Exporting multiple line variables to sub-make

[Guo Leaveye]

I was failed on defining a rule pattern variable and using it in sub-sub-make.

So I collect all the affect code pieces on gist:

  https://gist.github.com/leaveye/72effc55ba5ed246a7df

my output is:
> # pattern-of-arg-a-and-arg-b
> make[1]: Entering directory `.../testmake'
> # pattern-of--and-
> make[1]: Leaving directory `.../testmake'

which is supposed to be same pattern output.

I was tested on Ubuntu 14.04 with GNU Make 3.81

Thanks for any idea.

Levi G.
Haskell is a beautiful language.