[GHC] #14210: bkp files cannot find TemplateHaskell symbols (even without Backpack features)

[GHC]

#14210: bkp files cannot find TemplateHaskell symbols (even without Backpack
features)
-------------------------------------+-------------------------------------
           Reporter:  ezyang         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.2.1
  (Linking)                          |
           Keywords:  backpack       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{
 {-# LANGUAGE TemplateHaskell #-}
 unit th where
     module TH where
         f = [d| x = True |]
 unit p where
     dependency th
     module B where
         import TH
         $(f)
 }}}

 When run, this gives:

 {{{
 ghc: ^^ Could not load 'th_TH_f_closure', dependency unresolved. See top
 entry above.


 ByteCodeLink.lookupCE
 During interactive linking, GHCi couldn't find the following symbol:
   th_TH_f_closure
 This may be due to you not asking GHCi to load extra object files,
 archives or DLLs needed by your current session.  Restart GHCi, specifying
 the missing library using the -L/path/to/object/dir and -lmissinglibname
 flags, or simply by naming the relevant files on the GHCi command line.
 Alternatively, this link failure might indicate a bug in GHCi.
 If you suspect the latter, please send a bug report to:
   glasgow-haskell-bugs at haskell.org
 }}}

 I am not sure how easy or hard the fix is. We should bump this priority up
 if we get more serious about supporting Template Haskell with Backpack.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14210>
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