Cargo Features

[dependencies]
softfloat-sys = { version = "0.1.4", default-features = false, features = ["8086", "8086-sse", "riscv"] }
default = 8086-sse

The 8086-sse feature is set by default whenever softfloat-sys is added without default-features = false somewhere in the dependency tree.

8086
8086-sse default
arm-vfpv2 arm-vfpv2-defaultnan riscv

softfloat-sys has 4 features without comments.