please check: are any of these warnings affecting your package? warnings during make (ghc head, windows)

[Claus Reinke]

(copying to libraries, because many of these warnings come from extralibs)

With the ghc release candidate coming up soon, it might be a good time to
look at warnings? In a ghc head build on windows, there are many of them,
even though ghc and the core libs have undergone a lot of cleaning.

Even if I ignore ghc warnings like 'defined, but not used' 'binding shadowed',
'non-exhaustive match' (!), 'defaulting to', 'orphan instance', 'no type signature',
etc., there are plenty of warnings left, some of which slightly worrying,
suggesting include/documentation/cabal/deprecation trouble.

Starting with only those matching '^Warning:', and listing only examples for
each kind of warning, there are things like

    Warning: 'include-dirs: ../libraries/base/cbits' is a relative path outside of
    Warning: 'include-dirs: ../libraries/base/include' is a relative path outside

    Warning: 'include-dirs: stage2plus' directory does not exist.

    Warning: This package indirectly depends on multiple versions of the same

    Warning: HUnit.cabal: A package using section syntax should require

    Warning: defaultUserHooks in Setup script is deprecated.

    Warning: The documentation for the following packages are not installed. No
    (this is mostly rts, but also a couple of base-3)

    Warning: in export list of "GHC.Base": module not found: "GHC.Bool"
    Warning: in export list of "Data.Generics.Basics": module not found: "Data.Typeable"

    Warning: base:Control.Monad: could not find link destinations for:
        Data.Traversable.Id GHC.Arr.Array Data.Traversable.StateL Data.Traversable.StateR
        Text.ParserCombinators.ReadP.P

(these are from a local build of ghc+extralibs on windows, yesterday,
but there are also buildbot logs from a successful build:
http://darcs.haskell.org/buildbot/head/builders/x86%20Windows%20head/builds/505 )

There are other warnings, too, eg:

    libtool: link: warning: undefined symbols not allowed in i386-unknown-mingw32 shared libraries
    ar cru .libs/libffi.a  src/debug.o src/prep_cif.o src/types.o src/raw_api.o src/java_raw_api.o 
src/closures.o src/x86/ffi.o src/x86/win32.o

    libtool: install: warning: remember to run `libtool --finish /usr/local/lib'
    (on windows???)

    warning: implicit declaration of function `reallocf'

    warning: assignment makes pointer from integer without a cast

Should I be worried?-)
Claus