[CMake] addprefix macro?

[Michael Wild]

On 5. May, 2010, at 16:14 , Marc Weber wrote:

> Hi, I'm new to cmake.
> 
> I asked at #cmake how to prefix a string to a list of paths.
> I got the reply that I should use a foreach loop which worked.
> 
> Can I abstract this pattern using a macro such as this?
> 
> 
>  # prefix and suffix each element of list by ${prefix}elemnt${suffix}
>  macro(PREFIXSUFFIX list_name prefix suffix)
>    # create empty list - necessary?
>    SET(${list_name}_TMP)
> 
>    # prefix and suffix elements
>    foreach(l ${list_name})
>      list(APPEND ${list_name}_TMP ${prefix}${l}${suffix} )
>    endforeach()
> 
>    # replace list by tmp list
>    SET(${list_name} ${list_name}_TMP)
>    UNSET(${list_name}_TMP)
>  endmacro(PREFIXSUFFIX)
> 
> 
> When running make I get something like:
> 
> make[2]: *** No rule to make target
> `/pr/tasks/terraView_trunk/build/cmake/UI_FILES_TMP', needed by
> `UI_FILES_TMP.h'.  Stop.
> 
> 
> So what's the missing piece I don't understand yet?
> 
> Sincerely
> Marc Weber

In your last SET your setting the variable to the temporary list name, not its contents. Use this instead:

SET(${list_name} "${${list_name}_TMP}")

Also, you might consider turning the whole thing into a function instead. This has the advantage of having a local scope. You pass the result back by using PARENT_SCOPE in the last SET command.

HTH

Michael