[CMake] Recursively calling a macro: Is this possible in CMake?

[James Bigler]

This is a classic graph traversing problem. Each target is a node in  
the graph. What you need to do is make sure you only recurse on nodes  
you haven't visited yet. You can probably do this with a list of  
visited targets and  use the list(FIND_ITEM) (double check the command  
in the docs) to determine if you should recurse. Make sure to add the  
new node to the visited list before you recurse.

James

On Jan 16, 2009, at 7:57 PM, "Robert Dailey" <rcdailey at gmail.com> wrote:

>
> On Fri, Jan 16, 2009 at 6:23 PM, James Bigler  
> <jamesbigler at gmail.com> wrote:
> This code seems to produce the correct output with either a macro or  
> a function prototype.
>
> macro( foo )
>   list( APPEND my_list "+" )
>   list( LENGTH my_list length )
>   if( length LESS ${somevar} )
>     foo()
>   endif()
>   # Add this line in for functions
>   set( my_list ${my_list} PARENT_SCOPE )
> endmacro()
>
> set(somevar 100)
> set(my_list "")
> foo()
> message("my_list = ${my_list}")
>
>
> My guess is that the code isn't necessarily inlined, but interpreted  
> on the fly with special rules about variable scope.
>
> James
>
> Well my real code is slightly more complex. When I run it I get  
> infinite recursion of some sort and I have to forcefully close CMake  
> in order to stop it. Recursion in CMake isn't entirely intuitive so  
> if someone could breeze over this code and give me some pointers I'd  
> really appreciate that.
>
>
> macro( add_includes_impl target_name )
>     get_target_property( target_dependencies ${target_name}  
> LINK_INTERFACE_LIBRARIES )
>     foreach( dep ${target_dependencies} )
>         if( IS_TARGET ${dep} )
>             message( "${dep}" )
>             list( APPEND flattened_includes ${dep_includes} )
>             add_includes_impl( ${dep} )
>         endif()
>     endforeach()
> endmacro()
>
> macro( add_includes target_name )
>     set( flattened_includes )
>     add_includes_impl( target_name )
> endmacro()
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