[CMake] "another target with the same name exists"

[Bill Hoffman]

kent williams wrote:
> Am I insane, or is CMake?
> 
> In a subdirectory of our big ol build tree, CMake is freaking out
> about duplicate targets in a way that makes no sense to me:
> 
> CMake Error at src/iplProg/AutoSeg/ProcessDescription/CMakeLists.txt:3
> (ADD_LIBRARY):
>   add_library cannot create target "ProcessDescription" because another
>   target with the same name already exists.  The existing target is a static
>   library created in source directory
>   "/scratch/kent/brains2/src/iplProg/AutoSeg/ProcessDescription".  See
>   documentation for policy CMP0002 for more details.
> 
> Here is the entirety of the 'offending' CMakeLists.txt:
> 
> FILE (GLOB ProcessDescription_SRC *.cxx)
> 
> ADD_LIBRARY(ProcessDescription ${ProcessDescription_SRC})
> 
> Grepping through all the CMakeLists.txt in our source tree, that is
> the only place that library is cited as a target.
> 
> Note that 'src/iplProg/AutoSeg/ProcessDescription' is the same
> directory as   "/scratch/kent/brains2/src/iplProg/AutoSeg/ProcessDescription"
> 
> I read the CMP0002 policy description, and I don't see how it applies
> in this particular case.  CMake is acting as though it's incorrectly
> detecting a target as having been defined twice in exactly the same
> place in the same CMakeLists.txt.
> _

Is it possible that the directory is being added twice?

add_subdirectory(AutoSeg)
...
add_subdirectory(AutoSeg)

Would cause that same error.

-Bill