[cmake-developers] Config files and version components

[Stephen Kelly]

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?

Thanks,

Steve.