Stubs dependency is not installed

When the stubs variant of a library is dependend by a platform component
and the library is included in one or more APEX, the library is not
installed to the platform, because it is provided by APEX.

Bug: 120266448
Test: m
Test: add stubs: { versions: ["1"], }, to libnetd_resolv
then build netd. libnetd_resolv.so does not exist under /system.

Change-Id: I09b78e38df285033ef6e9c85f7ea4b0274e85070

android/apex.go

@@ -158,6 +158,14 @@ func DirectlyInAnyApex(config Config, moduleName string) bool {
 	return false
 }
 
+// Tests if moduleName is included in any APEX.
+func InAnyApex(config Config, moduleName string) bool {
+	bundleNamesMapMutex.Lock()
+	defer bundleNamesMapMutex.Unlock()
+	bundleNames, ok := apexBundleNamesMap(config)[moduleName]
+	return ok && len(bundleNames) > 0
+}
+
 func InitApexModule(m ApexModule) {
 	base := m.apexModuleBase()
 	base.canHaveApexVariants = true

cc/androidmk.go

@@ -76,6 +76,9 @@ func (c *Module) AndroidMk() android.AndroidMkData {
 				if len(c.Properties.AndroidMkWholeStaticLibs) > 0 {
 					fmt.Fprintln(w, "LOCAL_WHOLE_STATIC_LIBRARIES := "+strings.Join(c.Properties.AndroidMkWholeStaticLibs, " "))
 				}
+				if len(c.Properties.ApexesProvidingSharedLibs) > 0 {
+					fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES := "+strings.Join(c.Properties.ApexesProvidingSharedLibs, " "))
+				}
 				fmt.Fprintln(w, "LOCAL_SOONG_LINK_TYPE :=", c.getMakeLinkType())
 				if c.useVndk() {
 					fmt.Fprintln(w, "LOCAL_USE_VNDK := true")

cc/cc.go

@@ -189,6 +189,7 @@ type BaseProperties struct {
 	AndroidMkWholeStaticLibs  []string `blueprint:"mutated"`
 	HideFromMake              bool     `blueprint:"mutated"`
 	PreventInstall            bool     `blueprint:"mutated"`
+	ApexesProvidingSharedLibs []string `blueprint:"mutated"`
 
 	UseVndk bool `blueprint:"mutated"`
 
@@ -1579,6 +1580,22 @@ func (c *Module) depsToPaths(ctx android.ModuleContext) PathDeps {
 		// Export the shared libs to Make.
 		switch depTag {
 		case sharedDepTag, sharedExportDepTag, lateSharedDepTag:
+			// Dependency to the stubs lib which is already included in an APEX
+			// is not added to the androidmk dependency
+			if dependentLibrary, ok := ccDep.linker.(*libraryDecorator); ok {
+				depNameWithTarget := depName + "-" + ccDep.Target().String()
+				if dependentLibrary.buildStubs() && android.InAnyApex(ctx.Config(), depNameWithTarget) {
+					// Also add the dependency to the APEX(es) providing the library so that
+					// m <module> can trigger building the APEXes as well.
+					apexNames := android.GetApexBundlesForModule(ctx, depNameWithTarget)
+					for an := range apexNames {
+						c.Properties.ApexesProvidingSharedLibs = append(
+							c.Properties.ApexesProvidingSharedLibs, an)
+					}
+					break
+				}
+			}
+
 			// Note: the order of libs in this list is not important because
 			// they merely serve as Make dependencies and do not affect this lib itself.
 			c.Properties.AndroidMkSharedLibs = append(