[Insight-developers] ITK version numbers (was: Bump CMakeLists.txt version to 4.1.0)

[Bill Lorensen]

VTK's is different. VTK in vtkGenerateVTKConfig.cmake has the magic to
create a VTKConfig.cmake that uses the kwsys time stamp.

On Mon, Dec 19, 2011 at 1:27 PM, Brad King <brad.king at kitware.com> wrote:
> On 12/19/2011 1:13 PM, Bill Lorensen wrote at
> http://review.source.kitware.com/3545:
>>
>> VTK has a nice feature for versioning. If the minor version is odd,
>> the patch version is the kwsys generated date stamp.
>
>
> ITK and VTK both have something along those lines:
>
>  http://itk.org/gitweb?p=ITK.git;a=blob;f=Modules/Core/Common/include/itkVersion.h;hb=v4.0.0#l40
>  http://vtk.org/gitweb?p=VTK.git;a=blob;f=Common/vtkVersion.h;hb=v5.8.0#l31
>
> I don't remember actually using a date as the patch level in either project.
>
> CMake used to use the date as the patch level in development versions.
> However it now uses the date as the fourth component so we don't actually
> need an odd/even distinction.  The CMake version number is of the form:
>
>  major.minor.patch.<date|tweak>
>
> If the fourth component is less than 20000000 then it is a release and
> otherwise it is a development version as of the given date (CCYYMMDD).
> This has the advantage that if a feature is introduced on a given date
> then someone that needs it can depend on the development version as of
> that date as the minimum required version.  The next release will have
> a version number larger than that because the major.minor.patch part
> will be bigger.
>
> -Brad



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