[GHC] #15038: Memory Corruption (strange closure type)

[GHC]

#15038: Memory Corruption (strange closure type)
-------------------------------------+-------------------------------------
        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.4.3
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9718             |  Differential Rev(s):  Phab:D4680
       Wiki Page:                    |
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Comment (by Sergei Trofimovich <slyfox@…>):

 In [changeset:"79bbb23fd3085c3dc52497175e9e74f73f7f6b68/ghc" 79bbb23/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="79bbb23fd3085c3dc52497175e9e74f73f7f6b68"
 rts: export new absentSumFieldError from base

 commit b2ff5dde399cd012218578945ada1d9ff68daa35 "Fix #15038"
 added new stable closure 'absentSumFieldError_closure' to
 base package. This closure is used in rts package.

 Unfortunately the symbol was not explicitly exported and build
 failed on windows as:

 ```
 "inplace/bin/ghc-stage1" -o ...hsc2hs.exe ...
 rts/dist/build/libHSrts.a(RtsStartup.o): In function `hs_init_ghc':

 rts/RtsStartup.c:272:0: error:
      undefined reference to
 `base_ControlziExceptionziBase_absentSumFieldError_closure'
     |
 272 |     getStablePtr((StgPtr)absentSumFieldError_closure);
     | ^

 ```

 This change adds 'absentSumFieldError_closure' to explicit export
 into libHSbase.def.

 Signed-off-by: Sergei Trofimovich <slyfox at gentoo.org>
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15038#comment:43>
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