Fix installing prebuilts with no source module

Prebuilts that were not overriding a source module would never
get UsePrebuilt set, which would cause SkipInstall() to be called,
and prevent the module from being exported to make.

Test: prebuilt_test.go
Change-Id: Ib09300efff26f09245331e9919ae2db82b0c3625

android/prebuilt.go

@@ -76,10 +76,15 @@ func prebuiltMutator(ctx BottomUpMutatorContext) {
 	}
 }
 
-// PrebuiltSelectModuleMutator marks prebuilts that are overriding source modules, and disables
-// installing the source module.
+// PrebuiltSelectModuleMutator marks prebuilts that are used, either overriding source modules or
+// because the source module doesn't exist.  It also disables installing overridden source modules.
 func PrebuiltSelectModuleMutator(ctx TopDownMutatorContext) {
-	if s, ok := ctx.Module().(Module); ok {
+	if m, ok := ctx.Module().(PrebuiltInterface); ok && m.Prebuilt() != nil {
+		p := m.Prebuilt()
+		if !p.Properties.SourceExists {
+			p.Properties.UsePrebuilt = p.usePrebuilt(ctx, nil)
+		}
+	} else if s, ok := ctx.Module().(Module); ok {
 		ctx.VisitDirectDeps(func(m blueprint.Module) {
 			if ctx.OtherModuleDependencyTag(m) == prebuiltDepTag {
 				p := m.(PrebuiltInterface).Prebuilt()
@@ -121,5 +126,5 @@ func (p *Prebuilt) usePrebuilt(ctx TopDownMutatorContext, source Module) bool {
 		return true
 	}
 
-	return !source.Enabled()
+	return source == nil || !source.Enabled()
 }

android/prebuilt_test.go

@@ -144,20 +144,33 @@ func TestPrebuilts(t *testing.T) {
 				t.Fatalf("failed to find module foo")
 			}
 
+			var dependsOnSourceModule, dependsOnPrebuiltModule bool
+			ctx.VisitDirectDeps(foo, func(m blueprint.Module) {
+				if _, ok := m.(*sourceModule); ok {
+					dependsOnSourceModule = true
+				}
+				if p, ok := m.(*prebuiltModule); ok {
+					dependsOnPrebuiltModule = true
+					if !p.Prebuilt().Properties.UsePrebuilt {
+						t.Errorf("dependency on prebuilt module not marked used")
+					}
+				}
+			})
+
 			if test.prebuilt {
-				if !foo.(*sourceModule).dependsOnPrebuiltModule {
+				if !dependsOnPrebuiltModule {
 					t.Errorf("doesn't depend on prebuilt module")
 				}
 
-				if foo.(*sourceModule).dependsOnSourceModule {
+				if dependsOnSourceModule {
 					t.Errorf("depends on source module")
 				}
 			} else {
-				if foo.(*sourceModule).dependsOnPrebuiltModule {
+				if dependsOnPrebuiltModule {
 					t.Errorf("depends on prebuilt module")
 				}
 
-				if !foo.(*sourceModule).dependsOnSourceModule {
+				if !dependsOnSourceModule {
 					t.Errorf("doens't depend on source module")
 				}
 			}
@@ -209,14 +222,6 @@ func (s *sourceModule) DepsMutator(ctx BottomUpMutatorContext) {
 }
 
 func (s *sourceModule) GenerateAndroidBuildActions(ctx ModuleContext) {
-	ctx.VisitDirectDeps(func(m blueprint.Module) {
-		if _, ok := m.(*sourceModule); ok {
-			s.dependsOnSourceModule = true
-		}
-		if _, ok := m.(*prebuiltModule); ok {
-			s.dependsOnPrebuiltModule = true
-		}
-	})
 }
 
 func findModule(ctx *blueprint.Context, name string) blueprint.Module {