[CMake] macro within a custom command

[Brandon J. Van Every]

Brad King wrote:
>
> Try using FOREACH:
>
> FOREACH(root batch-driver ...)
>   ADD_CUSTOM_COMMAND(
>    OUTPUT ${Chicken_BINARY_DIR}/${root}.c
>    MAIN_DEPENDENCY ${root}.scm
>    DEPENDS parameters.scm
>    COMMAND ${VALID_CHICKEN} ${Chicken_SOURCE_DIR}/${root}.scm 
> -output-file ${Chicken_BINARY_DIR}/${root}.c ${CHICKEN_FLAGS}
>   )
> ENDFOREACH(root)

That would make all files in FOREACH depend on parameters.scm.  Not what 
I needed.  Previously I was listing out each ADD_CUSTOM_COMMAND 
separately because I had different DEPENDS and numbers of DEPENDS for 
each of them, and I wanted to get some abstraction in the COMMAND part 
only.  But I found a better solution per my other post.  Best trick is 
to create a global variable using file's rootname and a suffix like 
'_deplist', then use it to communicate additional data about the file.  
This kind of pseudo-OO persistent state technique can be applied to 
anything.

>
> > ADD_FILE_DEPENDENCIES is useless for that purpose.
>
> The ADD_FILE_DEPENDENCIES macro has a horrible name and was not well 
> documented or intentionally added to the release.  It is meant only 
> for the deprecated OBJECT_DEPENDS target property.  Please ignore its 
> existence.  I'm going to try to get it removed completely in 2.4.3 
> since it was not in the 2.2 release.

I've hurled and purged.  :-)


Cheers,
Brandon Van Every