[GHC] #9906: Warning generated by hscpp code have unhelpful file names

19 Dec 2014

      #9906: Warning generated by hscpp code have unhelpful file names
-------------------------------------+-------------------------------------
       Reporter:  tibbe              |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Driver             |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 I've started seeing this when compiling cabal with 7.8.3:

 {{{
 [64 of 80] Compiling Distribution.Simple.GHC ( Distribution/Simple/GHC.hs,
 dist/build/Distribution/Simple/GHC.o )

 /var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp:270:1:
 Warning:
     The import of ‘LibraryName’
     from module ‘Distribution.Simple.LocalBuildInfo’ is redundant

 /var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp:308:1:
 Warning:
     The import of ‘Language’
     from module ‘Language.Haskell.Extension’ is redundant

 /var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp:318:1:
 Warning:
     The import of ‘getTemporaryDirectory, getDirectoryContents’
     from module ‘System.Directory’ is redundant

 /var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp:325:1:
 Warning:
     The import of ‘System.IO’ is redundant
       except perhaps to import instances from ‘System.IO’
     To import instances alone, use: import System.IO()

 /var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp:1092:5:
 Warning:
     Pattern match(es) are non-exhaustive
     In an equation for ‘supportRPaths’: Patterns not matched: Ghcjs
 [65 of 80] Compiling Distribution.Simple.GHCJS (
 Distribution/Simple/GHCJS.hs, dist/build/Distribution/Simple/GHCJS.o )
 }}}

 The
 `/var/folders/00/0__yr000h01000cxqpysvccm0019bv/T/ghc43003_0/ghc43003_30.hscpp`
 file name isn't really helpful. I haven't seen this before so I'm guessing
 this is a regression.

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9906
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler