Add cc_library.target.vendor.no_stubs

This is to handle libz special case. libz has stubs but not an LLNDK.
So, libz.vendor should be treated as non-stub-providing libraries and
Vendor APEX should bundle it if it's used by its contents.

libz will set no_stubs for vendor/product variants.

Bug: 313806237
Test: go tests ./apex/...
Change-Id: I10759d7073838909126f8bfe87654f11aa02fd32

cc/image.go

@@ -23,6 +23,8 @@ import (
 
 	"android/soong/android"
 	"android/soong/snapshot"
+
+	"github.com/google/blueprint/proptools"
 )
 
 var _ android.ImageInterface = (*Module)(nil)
@@ -622,6 +624,10 @@ func squashVendorSrcs(m *Module) {
 
 		lib.baseCompiler.Properties.Exclude_generated_sources = append(lib.baseCompiler.Properties.Exclude_generated_sources,
 			lib.baseCompiler.Properties.Target.Vendor.Exclude_generated_sources...)
+
+		if lib.Properties.Target.Vendor.No_stubs {
+			proptools.Clear(&lib.Properties.Stubs)
+		}
 	}
 }
 
@@ -635,6 +641,10 @@ func squashProductSrcs(m *Module) {
 
 		lib.baseCompiler.Properties.Exclude_generated_sources = append(lib.baseCompiler.Properties.Exclude_generated_sources,
 			lib.baseCompiler.Properties.Target.Product.Exclude_generated_sources...)
+
+		if lib.Properties.Target.Product.No_stubs {
+			proptools.Clear(&lib.Properties.Stubs)
+		}
 	}
 }
 

cc/library.go

@@ -107,6 +107,13 @@ type LibraryProperties struct {
 			Suffix *string `android:"arch_variant"`
 
 			Header_abi_checker headerAbiCheckerProperties
+
+			// Disable stubs for vendor/product variants
+			// This is a workaround to keep `stubs` only for "core" variant (not product/vendor).
+			// It would be nice if we could put `stubs` into a `target: { core: {} }`
+			// block but it's not supported in soong yet. This could be removed/simplified once we have
+			// a better syntax.
+			No_stubs bool
 		}
 
 		Platform struct {