[GHC] #15396: -staticlib is broken on GHC 8.4.3 on Linux under certain conditions

[GHC]

#15396: -staticlib is broken on GHC 8.4.3 on Linux under certain conditions
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
  (Linking)                          |
           Keywords:                 |  Operating System:  Linux
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 When compiling this simple program:

 {{{#!hs
 main = pure ()
 }}}

 Using the `-staticlib` flag on GHC 8.4.3 on Linux, it panics if using a
 certain toolchain:

 {{{
 $ uname -a
 Linux gearloose 4.2.0-42-generic #49~14.04.1-Ubuntu SMP Wed Jun 29
 20:22:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
 $ /opt/ghc/8.4.3/bin/ghc -staticlib Bug.hs
 Linking Bug.a ...
 ghc: panic! (the 'impossible' happened)
   (GHC version 8.4.3 for x86_64-unknown-linux):
         Data.Binary.Get.runGet at position 27462987: Invalid archive
 header end marker
 CallStack (from HasCallStack):
   error, called at libraries/binary/src/Data/Binary/Get.hs:351:5 in
 binary-0.8.5.1:Data.Binary.Get
 }}}

 I say "certain toolchain" since I am able to reproduce this issue on
 Ubuntu 14.04, but not 18.04:

 {{{
 $ uname -a
 Linux Linux-T450 4.15.0-24-generic #26-Ubuntu SMP Wed Jun 13 08:44:47 UTC
 2018 x86_64 x86_64 x86_64 GNU/Linux
 $ ghc -staticlib Bug.hs
 [1 of 1] Compiling Main             ( Bug.hs, Bug.o )
 Linking Bug.a ...
 }}}

 This issue does not occur on GHC 8.2 and earlier:

 {{{
 $ /opt/ghc/8.2.2/bin/ghc -staticlib Bug.hs
 [1 of 1] Compiling Main             ( Bug.hs, Bug.o )
 Linking Bug.a ...
 Static archive creation only supported on Darwin/OS X/iOS
 }}}

 Commit b8f33bc6b738b0378976e42b79369f0e53b680c7 allowed the use of
 `-staticlib` on all platforms. angerman, do you know what might be
 happening here?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15396>
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