[CMake] override variable in macro

[Dizzy]

On Thursday 20 September 2007 20:38:38 Juan Sanchez wrote:
> It appears that the set command cannot override a variable specified as
> a MACRO argument.
>
> For example:
>  MACRO (ADD_GADB RCMD)
>
> does not accept changes to RCMD within the macro using the set command.
>  Is there a way to override this?

As I understand it (from reading various cmake macros) is that 
MACRO "parameters" are not variables. They are "names of variables", they 
are "aliases" to variables if you wish. So when you call a macro with the 
parameter "someVAR" that in the macro is made to be received as "VARIABLE" 
then "VARIABLE" acts like a variable holding the NAME of the argument given 
variable (ie holding "someVAR") so then if you need to write/read someVAR you 
need to "dereference" VARIABLE (ie SET(${VARIABLE} "value") and not 
SET(VARIABLE "value")).

I haven't tried but the macro parameters might be immutable themselves (like 
C++ references :) ) so SET(VARIABLE something) might not be supported (but 
then again why would you ever need such a thing).

-- 
Mihai RUSU					Email: dizzy at roedu.net
			"Linux is obsolete" -- AST