[GHC] #16069: Proposal to resolve some confusion about stages in Hadrian

[GHC]

#16069: Proposal to resolve some confusion about stages in Hadrian
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Matthew Pickering <matthewtpickering@…>):

 In [changeset:"6486c6e49c53e75f37ed732b38c5be7ae64785e8/ghc"
 6486c6e4/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6486c6e49c53e75f37ed732b38c5be7ae64785e8"
 Hadrian: Add support for building stage3

 This ticket enables the building of a `stage3` compiler by making the
 build logic more consistent and predictable in Hadrian.

 Two of the main changes are:

 1. In order to build anything at stageN we use the package database
 present at stageN. Fixing #16069
 2. `haddock` and `ghc-tags` are built
 as stage1 executables (with the stage1 compiler) rather than as
 stage2 compiler. Fixing
 [hadrian#661](https://github.com/snowleopard/hadrian/issues/661)

 In order to build a stage3 compiler, you have to set the new `finalStage`
 hadrian option to `Stage3`.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16069#comment:5>
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