[Omake] Documentation example does not work

[Aleksey Nogin]

On 20.08.2007 15:15, Markus Mottl wrote:

> the old example posted on August 9 seems to work fine now, but the new
> one I posted today still seems to be broken:
> 
> ------------------
> section
>  A = 1
>  foo = $(export A)
>  export($(foo))
> 
> println($(A))
> ------------------

Markus,

The export _function_ is no longer allowed to "penetrate" section 
boundaries - only a real export can. It is only allowed to 
package/unpackage environments. What you can do to emulate the above 
example is the following:

------------------
declare A
env =
    A = 1
    export(A)

export($(env))

println($(A))
------------------

Note the "declare A" upfront - it is needed in order to "tie" the usage 
of A to its definition (otherwise the OMake compiler has no reason to 
believe it's the same variable). This is not very important in 0.9.8.5, 
but will become increasingly important in future releases.

BTW, the loss in the "indirect exports" functionality in 0.9.8.5 is 
offset by the ability to use export statements in arbitrary positions 
within a section. E.g.

A =
    B = 1
    export B
    value $(B)

println($A-$B) #prints 1-1

Similarly, you can now have functions that _both_ export and return a value.

Aleksey

-- 
Aleksey Nogin, Research Scientist
Advanced Technologies Department, Information & System Sciences Lab
HRL Laboratories, LLC, Malibu, CA