[GHC] #15908: Hadrian: Spurious build failure on fresh build

[GHC]

#15908: Hadrian: Spurious build failure on fresh build
-------------------------------------+-------------------------------------
           Reporter:  heisenbug      |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Build System   |           Version:  8.7
  (Hadrian)                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 On a freshly checked-out (Windows10 64)ghc tree I was building with
 hadrian (`hadrian/build.bat -j`). It aborted here:

 | Run Ghc CompileHs Stage1:
 libraries/pretty/src/Text/PrettyPrint/Annotated.hs =>
 _build/stage1/libraries/pretty/build/Text/PrettyPrint/Annotated.o
 | Run Ar Pack Stage1:
 _build/stage1/libraries/stm/build/Control/Concurrent/STM.p_o (and 9 more)
 => _build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a
 C:/Users/ggreif/ghc/inplace/mingw/bin/ar.exe: creating
 _build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a
 C:/Users/ggreif/ghc/inplace/mingw/bin/ar.exe: unable to rename
 '_build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a'; reason: File
 exists
 shakeArgsWith     0.001s    0%
 Function shake    0.317s    0%
 Database read     0.468s    0%
 With database     0.013s    0%
 Running rules  3492.921s   99%  =========================
 Total          3493.720s  100%
 Error when running Shake build system:
 * _build/stage1/lib/package.conf.d/stm-2.5.0.0.conf
 * _build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a
 user error (Development.Shake.cmd, system command failed
 Command: C:/Users/ggreif/ghc/inplace/mingw/bin/ar.exe q
 _build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a
 @C:\Users\ggreif\AppData\Local\Temp\extA08E
 Exit code: 1
 Stderr:
 C:/Users/ggreif/ghc/inplace/mingw/bin/ar.exe: creating
 _build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a
 C:/Users/ggreif/ghc/inplace/mingw/bin/ar.exe: unable to rename
 '_build/stage1/libraries/stm/build/libHSstm-2.5.0.0_p.a'; reason: File
 exists
 )

 Can this be a concurrency problem, while renaming archives?

 Anyway it healed after restarting Hadrian.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15908>
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