Switch to extalloc GC to use the external allocator

build-polkawasm.sh

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-docker build --tag polkawasm/tinygo:dev -f Dockerfile.polkawasm .
+docker build --tag polkawasm/tinygo:dev-ext -f Dockerfile.polkawasm .

compileopts/config.go

@@ -98,14 +98,19 @@ func (c *Config) GC() string {
 	if c.Target.GC != "" {
 		return c.Target.GC
 	}
-	return "conservative"
+	for _, tag := range c.Target.BuildTags {
+		if tag == "baremetal" || tag == "wasm" {
+			return "conservative"
+		}
+	}
+	return "extalloc"
 }
 
 // NeedsStackObjects returns true if the compiler should insert stack objects
 // that can be traced by the garbage collector.
 func (c *Config) NeedsStackObjects() bool {
 	switch c.GC() {
-	case "conservative":
+	case "conservative", "extalloc":
 		for _, tag := range c.BuildTags() {
 			if tag == "tinygo.wasm" {
 				return true

main.go

@@ -1369,7 +1369,7 @@ func main() {
 	command := os.Args[1]
 
 	opt := flag.String("opt", "z", "optimization level: 0, 1, 2, s, z")
-	gc := flag.String("gc", "", "garbage collector to use (none, leaking, conservative)")
+	gc := flag.String("gc", "", "garbage collector to use (none, leaking, conservative, extalloc)")
 	panicStrategy := flag.String("panic", "print", "panic strategy (print, trap)")
 	scheduler := flag.String("scheduler", "", "which scheduler to use (none, tasks, asyncify)")
 	serial := flag.String("serial", "", "which serial output to use (none, uart, usb)")