WIP: use gox for cross platform compiling, try to enable cross platform cgo builds

.travis.yml

@@ -1,11 +1,19 @@
 language: go
-sudo: false
+dist: bionic
+sudo: required
 go:
-  - tip # Latest go version
+  - 1.16.x # Latest go version
+env:
+  - azure-linux
+  - GO111MODULE=on
+addons:
+  apt:
+    packages:
+      - gcc-multilib
 
 before_install:
   # gox simplifies building for multiple architectures
-  - go get github.com/mitchellh/gox
+  - go get github.com/necrose99/gox
 
 install:
   - # skip
@@ -14,7 +22,8 @@ script:
   - go get -t -v ./...
   - diff -u <(echo -n) <(gofmt -d .)
   - go vet $(go list ./... | grep -v /vendor/)
-  - gox -cgo -os="linux" -arch="amd64 arm arm64" -output="dist/{{.Dir}}_{{.OS}}_{{.Arch}}" -ldflags "-X main.Version=`git rev-parse --short HEAD`" -verbose ./...
+  - sudo -E apt-get -yq --no-install-suggests --no-install-recommends --force-yes install gcc-arm-linux-gnueabi libc6-dev-armel-cross gcc-arm-linux-gnueabihf libc6-dev-armhf-cross gcc-aarch64-linux-gnu libc6-dev-arm64-cross
+  - GOX_linux_arm_LDFLAGS="-linkmode external -extldflags -static" GOX_linux_arm_CC=arm-linux-gnueabi-gcc GOX_linux_arm64_LDFLAGS="-linkmode external -extldflags -static" GOX_linux_arm64_CC=aarch64-linux-gnu-gcc gox -rebuild -parallel=1 -verbose -cgo -os="linux" -arch="amd64 arm arm64" -output="dist/{{.Dir}}_{{.OS}}_{{.Arch}}" -ldflags "-X main.Version=`git rev-parse --short HEAD`" -verbose ./...
 
 deploy:
   provider: releases