[CMake] some comments on the LIST command

[Andy Cedilnik]

Hi Alex,

Alexander Neundorf wrote:

>yesterday I played a bit with the new LIST command in 2.4.1, and here are 
>some comments: 
> 
>-the REMOVE and REMOVE_ITEMS sub commands, while obvious, are not 
>documented in the help 
>  
>
Fixed.

> 
>-in the docs the list variable is sometimes called LIST and sometimes 
>called VAR 
>  
>
They should all be really a list variable. So, you cannot say:

LIST(LENGTH "foo;bar" var)

and expect to get 2.

>-why does an access beyond the end of the list fail with a cmake error ? 
>I would have expected to get an empty or FALSE or NOTFOUND value. This 
>would make using it easier 
>  
>
Should it fail gracefully? What should be the indicator?

>-the LIST command does not work on ARGN. Is this intentional ? 
>  
>
ARGN is special for now because of the way macros are handled. To use it 
do this:

SET(myarray ${ARGN})
LIST(.... myarray ...)

> -why is LIST( SET ...) not called LIST(APPEND ... ) ? 
>  
>
I added APPEND. I may take LIST(SET out.

> -is LIST(SET mySrcs foo.cpp) faster than SET(mySrcs ${mySrcs} foo.cpp) ? 
>  
>
List SET/APPEND appends, while SET justs sets to the value.

> But beside the nitpicking, a nice addition to cmake :-) 
> 
>

-- 
Andy Cedilnik
Kitware Inc.