[GHC] #3252: having to call hs_add_root(__stginit_Foo) is a bit of a pain

[GHC]

#3252: having to call hs_add_root(__stginit_Foo) is a bit of a pain
---------------------------------+------------------------------------------
    Reporter:  duncan            |        Owner:              
        Type:  feature request   |       Status:  new         
    Priority:  normal            |    Milestone:  6.14.1      
   Component:  Compiler (FFI)    |      Version:  6.10.2      
    Keywords:                    |   Difficulty:  Unknown     
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
---------------------------------+------------------------------------------

Comment(by lodi):

 I recently ran into this issue when building a shared library with a
 c-interface.  A hand-built library (module  CInterface, no package) would
 link fine.  A cabal-built library (package test-0.0) would fail with:

 {{{
 ./libHStest-0.0-ghc6.12.1.so: undefined reference to
 `__stginit_CInterface'
 }}}

 After some help from duncan:

 {{{
 > nm libHStest-0.0-ghc6.12.1.so | grep stginit
 ...
 00004570 T __stginit_testzm0zi0_CInterface
 00004500 T __stginit_testzm0zi0_CInterface_dyn
 ...
 }}}

 So it turns out that the package name ''and version'' are embedded into
 the symbol.  This necessitates manually updating the c source files
 whenever the package version is incremented.  The error is additionally
 confusing since the manual states that ghc will automatically export
 {{{__stginit_Foo}}}, and also since it isn't even reported until the
 consuming application is linked.

 Some way to have ghc take care of this automatically would be much
 appreciated!

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3252#comment:4>
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