Cargo Features

[dependencies]
objc2-proc-macros = { version = "0.1.1", default-features = false, features = ["apple", "gnustep-1-7", "gnustep-1-8", "gnustep-1-9", "gnustep-2-0", "gnustep-2-1"] }
default = apple

The apple feature is set by default whenever objc2-proc-macros is added without default-features = false somewhere in the dependency tree.

apple default

Runtime selection (for future compatibility)

gnustep-1-7 gnustep-1-8?
gnustep-1-8 gnustep-1-9? = gnustep-1-7
gnustep-1-9 gnustep-2-0? = gnustep-1-8
gnustep-2-0 gnustep-2-1? = gnustep-1-9
gnustep-2-1 = gnustep-2-0