Enable the component model by default

This commit enables the component model by default in the embedding API
and the CLI. This means that an opt-in of `-W component-model` is no
longer required and additionally `.wasm_component_model(true)` is no
longer required. Note that this won't impact existing embeddings since
the component model feature doesn't do much less `wasmtime::component`
is used, and if that's being used this is probably good news for you.

crates/wasmtime/src/config.rs

@@ -228,6 +228,7 @@ impl Config {
         ret.wasm_multi_value(true);
         ret.wasm_bulk_memory(true);
         ret.wasm_simd(true);
+        ret.wasm_component_model(true);
         ret.wasm_backtrace_details(WasmBacktraceDetails::Environment);
 
         // This is on-by-default in `wasmparser` since it's a stage 4+ proposal

src/common.rs

@@ -107,7 +107,7 @@ impl RunCommon {
 
     #[cfg(feature = "component-model")]
     fn ensure_allow_components(&self) -> Result<()> {
-        if self.common.wasm.component_model != Some(true) {
+        if self.common.wasm.component_model == Some(false) {
             bail!("cannot execute a component without `--wasm component-model`");
         }
 

tests/all/cli_tests.rs

@@ -760,6 +760,7 @@ fn component_missing_feature() -> Result<()> {
     let wasm = build_wasm(path)?;
     let output = get_wasmtime_command()?
         .arg("-Ccache=n")
+        .arg("-Wcomponent-model=n")
         .arg(wasm.path())
         .output()?;
     assert!(!output.status.success());
@@ -772,6 +773,7 @@ fn component_missing_feature() -> Result<()> {
     // also tests with raw *.wat input
     let output = get_wasmtime_command()?
         .arg("-Ccache=n")
+        .arg("-Wcomponent-model=n")
         .arg(path)
         .output()?;
     assert!(!output.status.success());
@@ -784,6 +786,27 @@ fn component_missing_feature() -> Result<()> {
     Ok(())
 }
 
+#[test]
+#[cfg_attr(not(feature = "component-model"), ignore)]
+fn component_enabled_by_default() -> Result<()> {
+    let path = "tests/all/cli_tests/component-basic.wat";
+    let wasm = build_wasm(path)?;
+    let output = get_wasmtime_command()?
+        .arg("-Ccache=n")
+        .arg(wasm.path())
+        .output()?;
+    assert!(output.status.success());
+
+    // also tests with raw *.wat input
+    let output = get_wasmtime_command()?
+        .arg("-Ccache=n")
+        .arg(path)
+        .output()?;
+    assert!(output.status.success());
+
+    Ok(())
+}
+
 // If the text format is invalid then the filename should be mentioned in the
 // error message.
 #[test]