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Add support for GOARM parameter when cross compiling

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Go can cross compile to older ARM architectures (e.g. v5). In order to
do so one needs to use the GOARM parameter as documented in
https://github.com/golang/go/wiki/GoArm
This commit is contained in:
Jean-François Paris 2018-02-04 14:06:13 +00:00
parent aa333f4d49
commit e86fb5eedd
2 changed files with 12 additions and 2 deletions
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12
build.go
View File

@ -193,6 +193,7 @@ func showUsage(output io.Writer) {
fmt.Fprintf(output, " --enable-cgo use CGO to link against libc\n")
fmt.Fprintf(output, " --goos value set GOOS for cross-compilation\n")
fmt.Fprintf(output, " --goarch value set GOARCH for cross-compilation\n")
fmt.Fprintf(output, " --goarm value set GOARM for cross-compilation\n")
}
func verbosePrintf(message string, args ...interface{}) {
@ -218,13 +219,16 @@ func cleanEnv() (env []string) {
}
// build runs "go build args..." with GOPATH set to gopath.
func build(cwd, goos, goarch, gopath string, args ...string) error {
func build(cwd, goos, goarch, goarm, gopath string, args ...string) error {
a := []string{"build"}
a = append(a, "-asmflags", fmt.Sprintf("-trimpath=%s", gopath))
a = append(a, "-gcflags", fmt.Sprintf("-trimpath=%s", gopath))
a = append(a, args...)
cmd := exec.Command("go", a...)
cmd.Env = append(cleanEnv(), "GOPATH="+gopath, "GOARCH="+goarch, "GOOS="+goos)
if goarm != "" {
cmd.Env = append(cmd.Env, "GOARM="+goarm)
}
if !enableCGO {
cmd.Env = append(cmd.Env, "CGO_ENABLED=0")
}
@ -397,6 +401,7 @@ func main() {
targetGOOS := runtime.GOOS
targetGOARCH := runtime.GOARCH
targetGOARM := ""
var outputFilename string
@ -430,6 +435,9 @@ func main() {
case "--goarch":
skipNext = true
targetGOARCH = params[i+1]
case "--goarm":
skipNext = true
targetGOARM = params[i+1]
case "-h":
showUsage(os.Stdout)
return
@ -514,7 +522,7 @@ func main() {
"-o", output, config.Main,
}
err = build(filepath.Join(gopath, "src"), targetGOOS, targetGOARCH, gopath, args...)
err = build(filepath.Join(gopath, "src"), targetGOOS, targetGOARCH, targetGOARM, gopath, args...)
if err != nil {
die("build failed: %v\n", err)
}

2
doc/020_installation.rst
View File

@ -113,6 +113,8 @@ supply the target OS and platform via the command-line options like this
$ go run build.go --goos freebsd --goarch 386
$ go run build.go --goos linux --goarch arm --goarm 6
The resulting binary is statically linked and does not require any
libraries.