Building documentation alone is broken

At the moment it seems that the only way to build documentation is to actually build all of GHC, which is nonsense. Methods of building documentation described in Building/Docs are broken:

To build just the Haddock docs for a given library, do this:
    cd libraries/base
    make html stage=0 FAST=YES

That ends with errors. See haddock_for_lib.log attachement.

To build a document on its own, for example the Users Guide, do this:

    cd docs/users_guide
    make html stage=0 FAST=YES

substitute 'html' for 'pdf' or 'ps' to build other types of documentation.

That also ends with errors. See users_guide.log attachement.

For above experiments I used the following lines in my mk/build.mk file:

HADDOCK_DOCS       = YES
BUILD_DOCBOOK_HTML = YES
BUILD_DOCBOOK_PS   = NO
BUILD_DOCBOOK_PDF  = NO

Then I run perl boot && ./configure. I didn't run make, just the above instructions. My configure returns this:

Configure completed successfully.

   Building GHC version  : 7.9.20141105

   Build platform        : x86_64-unknown-linux
   Host platform         : x86_64-unknown-linux
   Target platform       : x86_64-unknown-linux

   Bootstrapping using   : /home/killy/.ghc-sandbox/bin/ghc
      which is version   : 7.8.3

   Using gcc                 : /usr/bin/gcc
      which is version       : 4.5.1
   Building a cross compiler : NO
   cpp       : /usr/bin/gcc
   cpp-flags : -E -undef -traditional
   ld        : /usr/bin/ld
   Happy     : /home/killy/.cabal/bin/happy (1.19.4)
   Alex      : /home/killy/.cabal/bin/alex (3.1.3)
   Perl      : /usr/bin/perl
   dblatex   : /usr/bin/dblatex
   xsltproc  : /usr/bin/xsltproc

   Using LLVM tools
      llc   : /usr/bin/llc
      opt   : /usr/bin/opt
   HsColour : /home/killy/.cabal/bin/HsColour

   Building DocBook HTML documentation : NO
   Building DocBook PS documentation   : YES
   Building DocBook PDF documentation  : YES

I'm setting the milestone to 7.10.1. It's annoying to have this feature of the build system broken and it would be great to have this fixed.

Trac metadata

Trac field	Value
Version	7.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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