Cabal on multiple platforms

The current directory structure under 'dist/build' does not allow for sharing source code on multiple machines. I thought it would be a good idea to insert a directory layer for the target machine. Then I can use the same sources and haddock files on multiple machines which mount the same filesystem. Cabal could create, say dist build Linux-ix86 Linux-PPC Solaris-ix86 Solaris-MIPS doc html .