[GHC] #8696: linking fails with 'relocation R_X86_64_PC32 against undefined symbol'

[GHC]

#8696: linking fails with 'relocation R_X86_64_PC32 against undefined symbol'
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        Reporter:  Kata      |            Owner:
            Type:  bug       |           Status:  closed
        Priority:  high      |        Milestone:  7.8.1
       Component:  Compiler  |          Version:  7.8.1-rc2
      Resolution:  fixed     |         Keywords:
Operating System:  Linux     |     Architecture:  x86_64 (amd64)
 Type of failure:  Other     |       Difficulty:  Unknown
       Test Case:            |       Blocked By:
        Blocking:            |  Related Tickets:
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Comment (by Reid Barton <rwbarton@…>):

 In [changeset:"3e3aa9258b521d362d3a51cb48969df3eeab4981/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3e3aa9258b521d362d3a51cb48969df3eeab4981"
 Fix linker interaction between Template Haskell and HPC (#9762)

 Summary:
 I'm not really happy about perpetuating the hackish fix for #8696,
 but at least in the context of building with -fhpc, the performance
 cost should be negligible.

 I'm suspicious about PlainModuleInitLabel and the Windows stuff too,
 but I don't know what it does / can't test it (respectively) so I'll
 leave those alone for now.

 Hopefully out-of-process TH will save us from these hacks some day.

 The test is an adaptation of T8696. It's a bit more awkward since
 I couldn't think of a way to get cross-module tickbox references
 without optimizations (inlining), but ghci doesn't permit -O for
 some reason.

 Test Plan: harbormaster; validate

 Reviewers: austin

 Reviewed By: austin

 Subscribers: carter, thomie

 Differential Revision: https://phabricator.haskell.org/D583

 GHC Trac Issues: #9762

 Conflicts:
         testsuite/tests/ghci/scripts/all.T
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8696#comment:34>
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