[CMake] Function variable name question

[James Bigler]

I have the following code in a script:

function(set_var var)
  message("var = ${var}")
  message("${var} = ${${var}}")
  set(${var} "new_val")
  message("${var} = ${${var}}\n")
endfunction()

set(myvar 10)
set_var(myvar)

# Empty variable
set_var(myvar2)

set_var(var)

# Set variable
set(var 11)
set_var(var)

When I run it I get the following output:

var = myvar
myvar = 10
myvar = new_val

var = myvar2
myvar2 =
myvar2 = new_val

var = var
var = var
new_val =

var = var
var = var
new_val =

I get expected output when the name of the variable I pass in isn't the same
as the one used in the function parameter list.

Is this the desired behavior of the language?  I would argue that it isn't,
because you get different behavior based on the name of the variable passed
in.

I'm using CMake 2.6.3R8 on WinXP 64.

Thanks,
James
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