[Cmake] cmSourceFilesCommand : SOURCE_FILES NAME file AS target

[Ken Martin]

Bill and I discussed this and we think the specific problem can be
solved by creating a new file in VTK

vtkTkRenderWidgetPython.cxx

that conatins the code

#define VTK_PYTHON_BUILD  (or whatever it is)
#include "vtkTkRenderWidget.cxx"

Because it has a different name it will get compiled into a different
object file avoiding the file overwrite issue.

Ken


> I'd like to enhance the SOURCE_FILES syntax from :
>        SOURCE_FILES(NAME file1 file2 ...)
> to :
>        SOURCE_FILES(NAME file1 [AS target1] file2 [AS target2] ...)
>
> Meaning : the source file file1 would be compiled to a
> target file named
> target1 (optionally).
>
> Here is the reason. I'd like to achieve this :