Disable boot jars package check if no boot jars have been configured

Some build configurations do not configure boot jars. In those cases
the boot jars package check fails so should be skipped.

Bug: 177892522
Test: m nothing
      lunch fvp_mini && m
Change-Id: I5498a8f5cdfb2fabf5223e94dfcee0e853059d01

1 files changed, 6 insertions, 1 deletions

diff --git a/java/boot_jars.go b/java/boot_jars.go
index 86ebe36b4..5d40ec389 100644
--- a/java/boot_jars.go
+++ b/java/boot_jars.go
@@ -31,13 +31,18 @@ func isActiveModule(module android.Module) bool {
 // buildRuleForBootJarsPackageCheck generates the build rule to perform the boot jars package
 // check.
 func buildRuleForBootJarsPackageCheck(ctx android.ModuleContext, bootDexJarByModule bootDexJarByModule) {
+	bootDexJars := bootDexJarByModule.bootDexJarsWithoutCoverage()
+	if len(bootDexJars) == 0 {
+		return
+	}
+
 	timestamp := android.PathForOutput(ctx, "boot-jars-package-check/stamp")
 
 	rule := android.NewRuleBuilder(pctx, ctx)
 	rule.Command().BuiltTool("check_boot_jars").
 		Input(ctx.Config().HostToolPath(ctx, "dexdump")).
 		Input(android.PathForSource(ctx, "build/soong/scripts/check_boot_jars/package_allowed_list.txt")).
-		Inputs(bootDexJarByModule.bootDexJarsWithoutCoverage()).
+		Inputs(bootDexJars).
 		Text("&& touch").Output(timestamp)
 	rule.Build("boot_jars_package_check", "check boot jar packages")