unknown epilogue mangling, WARNING: Epilogue junk

[igloo]

At some point (before the 10th Apr) we started getting epilogue junk in the HEAD, e.g.:

../compiler/ghc-inplace -Werror -H64m -Onot -fasm -optc-O2 -I../includes -I. -Iparallel -Ism -DCOMPILING_RTS -package-name rts -fvia-C -static  -I../gmp/gmpbuild -I../libffi/build/include -I. -dcmm-lint     -c Apply.cmm -o Apply.o
ghc-asm: unknown epilogue mangling? x86_64-unknown-linux
WARNING: Epilogue junk?:
    addq    $8, %rsp
    ret
    .size   stg_PAP_entry, .-stg_PAP_entry
    .p2align 4,,15
.globl stg_PAP_apply
    .type   stg_PAP_apply, @function

[igloo]

This was fixed by

Mon May 12 12:06:43 BST 2008  Simon Marlow <simonmar@microsoft.com>
  * Fixes to via-C prototype generation (FIX BUILD on Windows)
    
  Previously we declared all external labels with type StgWord[],
  because the same label might be used at different types in the same
  file, e.g. if there are multiple foreign import declarations for the
  same function.  However, we have to declare called functions with the
  right type on Windows, because this is the only way to make the
  compiler add the appropriate '@n' suffix for stdcall functions.
  
  Related to this is the reason we were getting mangler complaints
  (epilogue mangling) when compiling the RTS with -fvia-C.  The function
  barf() doesn't return, but we had lost that information by declaring
  our own prototypes, and so gcc was generating extra code after the
  call to barf().
  
  For more details see
  http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/Backends/PprC