "HAVE_") (registration-prefix "MYEGG_") (register-foreign-features AF_UNIX)
will expand to code like:
(declare-foreign-variable HAVE_AF_UNIX bool "HAVE_AF_UNIX") (if HAVE_AF_UNIX (emit-register! 'MYEGG_AF_UNIX) (emit-unregister! 'MYEGG_AF_UNIX))
And when compiled and executed, the following is printed to standard output
(register-feature! 'MYEGG_AF_UNIX) ;; if AF_UNIX was defined (unregister-feature! 'MYEGG_AF_UNIX) ;; if AF_UNIX was not defined