For my product I have several components into it. But all the components don’t change all the time. For a new release I create a tag from working trunk or branch (even though the component is changed or not) into SVN. And give the build on tags. Now I want to find out whether newly created tag has the code changes or not. Is there any SVN property or something useful available to easily find out that? Comparing the revision number of two tags is one solution but this is very difficult to find out which previous tag to use.
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If you components are subdirectories inside product dir and you tag always root of product you can diff two tags – new and previous
svn diff OLD-TAG-URL NEW-TAG-URLand fact of any output of diff will be sign of changes, diff content – actual aggregated changes