[CMake] foreach() bug?

[Brad King]

Alexandre.Feblot at thomsonreuters.com wrote:
> foreach(arg ${list})
[snip]
> The empty element has been discarded by foreach(). Is this the wanted 
> behaviour? If it is, how can I manage empty elements when I need them?

The foreach command never even sees the empty arguments.  By the time
${list} is evaluated the empty elements are gone.  This is for language
consistency.  No one would want

   add_executable(myexe ${srcs})

to try to add "" as a source file if srcs has an empty element.

In CMake HEAD from CVS there is an "IN" mode for foreach that supports
explicitly named lists:

   set(my_list "a;b;;c;d")
   foreach(arg IN LISTS my_list)
     ...
   endforeach()

For now you need to use the list() command.  You can iterate over
a range of the list size with foreach(arg RANGE ...).

-Brad