[CMake] a backwards compatible language simplification

[Filipe Sousa]

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Ken Martin wrote:
> I incorporated some changes from Lloyd's patch and committed it to CVS.
> Basically if a project sets CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS on then you
> can leave off the arguments for the endif endwhile, else and endforeach
> commands. For example:

What about ENDMACRO?

> if (FOO AND BAR)
> else ()
> endif ()
> 
> The parenthesis are still required. I'm not sure what everyone's thoughts
> are on this but there it is...
> 
> Ken

- --
Filipe Sousa
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