Merge "Add a better error message for missing api files"

// Add other dependencies as normal.

func (module *SdkLibrary) DepsMutator(ctx android.BottomUpMutatorContext) {

	var missingApiModules []string

	for _, apiScope := range module.getGeneratedApiScopes(ctx) {

		if apiScope.unstable {

			continue

		}

		if m := android.SrcIsModule(module.latestApiFilegroupName(apiScope)); !ctx.OtherModuleExists(m) {

			missingApiModules = append(missingApiModules, m)

		}

		if m := android.SrcIsModule(module.latestRemovedApiFilegroupName(apiScope)); !ctx.OtherModuleExists(m) {

			missingApiModules = append(missingApiModules, m)

		}

	}

	if len(missingApiModules) != 0 && !module.sdkLibraryProperties.Unsafe_ignore_missing_latest_api {

		m := module.Name() + " is missing tracking files for previously released library versions.\n"

		m += "You need to do one of the following:\n"

		m += "- Add `unsafe_ignore_missing_latest_api: true` to your blueprint (to disable compat tracking)\n"

		m += "- Add a set of prebuilt txt files representing the last released version of this library for compat checking.\n"

		m += "  (the current set of API files can be used as a seed for this compatibility tracking\n"

		m += "\n"

		m += "The following filegroup modules are missing:\n  "

		m += strings.Join(missingApiModules, "\n  ") + "\n"

		m += "Please see the documentation of the prebuilt_apis module type (and a usage example in prebuilts/sdk) for a convenient way to generate these."

		ctx.ModuleErrorf(m)

	}

	if module.requiresRuntimeImplementationLibrary() {

		// Only add the deps for the library if it is actually going to be built.

		module.Library.deps(ctx)