title: Is there a list of all cfg features?
body: <p>Rust has the ability to <a href="https://doc.rust-lang.org/book/conditional-compilation.html" rel="noreferrer">check configuration at build</a> time with, e.g., <code>#[cfg(target_os = "linux")]</code> or  <code>if cfg!(target_os = "linux") {...}</code>, where <code>target_os</code> is a <em>feature</em>.</p>
  
  <p>Is there a list of all (or, at least, commonly used) features that can be checked in Rust?</p>
  
  <hr>
  
  <p>See related question regarding <em>attributes</em> <a href="https://stackoverflow.com/questions/37900513/is-there-an-exhaustive-list-of-standard-attributes-anywhere?noredirect=1&amp;lq=1">Is there an exhaustive list of standard attributes anywhere?</a>.</p>