cvs diff -r queston

[Mark Lancisi]

Hello - 

I've got a branch that was branched some months ago from the trunk of one of my 
projects.

I'd like to diff the head of this branch with the HEAD of the trunk.

So - while in the top level directory of a local checked out copy of the branch 
I run:

cvs diff -rHEAD


Problem is, this seems to only return differences between the base files for 
the branch and the HEAD of the trunk, rather than the head of the branch and 
HEAD of the trunk. 
 (Example: So if I have file x.c that is currently  version 1.4 on the trunk 
and 1.2.2.7 on the branch, I'd expect the command I run run cvs -r1.4 -r1.2.2.7 
x.c against that file, but instead it runs cvs diff -r1.2 -r1.4 x.c)

One way around this, I've found,  is to use rdiff instead:

cvs rdiff -r<branchname> -rHEAD <projectname>

This does do the appropriate diffs, however I don't understand why simply 
running cvs diff -rHEAD doesn't do the same thing..

Thanks in advance for any help!