Merge #382

382: reduce suggested backends to the ones compiled into wasmer r=MarkMcCaskey a=MarkMcCaskey resolves #380 Co-authored-by: Mark McCaskey <mark@wasmer.io> Co-authored-by: Mark McCaskey <markmccaskey@users.noreply.github.com>
wasmerio · Apr 22, 2019 · baae2b3 · baae2b3
2 parents b7f98c8 + e8b2660
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,6 +5,7 @@ All PRs to the Wasmer repository must add to this file.
 Blocks of changes will separated by version increments.
 
 ## **[Unreleased]**
+- [#382](https://github.com/wasmerio/wasmer/pull/382) Improve error message on `--backend` flag to only suggest currently enabled backends
 - [#381](https://github.com/wasmerio/wasmer/pull/381) Allow retrieving propagated user errors.
 - [#379](https://github.com/wasmerio/wasmer/pull/379) Fix small return types from imported functions.
 - [#371](https://github.com/wasmerio/wasmer/pull/371) Add more Debug impl for WASI types

diff --git a/src/bin/wasmer.rs b/src/bin/wasmer.rs
@@ -105,7 +105,13 @@ enum Backend {
 
 impl Backend {
     pub fn variants() -> &'static [&'static str] {
-        &["singlepass", "cranelift", "llvm"]
+        &[
+            "cranelift",
+            #[cfg(feature = "backend:singlepass")]
+            "singlepass",
+            #[cfg(feature = "backend:llvm")]
+            "llvm",
+        ]
     }
 }