Can't Cross-Compile Go project with Xgo using CGO AMD=> ARM

Getting Help
1

HI ,

I’m working on go project that implmenting C code !
I can build the project on linux/amd64, and we now that go don’t cross compile if we use “IMPORT C”. So i work with XGO that maybe help me to cross compiling for ARM.
i check XGO by cross compiling version of my go project without C code and it’s work like cross compil of go.
my environement :

go version go1.13.3 linux/amd64
Go env :

     GO111MODULE="on"
     GOARCH="amd64"
     GOBIN="/opt/go/bin"
     GOCACHE="/home/jj/.cache/go-build"
     GOENV="/home/jj/.config/go/env"
     GOEXE=""
     GOFLAGS=""
     GOHOSTARCH="amd64"
     GOHOSTOS="linux"
     GONOPROXY=""
     GONOSUMDB=""
     GOOS="linux"
     GOPATH="/opt/go"
     GOPRIVATE=""
     GOPROXY="https://proxy.golang.org,direct"
     GOROOT="/usr/local/go"
     GOSUMDB="sum.golang.org"
     GOTMPDIR=""
     GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
     GCCGO="gccgo"
     AR="ar"
     CC="gcc"
     CXX="g++"
     CGO_ENABLED="1"
     GOMOD="/opt/go/src/github.com/brocaar/lora-app-server/go.mod"
     CGO_CFLAGS="-g -O2"
     CGO_CPPFLAGS=""

My project is on =>

     /opt/go/src/github.com/brocaar

My package that include c code is on =>

    /opt/go/src/github.com/lorawan

the go.mode of my project :

module github.com/brocaar/lora-app-server

go 1.12

replace github.com/brocaar/lorawan => /opt/go/src/github.com/brocaar/lorawan

require (
         cloud.google.com/go v0.44.3
         github.com/Azure/azure-service-bus-go v0.9.1
         github.com/NickBall/go-aes-key-wrap v0.0.0-20170929221519-1c3aa3e4dfc5
         github.com/aws/aws-sdk-go v1.19.19
         github.com/brocaar/loraserver v0.0.0-20190917115647-c4da45f52f2b
         github.com/brocaar/lorawan v0.0.0-20190814113539-8eb2a8d6da09
         github.com/dgrijalva/jwt-go v3.2.0+incompatible
         github.com/eclipse/paho.mqtt.golang v1.2.0
         github.com/elazarl/go-bindata-assetfs v1.0.0
         github.com/gofrs/uuid v3.2.0+incompatible
         github.com/golang/protobuf v1.3.2
         github.com/gomodule/redigo v2.0.0+incompatible
         github.com/goreleaser/goreleaser v0.106.0

        )

My command to cross-compil is:

     xgo -go 1.13.3  --targets=linux/arm-7 /opt/go/src/github.com/brocaar/lora-app-server/cmd/lora-app-server

The result error are :

       src/github.com/brocaar/lora-app-server/cmd/lora-app-server
       Checking docker installation... Client: Version: 18.09.7 API version: 1.39 Go version: go1.10.4 Git 
       commit: 2d0083d Built: Fri Aug 16 14:19:38 2019 OS/Arch: linux/amd64 Experimental: false

       Server:
        Engine:
           Version:          18.09.7
           API version:      1.39 (minimum version 1.12)
           Go version:       go1.10.4
           Git commit:       2d0083d
           Built:            Thu Aug 15 15:12:41 2019
           OS/Arch:          linux/amd64
           Experimental:     false

         Checking for required docker image karalabe/xgo-1.13.3... found.
         Cross compiling github.com/brocaar/lora-app-server/cmd/lora-app-server...
         Building locally github.com/brocaar/lora-app-server/cmd/lora-app-server...
         Bootstrapping linux/arm-7...
         go: github.com/brocaar/lorawan@v0.0.0-20190814113539-8eb2a8d6da09: parsing 
        /opt/go/src/github.com/brocaar/lorawan/go.mod: open 
        /opt/go/src/github.com/brocaar/lorawan/go.mod: no  such file or directory
        2019/12/03 16:02:37 Failed to cross compile package: exit status 1.

I really don’t now why he say “no such file or directory”, because there are go.mod in folder lorawan ! can some one help me ? thanks

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