go: cmd/cgo: rt0_go failure on Windows when using zig cc

Hello, any Go developers interested in working with Zig developers on this use case?

Upstream issue: https://github.com/ziglang/zig/issues/7874 Tested with go 1.15.5.

main.go

package main

//int Add(int a, int b){
//    return a+b;
//}
import "C"
import "fmt"

func main() {
	a := C.int(10)
	b := C.int(20)
	c := C.Add(a, b)
	fmt.Println(c) // 30
}

CGO_ENABLED=1 GOOS=windows GOARCH=amd64 CC="zcc" CXX="zc++" go build main.go

zcc

#!/bin/sh
zig cc -target x86_64-windows-gnu $@

zc++

#!/bin/sh
zig c++ -target x86_64-windows-gnu $@

output:

# command-line-arguments
warning: unsupported linker arg: --compress-debug-sections=zlib-gnu

It produces main.exe but when run it segfaults in runtime.rt0_go() (called from main()). Expected output is to print “30” to the console when run in cmd.exe.

Happy to chat on IRC or Discord if anyone has some ideas to try.