cmd/dist: add support for GOARCH=mips{,le}

Change-Id: I6e24d22eada190e9aa2adc161be7a753c8e5054b
Reviewed-on: https://go-review.googlesource.com/31514
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/compile/main.go

@@ -9,6 +9,7 @@ import (
 	"cmd/compile/internal/arm"
 	"cmd/compile/internal/arm64"
 	"cmd/compile/internal/gc"
+	"cmd/compile/internal/mips"
 	"cmd/compile/internal/mips64"
 	"cmd/compile/internal/ppc64"
 	"cmd/compile/internal/s390x"
@@ -36,6 +37,8 @@ func main() {
 		arm.Init()
 	case "arm64":
 		arm64.Init()
+	case "mips", "mipsle":
+		mips.Init()
 	case "mips64", "mips64le":
 		mips64.Init()
 	case "ppc64", "ppc64le":

src/cmd/dist/build.go

@@ -1107,6 +1107,8 @@ var cgoEnabled = map[string]bool{
 	"linux/arm64":     true,
 	"linux/ppc64":     false,
 	"linux/ppc64le":   true,
+	"linux/mips":      false,
+	"linux/mipsle":    false,
 	"linux/mips64":    true,
 	"linux/mips64le":  true,
 	"linux/s390x":     true,

src/cmd/dist/buildtool.go

@@ -37,6 +37,7 @@ var bootstrapDirs = []string{
 	"cmd/compile/internal/arm",
 	"cmd/compile/internal/arm64",
 	"cmd/compile/internal/gc",
+	"cmd/compile/internal/mips",
 	"cmd/compile/internal/mips64",
 	"cmd/compile/internal/ppc64",
 	"cmd/compile/internal/s390x",
@@ -59,6 +60,7 @@ var bootstrapDirs = []string{
 	"cmd/link/internal/arm",
 	"cmd/link/internal/arm64",
 	"cmd/link/internal/ld",
+	"cmd/link/internal/mips",
 	"cmd/link/internal/mips64",
 	"cmd/link/internal/ppc64",
 	"cmd/link/internal/s390x",

src/cmd/dist/util.go

@@ -445,6 +445,11 @@ func main() {
 			if elfIsLittleEndian(os.Args[0]) {
 				gohostarch = "mips64le"
 			}
+		case strings.Contains(out, "mips"):
+			gohostarch = "mips"
+			if elfIsLittleEndian(os.Args[0]) {
+				gohostarch = "mipsle"
+			}
 		case strings.Contains(out, "s390x"):
 			gohostarch = "s390x"
 		case gohostos == "darwin":

src/cmd/link/main.go

@@ -10,6 +10,7 @@ import (
 	"cmd/link/internal/arm"
 	"cmd/link/internal/arm64"
 	"cmd/link/internal/ld"
+	"cmd/link/internal/mips"
 	"cmd/link/internal/mips64"
 	"cmd/link/internal/ppc64"
 	"cmd/link/internal/s390x"
@@ -45,6 +46,8 @@ func main() {
 		arm.Init()
 	case "arm64":
 		arm64.Init()
+	case "mips", "mipsle":
+		mips.Init()
 	case "mips64", "mips64le":
 		mips64.Init()
 	case "ppc64", "ppc64le":