Special case the stubgen args for bionic libs

IsNdk and NotInPlatform can return incorrect values in minimal branches
that do not contain the source bionic libraries. (e.g. in
aosp-master-art)

Bug: 275273834
Test: presbumits (which will build aosp-master-art)
Change-Id: I5e9216a40c0fd2d077bb6c53ba6628e311d99737

cc/library.go

@@ -676,6 +676,15 @@ func (library *libraryDecorator) compileModuleLibApiStubs(ctx ModuleContext, fla
 		!strings.Contains(ctx.ModuleName(), "libclang_rt") {
 		flag = flag + " --no-ndk"
 	}
+	// TODO(b/361303067): Remove this special case if bionic/ projects are added to ART development branches.
+	if isBionic(ctx.baseModuleName()) {
+		// set the flags explicitly for bionic libs.
+		// this is necessary for development in minimal branches which does not contain bionic/*.
+		// In such minimal branches, e.g. on the prebuilt libc stubs
+		// 1. IsNdk will return false (since the ndk_library definition for libc does not exist)
+		// 2. NotInPlatform will return true (since the source com.android.runtime does not exist)
+		flag = "--apex"
+	}
 	nativeAbiResult := parseNativeAbiDefinition(ctx, symbolFile,
 		android.ApiLevelOrPanic(ctx, library.MutatedProperties.StubsVersion), flag)
 	objs := compileStubLibrary(ctx, flags, nativeAbiResult.stubSrc)