[GHC] #15758: hsc2hs broken due to incorrect argument passing to the hsc2hs executable

[GHC]

#15758: hsc2hs broken due to incorrect argument passing to the hsc2hs executable
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           Reporter:  osa1           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently packages with .hsc files can't be built with GHC HEAD on some
 systems
 becuase of a problem in hsc2hs wrapper script. I don't understand the
 problem
 good enough, but we did some debugging with hvr today and he asked me to
 file a
 ticket. Here's how to reproduce:

 {{{
 regex-posix-0.95.2 $ cabal new-build --with-
 ghc=/home/omer/haskell/ghc/inplace/bin/ghc-stage2
 Warning: Unknown/unsupported 'ghc' version detected (Cabal 2.4.0.1
 supports
 'ghc' version < 8.7): /home/omer/haskell/ghc/inplace/bin/ghc-stage2 is
 version
 8.7.20181017
 Warning: The package list for 'hackage.haskell.org' is 22 days old.
 Run 'cabal update' to get the latest list of available packages.
 Resolving dependencies...
 Build profile: -w ghc-8.7.20181017 -O1
 In order, the following will be built (use -v for more details):
  - regex-posix-0.95.2 (lib:regex-posix) (first run)
 Warning: regex-posix.cabal:6:1: The field "build-type" is specified more
 than
 once at positions 6:1, 19:1
 Configuring regex-posix-0.95.2...
 Preprocessing library for regex-posix-0.95.2..
 hsc2hs: @/home/omer/haskell/regex-posix-0.95.2/dist-
 newstyle/build/x86_64-linux/ghc-8.7.20181017/regex-
 posix-0.95.2/build/Text/Regex/Posix/hsc2hs-response17101-2.txt:
 openBinaryFile: does not exist (No such file or directory)
 }}}

 As far as I understand, the problem is that the script runs `hsc2hs --
 @foo` instead of `hsc2hs @foo`. Hopefully hvr will correct if I
 misunderstood.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15758>
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