Fix arch specific properties for java modules

Arch specific properties were not being applied to modules
with OS set to Common.

Test: java_test.go
Change-Id: I8f1b49ca51b0cf96f78006dfcd121672e581d9c5

android/arch.go

@@ -597,10 +597,6 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 	arch := a.Arch()
 	os := a.Os()
 
-	if arch.ArchType == Common {
-		return
-	}
-
 	for i := range a.generalProperties {
 		genProps := a.generalProperties[i]
 		if a.archProperties[i] == nil {
@@ -612,6 +608,9 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 		multilibProp := archProps.FieldByName("Multilib")
 		targetProp := archProps.FieldByName("Target")
 
+		var field string
+		var prefix string
+
 		// Handle arch-specific properties in the form:
 		// arch: {
 		//     arm64: {
@@ -620,6 +619,7 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 		// },
 		t := arch.ArchType
 
+		if arch.ArchType != Common {
 			field := proptools.FieldNameForProperty(t.Name)
 			prefix := "arch." + t.Name
 			archStruct := a.appendProperties(ctx, genProps, archProp, field, prefix)
@@ -673,6 +673,7 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 			field = proptools.FieldNameForProperty(t.Multilib)
 			prefix = "multilib." + t.Multilib
 			a.appendProperties(ctx, genProps, multilibProp, field, prefix)
+		}
 
 		// Handle host-specific properties in the form:
 		// target: {
@@ -700,20 +701,24 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 			prefix = "target.linux"
 			a.appendProperties(ctx, genProps, targetProp, field, prefix)
 
-			field = "Linux_" + t.Name
+			if arch.ArchType != Common {
-			prefix = "target.linux_" + t.Name
+				field = "Linux_" + arch.ArchType.Name
+				prefix = "target.linux_" + arch.ArchType.Name
 				a.appendProperties(ctx, genProps, targetProp, field, prefix)
 			}
+		}
 
 		if os.Bionic() {
 			field = "Bionic"
 			prefix = "target.bionic"
 			a.appendProperties(ctx, genProps, targetProp, field, prefix)
 
+			if arch.ArchType != Common {
 				field = "Bionic_" + t.Name
 				prefix = "target.bionic_" + t.Name
 				a.appendProperties(ctx, genProps, targetProp, field, prefix)
 			}
+		}
 
 		// Handle target OS properties in the form:
 		// target: {
@@ -743,9 +748,11 @@ func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
 		prefix = "target." + os.Name
 		a.appendProperties(ctx, genProps, targetProp, field, prefix)
 
+		if arch.ArchType != Common {
 			field = os.Field + "_" + t.Name
 			prefix = "target." + os.Name + "_" + t.Name
 			a.appendProperties(ctx, genProps, targetProp, field, prefix)
+		}
 
 		if (os.Class == Host || os.Class == HostCross) && os != Windows {
 			field := "Not_windows"

java/java_test.go

@@ -164,6 +164,25 @@ func TestSimple(t *testing.T) {
 	}
 }
 
+func TestArchSpecific(t *testing.T) {
+	ctx := testJava(t, `
+		java_library {
+			name: "foo",
+			srcs: ["a.java"],
+			target: {
+				android: {
+					srcs: ["b.java"],
+				},
+			},
+		}
+	`)
+
+	javac := ctx.ModuleForTests("foo", "android_common").Rule("javac")
+	if len(javac.Inputs) != 2 || javac.Inputs[0].String() != "a.java" || javac.Inputs[1].String() != "b.java" {
+		t.Errorf(`foo inputs %v != ["a.java", "b.java"]`, javac.Inputs)
+	}
+}
+
 var classpathTestcases = []struct {
 	name          string
 	host          android.OsClass