all: add WebAssembly backend

target.go

@@ -7,6 +7,8 @@ import (
 	"path/filepath"
 	"runtime"
 	"strings"
+
+	"github.com/aykevl/go-llvm"
 )
 
 // Target specification for a given target. Used for bare metal targets.
@@ -30,6 +32,10 @@ type TargetSpec struct {
 
 // Load a target specification
 func LoadTarget(target string) (*TargetSpec, error) {
+	if target == "" {
+		target = llvm.DefaultTargetTriple()
+	}
+
 	spec := &TargetSpec{
 		Triple:      target,
 		BuildTags:   []string{runtime.GOOS, runtime.GOARCH},
@@ -54,7 +60,7 @@ func LoadTarget(target string) (*TargetSpec, error) {
 		// Expected a 'file not found' error, got something else.
 		return nil, err
 	} else {
-		// No target spec available. This is fine.
+		// No target spec available. Use the default one.
 	}
 
 	return spec, nil