Merge #579

579: fix caching for other backends, improve default compiler code r=MarkMcCaskey a=MarkMcCaskey



Co-authored-by: Mark McCaskey <mark@wasmer.io>
Co-authored-by: Syrus Akbary <me@syrusakbary.com>

lib/runtime-core/src/backend.rs

@@ -32,6 +32,7 @@ pub enum Backend {
 impl Backend {
     pub fn variants() -> &'static [&'static str] {
         &[
+            #[cfg(feature = "backend-cranelift")]
             "cranelift",
             #[cfg(feature = "backend-singlepass")]
             "singlepass",

lib/runtime-core/src/cache.rs

@@ -20,6 +20,7 @@ pub enum Error {
     Unknown(String),
     InvalidFile(InvalidFileType),
     InvalidatedCache,
+    UnsupportedBackend(Backend),
 }
 
 impl From<io::Error> for Error {