eval and shell

[Doug Konrad]

I am having difficulty using eval and shell together. Here is my makefile:

     define aaa
     $(1)_VAR1 = World
     $(1)_VAR2 = $(shell echo Hello $($(1)_VAR1))
     endef

     $(eval $(call aaa,DEMO))

     $(info $(DEMO_VAR1))
     $(info $(DEMO_VAR2))

Output:
     ~$ make
     World
     Hello
     make: *** No targets.  Stop.

I would have thought the second line of output would have been:
     Hello World

Why isn't it, and how can I fix the makefile so it is?

Thanks
Doug