Re: [GHC] #13607: Panic when shared object file is missing: Dynamic linker not initialised (was: Panic with profiled compiler: Dynamic linker not initialised)

13 May 2017

      #13607: Panic when shared object file is missing: Dynamic linker not initialised
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Actually, you don't need a profiled compiler after all. You can reproduce
 this with an ordinary GHC with one extra step.

 As before, install some library, like `random-1.1`:

 {{{
 $ cabal install random-1.1 -w /opt/ghc/head/bin/ghc
 }}}

 Then figure out its package ID:

 {{{
 $ /opt/ghc/head/bin/ghc-pkg describe random
 name: random
 version: 1.1
 id: random-1.1-Gnn89iTXDuaz90MEyLmyr
 ...
 }}}

 This time, however, you'll need to change the contents of `.cabal` (where
 `cabal-install` puts its shared object files). On Linux, this can be
 accomplished like so:

 {{{
 $ cd ~/.cabal/lib/x86_64-linux-ghc-8.3.20170509/
 $ mv libHSrandom-1.1-Gnn89iTXDuaz90MEyLmyr-ghc8.3.20170509.so
 libHSrandom-1.1-Gnn89iTXDuaz90MEyLmyr-ghc8.3.20170509-dummy.so
 }}}

 Now compile `Bar.hs` as before:

 {{{
 $ /opt/ghc/head/bin/ghc -fforce-recomp Bar.hs -j2 -package-id
 random-1.1-Gnn89iTXDuaz90MEyLmyr
 [1 of 3] Compiling Foo              ( Foo.hs, Foo.o )

 <no location info>: error:
     ghc: panic! (the 'impossible' happened)
   (GHC version 8.3.20170509 for x86_64-unknown-linux):
         Dynamic linker not initialised

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 [2 of 3] Compiling Foo2             ( Foo2.hs, Foo2.o )

 <no location info>: error:
     <command line>: can't load .so/.DLL for:
 libHSrandom-1.1-Gnn89iTXDuaz90MEyLmyr.so
 (libHSrandom-1.1-Gnn89iTXDuaz90MEyLmyr.so: cannot open shared object file:
 No such file or directory)
 }}}

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13607#comment:1
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