Merge "Allow cc.LinkabeInterfaces to request "" variants."

cc/cc.go

@@ -562,6 +562,10 @@ func (c *Module) CcLibraryInterface() bool {
 	return false
 }
 
+func (c *Module) NonCcVariants() bool {
+	return false
+}
+
 func (c *Module) SetBuildStubs() {
 	if c.linker != nil {
 		if library, ok := c.linker.(*libraryDecorator); ok {

cc/library.go

@@ -1262,13 +1262,15 @@ func LinkageMutator(mctx android.BottomUpMutatorContext) {
 			shared.linker.(prebuiltLibraryInterface).disablePrebuilt()
 		}
 	} else if library, ok := mctx.Module().(LinkableInterface); ok && library.CcLibraryInterface() {
-		if library.BuildStaticVariant() && library.BuildSharedVariant() {
-			variations := []string{"static", "shared"}
 
-			// Non-cc.Modules need an empty variant for their mutators.
-			if _, ok := mctx.Module().(*Module); !ok {
-				variations = append(variations, "")
-			}
+		// Non-cc.Modules may need an empty variant for their mutators.
+		variations := []string{}
+		if library.NonCcVariants() {
+			variations = append(variations, "")
+		}
+
+		if library.BuildStaticVariant() && library.BuildSharedVariant() {
+			variations := append([]string{"static", "shared"}, variations...)
 
 			modules := mctx.CreateLocalVariations(variations...)
 			static := modules[0].(LinkableInterface)
@@ -1281,16 +1283,18 @@ func LinkageMutator(mctx android.BottomUpMutatorContext) {
 				reuseStaticLibrary(mctx, static.(*Module), shared.(*Module))
 			}
 		} else if library.BuildStaticVariant() {
-			modules := mctx.CreateLocalVariations("static")
+			variations := append([]string{"static"}, variations...)
+
+			modules := mctx.CreateLocalVariations(variations...)
 			modules[0].(LinkableInterface).SetStatic()
 		} else if library.BuildSharedVariant() {
-			modules := mctx.CreateLocalVariations("shared")
-			modules[0].(LinkableInterface).SetShared()
-		} else if _, ok := mctx.Module().(*Module); !ok {
-			// Non-cc.Modules need an empty variant for their mutators.
-			mctx.CreateLocalVariations("")
-		}
+			variations := append([]string{"shared"}, variations...)
 
+			modules := mctx.CreateLocalVariations(variations...)
+			modules[0].(LinkableInterface).SetShared()
+		} else if len(variations) > 0 {
+			mctx.CreateLocalVariations(variations...)
+		}
 	}
 }
 

cc/linkable.go

@@ -20,6 +20,8 @@ type LinkableInterface interface {
 	HasStaticVariant() bool
 	GetStaticVariant() LinkableInterface
 
+	NonCcVariants() bool
+
 	StubsVersions() []string
 	BuildStubs() bool
 	SetBuildStubs()

rust/rust.go

@@ -89,6 +89,19 @@ func (mod *Module) SelectedStl() string {
 	return ""
 }
 
+func (mod *Module) NonCcVariants() bool {
+	if mod.compiler != nil {
+		if library, ok := mod.compiler.(libraryInterface); ok {
+			if library.buildRlib() || library.buildDylib() {
+				return true
+			} else {
+				return false
+			}
+		}
+	}
+	panic(fmt.Errorf("NonCcVariants called on non-library module: %q", mod.BaseModuleName()))
+}
+
 func (mod *Module) ApiLevel() string {
 	panic(fmt.Errorf("Called ApiLevel on Rust module %q; stubs libraries are not yet supported.", mod.BaseModuleName()))
 }