There seems to be a bug at line 32 of file NativeBinaryRules.java [1]. The rule assume only one node will be of type File which maps to buildDir (the @Path is commented out). This is problematic when trying to follow the same pattern and have root element for reports directory and possibly more. The following code show the failure:

{{class Rules extends RuleSource {
@Model
File reportsDir(@Path("buildDir") File buildDir)

}
apply plugin: Rules
apply plugin: "cpp"

model {
toolChains

components

}}}
Executing $ ./gradlew.bat :tasks will cause the following exception:

> Exception thrown while executing model rule: NativeComponentModelPlugin.Rules#createBinaries(TargetedNativeComponentInterval, PlatformResolvers, BuildTypeContainer, FlavorContainer, ServiceRegistry) > named(executable, org.gradle.nativeplatform.internal.configure.NativeBinaryRules)
> There is a problem with model rule NativeBinaryRules#assignTools(NativeBinarySpec, NativeToolChainRegistryInternal, File).
> Type-only model reference of type java.io.File (parameter 3) is ambiguous as multiple model elements are available for this type:

• buildDir (created by: Project.<init>.buildDir())
• reportsDir (created by: Rules#reportsDir(File))
  The gradle version we are using is 2.14.1 on a Windows operating system. They may be other rules coded like this one which would require grepping the codebase in order to find them and apply a fix.

[1] https://github.com/gradle/gradle/blob/master/subprojects/platform-native/src/main/java/org/gradle/nativeplatform/internal/configure/NativeBinaryRules.java#L321