[GHC] #16187: Hadrian: Build fails when using absolute path for build root

[GHC]

#16187: Hadrian: Build fails when using absolute path for build root
-------------------------------------+-------------------------------------
           Reporter:  davide         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.6.3
  (Hadrian)                          |
           Keywords:  hadrian build  |  Operating System:  Linux
  root relative absolute path        |
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 This fails:

 {{{
 $ git clean -xdf
 $ ./boot && ./configure && ./hadrian/build.sh -o/tmp/build
 ...
 Error when running Shake build system:
   at src/Main.hs:58:30-42:
 * Depends on: test
   at src/Hadrian/Builder.hs:70:5-23:
 * Depends on: /tmp/build01/stage2/lib/platformConstants
   at src/Hadrian/Utilities.hs:292:5-18:
 * Depends on: /tmp/build01/generated/platformConstants
   at src/Hadrian/Builder.hs:70:5-23:
 * Depends on: /tmp/build01/stage0/bin/deriveConstants
   at src/Development/Shake/Internal/Rules/Oracle.hs:157:43-68:
 * Depends on: OracleQ (ContextDataKey (Context {stage = Stage0, package =
 Package {pkgType = Program, pkgName = "deriveConstants", pkgPath =
 "utils/deriveConstants"}, way = v}))
   at src/Hadrian/Haskell/Cabal/Parse.hs:214:5-36:
 * Depends on: /tmp/build01/stage0/utils/deriveConstants/setup-config
 * Raised the exception:
 Error, rule finished running but did not produce file:
   /tmp/build01/stage0/utils/deriveConstants/setup-config
 CallStack (from HasCallStack):
   error, called at src/Development/Shake/Internal/Rules/File.hs:180:58 in
 shake-0.17.4-5aa097213b9663d13b00fb582ca77bb18e6d60c3b0376f0fc60fdbf22a73c6f4:Development.Shake.Internal.Rules.File
 }}}

 but changing `/tmp/build` to the relative path succeeds (something like
 `-o../../../../tmp/build`).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16187>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler