Remove the unused `tags` property

And fix up androidmk / bpfix to provide warnings about what to do
instead.

Test: m blueprint_tools  (runs the tests, ensures there aren't any tags left)
Change-Id: I1a3ad8600211050420041740207d6957f44463c8

android/module.go

@@ -191,8 +191,6 @@ type nameProperties struct {
 }
 
 type commonProperties struct {
-	Tags []string
-
 	// emit build rules for this module
 	Enabled *bool `android:"arch_variant"`
 

androidmk/cmd/androidmk/androidmk_test.go

@@ -331,7 +331,7 @@ cc_library_shared {
 `,
 	},
 	{
-		desc: "Keep LOCAL_MODULE_TAGS non-optional",
+		desc: "Warn for LOCAL_MODULE_TAGS non-optional",
 		in: `
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := debug
@@ -340,7 +340,41 @@ include $(BUILD_SHARED_LIBRARY)
 
 		expected: `
 cc_library_shared {
-	tags: ["debug"],
+	// WARNING: Module tags are not supported in Soong.
+	// Add this module to PRODUCT_PACKAGES_DEBUG in your product file if you want to
+	// force installation for -userdebug and -eng builds.
+}
+`,
+	},
+	{
+		desc: "Custom warning for LOCAL_MODULE_TAGS tests",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := debug tests
+include $(BUILD_SHARED_LIBRARY)
+`,
+
+		expected: `
+cc_library_shared {
+	// WARNING: Module tags are not supported in Soong.
+	// Add this module to PRODUCT_PACKAGES_DEBUG in your product file if you want to
+	// force installation for -userdebug and -eng builds.
+	// WARNING: Module tags are not supported in Soong.
+	// To make a shared library only for tests, use the "cc_test_library" module
+	// type. If you don't use gtest, set "gtest: false".
+}
+`,
+	},
+	{
+		desc: "Ignore LOCAL_MODULE_TAGS tests for cc_test",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := tests
+include $(BUILD_NATIVE_TEST)
+`,
+
+		expected: `
+cc_test {
 }
 `,
 	},

bpfix/bpfix/bpfix.go

@@ -50,6 +50,7 @@ type FixRequest struct {
 	rewriteIncorrectAndroidmkAndroidLibraries bool
 	mergeMatchingModuleProperties             bool
 	reorderCommonProperties                   bool
+	removeTags                                bool
 }
 
 func NewFixRequest() FixRequest {
@@ -63,6 +64,7 @@ func (r FixRequest) AddAll() (result FixRequest) {
 	result.rewriteIncorrectAndroidmkAndroidLibraries = true
 	result.mergeMatchingModuleProperties = true
 	result.reorderCommonProperties = true
+	result.removeTags = true
 	return result
 }
 
@@ -180,6 +182,13 @@ func (f *Fixer) fixTreeOnce(config FixRequest) error {
 			return err
 		}
 	}
+
+	if config.removeTags {
+		err := f.runPatchListMod(removeTags)
+		if err != nil {
+			return err
+		}
+	}
 	return nil
 }
 
@@ -352,6 +361,72 @@ func reorderCommonProperties(mod *parser.Module, buf []byte, patchlist *parser.P
 	return nil
 }
 
+func removeTags(mod *parser.Module, buf []byte, patchlist *parser.PatchList) error {
+	prop, ok := mod.GetProperty("tags")
+	if !ok {
+		return nil
+	}
+	list, ok := prop.Value.(*parser.List)
+	if !ok {
+		return nil
+	}
+
+	replaceStr := ""
+
+	for _, item := range list.Values {
+		str, ok := item.(*parser.String)
+		if !ok {
+			replaceStr += fmt.Sprintf("// ERROR: Unable to parse tag %q\n", item)
+			continue
+		}
+
+		switch str.Value {
+		case "optional":
+			continue
+		case "debug":
+			replaceStr += `// WARNING: Module tags are not supported in Soong.
+				// Add this module to PRODUCT_PACKAGES_DEBUG in your product file if you want to
+				// force installation for -userdebug and -eng builds.
+				`
+		case "eng":
+			replaceStr += `// WARNING: Module tags are not supported in Soong.
+				// Add this module to PRODUCT_PACKAGES_ENG in your product file if you want to
+				// force installation for -eng builds.
+				`
+		case "tests":
+			if strings.Contains(mod.Type, "cc_test") || strings.Contains(mod.Type, "cc_library_static") {
+				continue
+			} else if strings.Contains(mod.Type, "cc_lib") {
+				replaceStr += `// WARNING: Module tags are not supported in Soong.
+					// To make a shared library only for tests, use the "cc_test_library" module
+					// type. If you don't use gtest, set "gtest: false".
+					`
+			} else if strings.Contains(mod.Type, "cc_bin") {
+				replaceStr += `// WARNING: Module tags are not supported in Soong.
+					// For native test binaries, use the "cc_test" module type. Some differences:
+					//  - If you don't use gtest, set "gtest: false"
+					//  - Binaries will be installed into /data/nativetest[64]/<name>/<name>
+					//  - Both 32 & 64 bit versions will be built (as appropriate)
+					`
+			} else if strings.Contains(mod.Type, "java_lib") {
+				replaceStr += `// WARNING: Module tags are not supported in Soong.
+					// For JUnit or similar tests, use the "java_test" module type. A dependency on
+					// Junit will be added by default, if it is using some other runner, set "junit: false".
+					`
+			} else {
+				replaceStr += `// WARNING: Module tags are not supported in Soong.
+					// In most cases, tests are now identified by their module type:
+					// cc_test, java_test, python_test
+					`
+			}
+		default:
+			replaceStr += fmt.Sprintf("// WARNING: Unknown module tag %q\n", str.Value)
+		}
+	}
+
+	return patchlist.Add(prop.Pos().Offset, prop.End().Offset+2, replaceStr)
+}
+
 func mergeMatchingModuleProperties(mod *parser.Module, buf []byte, patchlist *parser.PatchList) error {
 	return mergeMatchingProperties(&mod.Properties, buf, patchlist)
 }

cc/cc.go

@@ -206,10 +206,6 @@ type VendorProperties struct {
 	Double_loadable *bool
 }
 
-type UnusedProperties struct {
-	Tags []string
-}
-
 type ModuleContextIntf interface {
 	static() bool
 	staticBinary() bool
@@ -320,7 +316,6 @@ type Module struct {
 
 	Properties       BaseProperties
 	VendorProperties VendorProperties
-	unused           UnusedProperties
 
 	// initialize before calling Init
 	hod      android.HostOrDeviceSupported
@@ -360,7 +355,7 @@ type Module struct {
 }
 
 func (c *Module) Init() android.Module {
-	c.AddProperties(&c.Properties, &c.VendorProperties, &c.unused)
+	c.AddProperties(&c.Properties, &c.VendorProperties)
 	if c.compiler != nil {
 		c.AddProperties(c.compiler.compilerProps()...)
 	}
@@ -1475,7 +1470,6 @@ func DefaultsFactory(props ...interface{}) android.Module {
 		&BinaryLinkerProperties{},
 		&TestProperties{},
 		&TestBinaryProperties{},
-		&UnusedProperties{},
 		&StlProperties{},
 		&SanitizeProperties{},
 		&StripProperties{},