Fixed release builds to disable cgo and explicitly target baseline x86-64

.github/workflows/go.yml

@@ -29,5 +29,12 @@ jobs:
       - name: Test
         run: go test -v ./... --cover
 
+      - name: Test Linux release on a CPU without AVX
+        run: |
+          sudo apt-get update
+          sudo apt-get install --no-install-recommends -y qemu-user
+          go run github.com/magefile/mage build linux64
+          qemu-x86_64 -cpu qemu64 ./coreander --help
+
       - name: Test JavaScript
         run: node --test internal/webserver/js-tests/*.test.mjs

README.md

@@ -37,6 +37,8 @@ There are two possibilities for building Coreander from source:
 * If you have [Mage](https://magefile.org) installed in your system, just type `mage install` from the source code folder.
 * Otherwise, a simple `go build` or `go install` will do, although no version information will be added to the executable.
 
+Release builds (`mage build <platform>` or `mage release`) disable cgo and explicitly target the baseline `GOAMD64=v1` on x86-64, so they do not depend on the build machine's native C compiler CPU settings. For an equivalent portable Linux x86-64 build from source, use `CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOAMD64=v1 go build`.
+
 Reader interaction regression tests can be run with Node.js using its built-in test runner: `node --test internal/webserver/js-tests/*.test.mjs`.
 
 ## How to use

magefile.go

@@ -71,53 +71,33 @@ func binaryName(platform string) string {
 }
 
 func env(platform string) (map[string]string, error) {
-	env := map[string]string{}
+	env := map[string]string{"CGO_ENABLED": "0"}
 
 	switch platform {
 	case "linux32":
-		return map[string]string{
-			"GOOS":   "linux",
-			"GOARCH": "386",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "linux", "386"
 	case "linux64":
-		return map[string]string{
-			"GOOS":   "linux",
-			"GOARCH": "amd64",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "linux", "amd64"
 	case "linuxarm32":
-		return map[string]string{
-			"GOOS":   "linux",
-			"GOARCH": "arm",
-			"GOARM":  "7",
-		}, nil
+		env["GOOS"], env["GOARCH"], env["GOARM"] = "linux", "arm", "7"
 	case "linuxarm64":
-		return map[string]string{
-			"GOOS":   "linux",
-			"GOARCH": "arm64",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "linux", "arm64"
 	case "osxintel":
-		return map[string]string{
-			"GOOS":   "darwin",
-			"GOARCH": "amd64",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "darwin", "amd64"
 	case "osxapple":
-		return map[string]string{
-			"GOOS":   "darwin",
-			"GOARCH": "arm64",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "darwin", "arm64"
 	case "win32":
-		return map[string]string{
-			"GOOS":   "windows",
-			"GOARCH": "386",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "windows", "386"
 	case "win64":
-		return map[string]string{
-			"GOOS":   "windows",
-			"GOARCH": "amd64",
-		}, nil
+		env["GOOS"], env["GOARCH"] = "windows", "amd64"
+	default:
+		return nil, fmt.Errorf("Platform '%s' not supported", platform)
 	}
 
-	return env, fmt.Errorf("Platform '%s' not supported", platform)
+	if env["GOARCH"] == "amd64" {
+		env["GOAMD64"] = "v1"
+	}
+	return env, nil
 }
 
 func createZip(fileName, zipFileName string) error {