[CMake] override variable in macro

[Juan Sanchez]

What I was trying to do was to avoid having to create a local variable.
 The macro parameter is the default, which can be overridden if necessary.

Now I immediately have to set a new variable with the value of the
parameter.  So I now have to account for another variable being created
which may then escape the macro's namespace.

Can we have the SET command fail on trying to set a macro parameter?

Juan

Dizzy wrote:
> 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).
> 


-- 
Juan Sanchez
Juan.Sanchez at amd.com
800-538-8450 Ext. 54395
512-602-4395