[GHC] #11340: linker_unload test fails on ARM

[GHC]

#11340: linker_unload test fails on ARM
-------------------------------------+----------------------------------
        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  arm
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1728
       Wiki Page:                    |
-------------------------------------+----------------------------------

Comment (by bgamari):

 Here is an excerpt from the Diff description,

 > The gist here is that previously we didn't catch the case where a
 relocation
 > resulted in a jump that would overflow the 24-bit target address of
 ARM's
 > branch instructions. This resulted in a segmentation fault. I've added
 an
 > explicit check so that we now provide a reasonable error message in this
 case.
 >
 > Moreover, we now set `USE_CONTIGUOUS_MMAP` on ARM, following the
 behavior of
 > PowerPC to avoid symbols being too far removed from their extras.
 >
 > While doing this, I took the opportunity to refactor relocation
 handling,
 > making it follow LLVM LLD's implementation more closely since the ARM
 ELF
 > specification is a bit unclear in some places and I believe the LLD
 > implementation is trustworthy.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11340#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler