diff -r without symlinks

Kurt Bischoff <[email protected]>
Newsgroups gmane.comp.gnu.utils
Message-ID <[email protected]>
I want to diff two large directory trees that are supposed to be the
same after creating one of them using cp -a <dir1> <dir2>

How can I use diff -r <dir1> <dir2> in a way that diff doesn't follow
symbolic links?
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