[GHC] #15207: bad dwarf frame in stgRun.c when compiled with with gcc on mac and assembled by as/gcc/clang (aka apple clang assembler)

[GHC]

#15207: bad dwarf frame in stgRun.c when compiled with with gcc on mac and
assembled by as/gcc/clang (aka apple clang assembler)
-------------------------------------+-------------------------------------
        Reporter:  carter            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Runtime System    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D4780
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by carter):

 * differential:   => D4780


Comment:

 https://phabricator.haskell.org/D4780 for a candidate patch. Not perfect,
 and may have other issues, but fixes the mac build without impacting other
 platforms.

 I'm not 100% sure i'm fixing it perfectly, but it definitly has zero
 impact on non-darwin platforms, and my understanding is this particular
 dwarf data only works in the presence of the RTS support for stack walking
 which is exclusive to ELF platforms?

 Or is there a fundamental error in this fix?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15207#comment:13>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler