[cmake-developers] Config files and version components

[Alexander Neundorf]

On Monday 21 January 2013, Stephen Kelly wrote:
> Alexander Neundorf wrote:
> > On Monday 21 January 2013, Stephen Kelly wrote:
> >> Hi,
> >> 
> >> Currently it is common to set somepackage_VERSION_{MAJOR,MINOR,PATCH} in
> >> a Config.cmake file.
> >> 
> >> The somepackage_VERSION_{MAJOR,MINOR,PATCH,TWEAK} variables are already
> >> set if parsable from the PACKAGE_VERSION if set. This is the case if
> >> using WRITE_BASIC_PACKAGE_VERSION_FILE().
> >> 
> >> The problem I see is that those variables are set to "0" if the version
> >> component is not set. This appears to be a side-effect of the way they
> >> are stored in the cmFindPackageCommand (eg, unsigned int VersionMinor).
> >> There is also the somepackage_VERSION_COUNT to say how many components
> >> are valid.
> >> 
> >> I consider it a bug that the variables are set to "0" if the version
> >> component is not set. Can we change that?
> > 
> > Not sure I remember correctly.
> > 
> > I think initially somewhere not all component-wise version variables had
> > been set. I think after some discussion we concluded that it makes sense
> > to set unset version components to 0.
> > I.e. 4.0 means IMO implicitely 4.0.0.0.
> > 
> > Where do you see a problem with this ?
> 
> Only that I think it's odd.
> 
> The Foo package name is 4.3.2, but if you check all the components, it
> looks like 4.3.2.0, which is not 'true'.

Is VERSION_COUNT then actually set to 3 or 4 ?

Alex