[GHC] #14291: Tests tend to fail in the ext-interp way when split sections is enabled

[GHC]

#14291: Tests tend to fail in the ext-interp way when split sections is enabled
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:  13716
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I think the issue may not be in the RTS linker; rather, I suspect the
 issue is that the system linker is rearranging our sections. In
 `Data/Data.o` I see
 {{{
 $ readelf -W -s /mnt/work/ghc/ghc-compare-2/libraries/base/dist-
 install/build/Data/Data.o | grep DataAnyzuzdcgunfold
  14326: 0000000000000000     0 OBJECT  GLOBAL DEFAULT 5790
 base_DataziData_zdfDataAnyzuzdcgunfold_closure
  14327: 0000000000000020    68 OBJECT  GLOBAL DEFAULT 5794
 base_DataziData_zdfDataAnyzuzdcgunfold_info
 }}}
 With the sections 5790 and 5794 being
 {{{
   [5790] .data.base_DataziData_zdfDataAnyzuzdcgunfold_closure PROGBITS
 0000000000000000 033940 000010 00  WA  0   0  8
   [5794] .text.base_DataziData_zdfDataAnyzuzdcgunfold_info PROGBITS
 0000000000000000 033990 000064 00  AX  0   0  8
 }}}
 Whereas in the merged object file I see,
 {{{
 $ readelf -W -s /mnt/work/ghc/ghc-compare-2/libraries/base/dist-
 install/build/HSbase-4.10.0.0.o | grep DataAnyzuzdcgunfold
  81410: 0000000000076338    68 OBJECT  GLOBAL DEFAULT    1
 base_DataziData_zdfDataAnyzuzdcgunfold_info
  81411: 000000000000e6d0     0 OBJECT  GLOBAL DEFAULT    2
 base_DataziData_zdfDataAnyzuzdcgunfold_closure
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14291#comment:13>
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