Fix doc, threads are enabled by default now (#3665)

* Fix doc, threads are enabled by default now

* Do not remove enable-thread, just mark at as deprecated

lib/c-api/src/wasm_c_api/unstable/features.rs

@@ -72,12 +72,12 @@ pub extern "C" fn wasmer_features_delete(_features: Option<Box<wasmer_features_t
 ///
 /// The [WebAssembly threads proposal][threads] is not currently fully
 /// standardized and is undergoing development. Support for this feature can
-/// be enabled through this method for appropriate WebAssembly modules.
+/// be disabled through this method for appropriate WebAssembly modules.
 ///
 /// This feature gates items such as shared memories and atomic
 /// instructions.
 ///
-/// This is `false` by default.
+/// This is `true` by default.
 ///
 /// [threads]: https://github.com/webassembly/threads
 ///

lib/cli/src/common.rs

@@ -13,9 +13,13 @@ pub struct WasmFeatures {
     #[clap(long = "enable-simd")]
     pub simd: bool,
 
-    /// Enable support for the threads proposal.
+    /// Disable support for the threads proposal.
+    #[clap(long = "disable-threads")]
+    pub disable_threads: bool,
+
+    /// Deprecated, threads are enabled by default.
     #[clap(long = "enable-threads")]
-    pub threads: bool,
+    pub _threads: bool,
 
     /// Enable support for the reference types proposal.
     #[clap(long = "enable-reference-types")]

lib/cli/src/store.rs

@@ -83,9 +83,12 @@ impl CompilerOptions {
 
     /// Get the enaled Wasm features.
     pub fn get_features(&self, mut features: Features) -> Result<Features> {
-        if self.features.threads || self.features.all {
+        if !self.features.disable_threads || self.features.all {
             features.threads(true);
         }
+        if self.features.disable_threads && !self.features.all {
+            features.threads(false);
+        }
         if self.features.multi_value || self.features.all {
             features.multi_value(true);
         }