Create empty monolithic hiddenapi flags files for non java devices.

This is a followup https://r.android.com/3089366 that disabled the
creation of out/soong/hiddenapi/hiddenapi* files for non java device
builds. This works fine for `m`, but `m dist` runs issues since
`f/b/boot/Android.bp` dists these files. For non java devices, the
previous implementation would report missing files during ninja
excecution (https://b.corp.google.com/issues/338363444#comment5)

This CL creates empty files for these so that the dist tags can always
be resolved.

Bug: 338363444
Test: lunch aosp_cf_x86_64_minidroid-trunk_staging-userdebug && m dist
Change-Id: Ice2d970a164246753da89a6a06dfd28a627a272d

1 files changed, 12 insertions, 7 deletions

diff --git a/java/platform_bootclasspath.go b/java/platform_bootclasspath.go
index 0f87b2745..8d4cf6823 100644
--- a/java/platform_bootclasspath.go
+++ b/java/platform_bootclasspath.go
@@ -294,6 +294,15 @@ func (b *platformBootclasspathModule) checkApexModules(ctx android.ModuleContext
 
 // generateHiddenAPIBuildActions generates all the hidden API related build rules.
 func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.ModuleContext, modules []android.Module, fragments []android.Module) bootDexJarByModule {
+	createEmptyHiddenApiFiles := func() {
+		paths := android.OutputPaths{b.hiddenAPIFlagsCSV, b.hiddenAPIIndexCSV, b.hiddenAPIMetadataCSV}
+		for _, path := range paths {
+			ctx.Build(pctx, android.BuildParams{
+				Rule:   android.Touch,
+				Output: path,
+			})
+		}
+	}
 
 	// Save the paths to the monolithic files for retrieval via OutputFiles().
 	b.hiddenAPIFlagsCSV = hiddenAPISingletonPaths(ctx).flags
@@ -306,13 +315,7 @@ func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.
 	// optimization that can be used to reduce the incremental build time but as its name suggests it
 	// can be unsafe to use, e.g. when the changes affect anything that goes on the bootclasspath.
 	if ctx.Config().DisableHiddenApiChecks() {
-		paths := android.OutputPaths{b.hiddenAPIFlagsCSV, b.hiddenAPIIndexCSV, b.hiddenAPIMetadataCSV}
-		for _, path := range paths {
-			ctx.Build(pctx, android.BuildParams{
-				Rule:   android.Touch,
-				Output: path,
-			})
-		}
+		createEmptyHiddenApiFiles()
 		return bootDexJarByModule
 	}
 
@@ -327,6 +330,8 @@ func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.
 
 	if len(classesJars) == 0 {
 		// This product does not include any monolithic jars. Monolithic hiddenapi flag generation is not required.
+		// However, generate an empty file so that the dist tags in f/b/boot/Android.bp can be resolved, and `m dist` works.
+		createEmptyHiddenApiFiles()
 		return bootDexJarByModule
 	}