Support wasm32-unknown-emscripten

Author: pitdicker

Cargo.toml

@@ -46,7 +46,7 @@ cloudabi = { version = "0.0.3", optional = true }
 [target.'cfg(target_os = "fuchsia")'.dependencies]
 fuchsia-zircon = { version = "0.3.2", optional = true }
 
-[target.wasm32-unknown-unknown.dependencies]
+[target.'cfg(target_arch = "wasm32")'.dependencies]
 # use with `--target wasm32-unknown-unknown --features=stdweb`
 stdweb = { version = "0.4", optional = true }
 

src/rngs/os.rs

@@ -659,9 +659,7 @@ mod imp {
     }
 }
 
-#[cfg(all(target_arch = "wasm32",
-          not(target_os = "emscripten"),
-          not(feature = "stdweb")))]
+#[cfg(all(target_arch = "wasm32", not(feature = "stdweb")))]
 mod imp {
     use {Error, ErrorKind};
 
@@ -681,9 +679,7 @@ mod imp {
     }
 }
 
-#[cfg(all(target_arch = "wasm32",
-          not(target_os = "emscripten"),
-          feature = "stdweb"))]
+#[cfg(all(target_arch = "wasm32", feature = "stdweb"))]
 mod imp {
     use std::mem;
     use stdweb::unstable::TryInto;