cdbs doc linking behavior is different when building with -b vs. -B

Binary package hint: cdbs

cdbs in Ubuntu has an Ubuntu-specific patch that causes docs that are identical between packages to be symlinked together:

    - 1/rules/debhelper.mk.in:
      + Symlink /usr/share/doc/ files to identical versions in any depending
        package which is built by the source package (except copyright, to
        adhere to Debian Policy). This can be disabled by setting
        $CDBS_NO_DOC_SYMLINKING.

However, when the package being linked *to* is Architecture: all, and the package being linked *from* is Architecture: any, this gives different package contents on i386 vs. other architectures because the Architecture: all package will only be available for inspection when dpkg-buildpackage is called with -B.

E.g., libfontconfig1:

$ dpkg -c ~/ubuntu/pool/main/f/fontconfig/libfontconfig1_2.8.0-2ubuntu1_amd64.deb |grep AUTHOR
-rw-r--r-- root/root 62 2006-09-07 16:33 ./usr/share/doc/libfontconfig1/AUTHORS
$ dpkg -c ~/ubuntu/pool/main/f/fontconfig/libfontconfig1_2.8.0-2ubuntu1_i386.deb |grep AUTHOR
lrwxrwxrwx root/root 0 2010-01-20 15:38 ./usr/share/doc/libfontconfig1/AUTHORS -> ../fontconfig-config/AUTHORS
$

This difference in contents makes the resulting packages incompatible with multiarch, which requires that any files shared among the different architectures of a package be identical.

I believe the correct fix is to not symlink these files if the link source package is Arch: any and the link target package is Arch: all. However, I don't know how much this might increase package sizes on i386 as a result.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: cdbs 0.4.83ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic 2.6.35.10
Uname: Linux 2.6.35-25-generic x86_64
Architecture: amd64
Date: Mon Feb 21 18:56:19 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: cdbs