RFR: JDK-8144911: Consider having modifications to jdk.jlink trigger recreation of all jmods

[Tim Bell]

Erik:

> This small patch adds the jmod tool itself as a dependency to the 
> creation of jmods. The effect of this is that changes to the jmod tool 
> src will trigger a rebuild of all jmods automatically.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8144911
> Patch:
> diff -r 89769a2f1511 make/CreateJmods.gmk
> --- a/make/CreateJmods.gmk
> +++ b/make/CreateJmods.gmk
> @@ -82,6 +82,12 @@
>    endif
>  endif
>
> +# Changes to the jmod tool itself should also trigger a rebuild of 
> all jmods
> +DEPS += $(JMOD_CMD)
> +ifeq ($(EXTERNAL_BUILDJDK), false)
> +  DEPS += $(call CacheFind, 
> $(JDK_OUTPUTDIR)/modules/jdk.jlink/jdk/tools/jmod)
> +endif
> +
>  # TODO: What about headers?
>  # Create jmods in a temp dir and then move them into place to keep the
>  # module path in $(IMAGES_OUTPUTDIR)/jmods valid at all times.

Looks good.

/Tim