Build fails to pass locations of external tools to libraries

[bos]

I am trying to build GHC 6.8.3, and the default version of Haddock on my system is 2.0.0.0. I have Haddock 0.9 installed as /usr/bin/haddock-0.9, but libraries/Makefile does not pass this information down to the libraries it is building. I am already running the top-level configure script with the HaddockCmd environment variable set appropriately (and verified in the output from configure and inspection of mk/config.mk), so it's a simple matter of passing the information along.

I have attached a patch that passes the build's configured versions of Alex, Haddock, and Happy down to Cabal for each library. This fixes the problem for me, and I think it ought to apply to HEAD as well as to the 6.8 branch.

[igloo]

Agreed; thanks for the report

[igloo]

Thanks, I've fixed this. We now pass the flags, provided the values were not empty.