[GHC] #10375: arm: ghci hits an illegal instruction

[GHC]

#10375: arm: ghci hits an illegal instruction
-------------------------------------+---------------------------------
        Reporter:  erikd             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.2
       Component:  GHCi              |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:  arm
 Type of failure:  GHCi crash        |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by erikd):

 With the `DYNAMIC_GHC_PROGRAMS = NO` version of `ghc-stage2` I can
 actually run it under GDB directly, instead of running it in one terminal
 and attaching GDB to it from another terminal. However, if I try to set a
 breakpoint suddenly GDB and `ghc-stage2`'s terminal manipulation start
 fighting each other again.

 The above problem means I'm back to attaching GDB to `ghc-stage2` from a
 separate terminal, but I can't do it with a `getChar` in the `.gchi` file
 because the statically linked `ghc-stage2` is crashing before it loads the
 `.ghci` file. Instead, I have hacked `ghc/Main.hs` as follows:

 {{{

  main :: IO ()
  main = do
 +   args <- getArgs
 +   if "--interactive" `elem` args
 +       then do
 +           putStr "Continue ... "
 +           hFlush stdout
 +           _ <- getChar
 +           putStrLn "done"
 +       else return ()
     initGCStatistics -- See Note [-Bsymbolic and hooks]
     hSetBuffering stdout LineBuffering
     hSetBuffering stderr LineBuffering
 }}}

 This does allow me to attach GDB, but then I'm stuck with the same problem
 as before, attaching GDB changes the state of the program to an extent
 where I can't catch the problem.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10375#comment:24>
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