cgo is enabled on App Engine Go 1.11

0_CGO_ON_GAE111.md

You can use cgo on App Engine Go 1.11.

deploy

$ gcloud app deploy --quiet

call

$ curl -s $(gcloud app browse --service=cgo111 --no-launch-browser)
42

app.yaml

runtime: go111
service: cgo111

go.mod

module cgo111

main.go

package main

// typedef int (*intFunc) ();
//
// int
// bridge_int_func(intFunc f)
// {
//      return f();
// }
//
// int fortytwo()
// {
//      return 42;
// }
import "C"
import (
	"fmt"
	"log"
	"net/http"
	"os"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		f := C.intFunc(C.fortytwo)
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(fmt.Sprintln(int(C.bridge_int_func(f)))))
	})
	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", os.Getenv("PORT")), nil))
}