[Insight-developers] ITK_BUILD_ALL_MODULES and ITK_BUILD_DEFAULT_MODULES

[Padfield, Dirk R (GE Global Research)]

Hi Xiaoxiao,

Thanks for the explanation.  I imagine that many users will have existing trees and will be thrown off by the behavior listed below.  Would there be any negative consequences to changing

from
if(DEFINED ITK_BUILD_ALL_MODULES)
to
if(${ITK_BUILD_ALL_MODULES})

The latter seems more intuitive to me and also seems to behave better (according to the behavior I listed below).  It doesn't matter much to me either way, but I thought it might matter to users.

Thanks,
Dirk


________________________________
From: Xiaoxiao Liu [xiaoxiao.liu at kitware.com]
Sent: Friday, October 04, 2013 2:30 PM
To: Padfield, Dirk R (GE Global Research)
Cc: <insight-developers at itk.org> Developers
Subject: Re: [Insight-developers] ITK_BUILD_ALL_MODULES and ITK_BUILD_DEFAULT_MODULES

Dirk,
Thanks for reporting.
Please see my comments below.
Let me know whether this clarifies.
Thanks.

On Fri, Oct 4, 2013 at 1:25 PM, Padfield, Dirk R (GE Global Research) <padfield at research.ge.com<mailto:padfield at research.ge.com>> wrote:
Hi Developers,

I have a quick ITK CMake question.  In the file CMake/ITKModuleEnablement.cmake, we find the code

# To maintain backward compatibility
if(DEFINED ITK_BUILD_ALL_MODULES)
  message(WARNING "ITK_BUILD_ALL_MODULES is deprecated, please use ITK_BUILD_DEFAULT_MODULES.")
  set(ITK_BUILD_DEFAULT_MODULES ${ITK_BUILD_ALL_MODULES} CACHE BOOL "Build the default ITK modules." FORCE)
endif()

This has the following behavior:
1) If ITK_BUILD_ALL_MODULES is set, ITK_BUILD_DEFAULT_MODULES is also set.
2) When the user sees this warning, he/she may turn off ITK_BUILD_MODULES.
>>> If you start from an existing build tree (which has the old cache entry of "ITK_BUILD_ALL_Modules"), yes, you would
see this warning. To remove this warning (without cleaninig the entire CMake Cache),  instead of turning OFF "ITK_BUILD_ALL_Modules",  you could just remove it from the CMake cache (on CMake GUI, select the variable and hit "Delete").

3) This also turns off the ITK_BUILD_DEFAULT_MODULES
4) Since ITK_BUILD_ALL_MODULES is still DEFINED, the warning continues.
5) If the user explicitly turns ITK_BUILD_DEFAULT_MODULES back on, it gets turned off again on the next compile
6) The only way to get the expected behavior is to keep both of them on, but then the warning continues.

I believe the intention was instead to use
if(${ITK_BUILD_ALL_MODULES})

In this case
1) If ITK_BUILD_ALL_MODULES is set, it gives a warning and then sets ITK_BUILD_DEFAULT_MODULES
2) The warning is only given when ITK_BUILD_ALL_MODULES is turned on
3) If ITK_BUILD_ALL_MODULES is turned off, it has no effect on ITK_BUILD_DEFAULT_MODULES
4) ITK_BUILD_DEFAULT_MODULES can be set when ITK_BUILD_ALL_MODULES is turned off

Thoughts?

Thanks,
Dirk
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---------------------------------------------
Xiaoxiao Liu, Ph.D.
R & D Engineer
Kitware Inc<http://www.kitware.com/>.
Clifton Park, NY
Phone: (518) 881-4924  or  (518) 371-3971 x124