[Insight-developers] incorporating commit info

[Brad King]

On 4/25/2012 3:15 PM, M Stauffer -V- wrote:
> Is CMakeVersionSource.cmake run from cmake or as a cmake script from
> makefiles (I'm assuming the latter is possible)?

It's run during CMake processing, not during the build.

> If the former, then am
> I right in thinking that if the user has changed branches since running
> cmake, then the commit version will be wrong?

It's probably possible but CMake almost always reruns so we haven't
noticed problems.  That may be different for ITK though.

> If such a cmake script
> could be run from a makefile then the current commit and index status
> would always be accurate.

The script should run at build time in a custom target that always runs
and on which other targets (that use the generated header) depend using
add_dependencies.  The generated header should be updated only when
changed (copy-if-different).

> What do you then do with the CMake_VERSION_SOURCE variable? I'm thinking
> I'd write what I'm looking to produce to a header file that's included
> itkVersion.h.

Yes, it goes into a configured header file.

-Brad