Add cross-compilation Github workflow

Signed-off-by: Chris Koch <[email protected]>

.github/workflows/go.yml

@@ -15,6 +15,22 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  cross_build:
+    name: Cross-platform builds
+    strategy:
+      matrix:
+        go-version: ['1.21.x']
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Cross-compile
+        run: ./cross-compile.sh
+
   build_and_test:
     name: Build and test
     strategy:

cross-compile.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -eu
+
+GO="go"
+if [ -v GOROOT ];
+then
+  GO="$GOROOT/bin/go"
+fi
+
+function buildem() {
+  for GOOS in $1
+  do
+    for GOARCH in $2
+    do
+      echo "Building $GOOS/$GOARCH..."
+      GOOS=$GOOS GOARCH=$GOARCH $GO build ./...
+    done
+  done
+}
+
+GOARCHES="386 amd64 arm arm64 ppc64 ppc64le s390x mips mipsle mips64 mips64le"
+buildem "linux" "$GOARCHES"
+
+GOARCHES="386 amd64 arm arm64"
+GOOSES="freebsd" # TBD netbsd openbsd windows
+buildem "$GOOSES" "$GOARCHES"
+
+GOARCHES_DARWIN="arm64 amd64"
+buildem "darwin" "$GOARCHES_DARWIN"