[GHC] #11683: compiled files don't load in ghci

[GHC]

#11683: compiled files don't load in ghci
-------------------------------------+-------------------------------------
        Reporter:  George            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc2
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by George:

@@ -48,1 +48,1 @@
- Unfortunately when I do
+ Unfortunately when I add -v I don't see why it works.
@@ -53,2 +53,2 @@
- I don't see why it works. It doesn't seem to use just ghc to compile , it
- also uses gcc, see attached file.
+ It doesn't seem to use just ghc to compile , it also uses gcc, see
+ attached file.

New description:

 compiled files don't load in ghci

 {{{
 ghc -DYNAMIC bug.hs
 [1 of 1] Compiling Main             ( bug.hs, bug.o )
 Linking bug ...
 bash-3.2$ ghci -ignore-dot-ghci

 GHCi, version 8.0.0.20160204: http://www.haskell.org/ghc/  :? for help
 Prelude> Prelude> :load bug
 [1 of 1] Compiling Main             ( bug.hs, interpreted )
 Ok, modules loaded: Main.
 *Main> :show modules
 Main             ( bug.hs, interpreted )
 *Main>
 }}}

 According to the doc,
 file:///usr/local/share/doc/ghc-8.0.0.20160204/html/users_guide/ghci.html
 #loading-compiled-code,  this should work:

 {{{
 Note the -dynamic flag to GHC: GHCi uses dynamically-linked object code
 (if you are on a platform that supports it), and so in order to use
 compiled code with GHCi it must be compiled for dynamic linking.
 }}}

 Similarly https://ghc.haskell.org/trac/ghc/ticket/8736#comment:4 says the
 same thing:

 {{{
 if you say :load Foo in GHCi

 Foo was compiled with -dynamic: loads Foo.o
 }}}

 Interestingly -fobject-code does work:

 {{{
  ghci -ignore-dot-ghci -fobject-code
 GHCi, version 8.0.0.20160204: http://www.haskell.org/ghc/  :? for help
 Prelude> :load bug
 [1 of 1] Compiling Main             ( bug.hs, bug.o )
 Ok, modules loaded: Main.
 Prelude Main>
 }}}

 Unfortunately when I add -v I don't see why it works.
 {{{
 ghci -v -ignore-dot-ghci -fobject-code
 }}}

 It doesn't seem to use just ghc to compile , it also uses gcc, see
 attached file.
 {{{
  ghc --version
 The Glorious Glasgow Haskell Compilation System, version 8.0.0.20160204
 bash-3.2$ ghc --info
  [("Project name","The Glorious Glasgow Haskell Compilation System")
  ,("GCC extra via C opts"," -fwrapv -fno-builtin")
  ,("C compiler command","/usr/bin/gcc")
  ,("C compiler flags"," -m64 -fno-stack-protector")
  ,("C compiler link flags"," -m64")
  ,("Haskell CPP command","/usr/bin/gcc")
  ,("Haskell CPP flags","-E -undef -traditional -Wno-invalid-pp-token -Wno-
 unicode -Wno-trigraphs")
  ,("ld command","/usr/bin/ld")
  ,("ld flags"," -arch x86_64")
  ,("ld supports compact unwind","YES")
  ,("ld supports build-id","NO")
  ,("ld supports filelist","YES")
  ,("ld is GNU ld","NO")
  ,("ar command","/usr/bin/ar")
  ,("ar flags","clqs")
  ,("ar supports at file","NO")
  ,("touch command","touch")
  ,("dllwrap command","/bin/false")
  ,("windres command","/bin/false")
  ,("libtool command","libtool")
  ,("perl command","/usr/bin/perl")
  ,("cross compiling","NO")
  ,("target os","OSDarwin")
  ,("target arch","ArchX86_64")
  ,("target word size","8")
  ,("target has GNU nonexec stack","False")
  ,("target has .ident directive","True")
  ,("target has subsections via symbols","True")
  ,("Unregisterised","NO")
  ,("LLVM llc command","/usr/local/bin/llc-3.7")
  ,("LLVM opt command","/usr/local/bin/opt-3.7")
  ,("Project version","8.0.0.20160204")
  ,("Project Git commit id","e2230228906a1c0fa1f86a0c1aa18d87de3cc49d")
  ,("Booter version","7.10.2")
  ,("Stage","2")
  ,("Build platform","x86_64-apple-darwin")
  ,("Host platform","x86_64-apple-darwin")
  ,("Target platform","x86_64-apple-darwin")
  ,("Have interpreter","YES")
  ,("Object splitting supported","YES")
  ,("Have native code generator","YES")
  ,("Support SMP","YES")
  ,("Tables next to code","YES")
  ,("RTS ways","l debug thr thr_debug thr_l thr_p dyn debug_dyn thr_dyn
 thr_debug_dyn l_dyn thr_l_dyn")
  ,("RTS expects libdw","NO")
  ,("Support dynamic-too","YES")
  ,("Support parallel --make","YES")
  ,("Support reexported-modules","YES")
  ,("Support thinning and renaming package flags","YES")
  ,("Requires unified installed package IDs","YES")
  ,("Uses package keys","YES")
  ,("Uses unit IDs","YES")
  ,("Dynamic by default","NO")
  ,("GHC Dynamic","YES")
  ,("GHC Profiled","NO")
  ,("Leading underscore","YES")
  ,("Debug on","False")
  ,("LibDir","/usr/local/lib/ghc-8.0.0.20160204")
  ,("Global Package DB","/usr/local/lib/ghc-8.0.0.20160204/package.conf.d")
  ]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11683#comment:3>
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The Glasgow Haskell Compiler