release/dist/synology: add GOARM=7,softfloat mode for hi3535

Fixes #6860

Change-Id: I36f3101e75dab35d03e76693555ac93da893f8d5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

flakehashes.json

@@ -1,7 +1,7 @@
 {
   "toolchain": {
-    "rev": "e877d973840c91ec9d4bc1921b0845789de359ae",
+    "rev": "7104161f96b07474ce312ea116c8b2a1efe1311a",
-    "sri": "sha256-HeD70CytKL0Ks/VDqMU73bN8fxpWkNc6mNgNr9PEO7k="
+    "sri": "sha256-uskKJHUzzIQ74VuzoQKrlz+6tCY/YKnv+BjJduPwt6Q="
   },
   "vendor": {
     "goModSum": "sha256-EU/dC6ei0SKQJUBAkRseCLkaU2YLPS7EBJxCqXxEfm8=",

go.toolchain.next.rev

@@ -1 +1 @@
-e877d973840c91ec9d4bc1921b0845789de359ae
+7104161f96b07474ce312ea116c8b2a1efe1311a

go.toolchain.rev

@@ -1 +1 @@
-e877d973840c91ec9d4bc1921b0845789de359ae
+7104161f96b07474ce312ea116c8b2a1efe1311a

release/dist/synology/targets.go

@@ -9,10 +9,6 @@ var v5Models = []string{
 	"armv5",
 	"88f6281",
 	"88f6282",
-	// hi3535 is actually an armv7 under the hood, but with no
-	// hardware floating point. To the Go compiler, that means it's an
-	// armv5.
-	"hi3535",
 }
 
 var v7Models = []string{
@@ -26,6 +22,13 @@ var v7Models = []string{
 	"monaco",
 }
 
+// These models are actually armv7 under the hood, but with no hardware
+// floating point. To the Go compiler, that means we previously treated
+// them as GOARM=5 just to get softfloat, but nowadays we can do GOARM=7,softfloat.
+var v7SoftModels = []string{
+	"hi3535", // https://github.com/tailscale/tailscale/issues/6860
+}
+
 func Targets(forPackageCenter bool, signer dist.Signer) []dist.Target {
 	var ret []dist.Target
 	for _, dsmVersion := range []struct {
@@ -105,6 +108,20 @@ func Targets(forPackageCenter bool, signer dist.Signer) []dist.Target {
 				signer:        signer,
 			})
 		}
+		for _, v7SoftArch := range v7SoftModels {
+			ret = append(ret, &target{
+				filenameArch:    v7SoftArch,
+				dsmMajorVersion: dsmVersion.major,
+				dsmMinorVersion: dsmVersion.minor,
+				goenv: map[string]string{
+					"GOOS":   "linux",
+					"GOARCH": "arm",
+					"GOARM":  "7,softfloat",
+				},
+				packageCenter: forPackageCenter,
+				signer:        signer,
+			})
+		}
 	}
 	return ret
 }