{-
      We split out the object files (.o, .dll) and add them
      to ldInputs for use by the linker.

      The following things should be considered compilation manager inputs:

       - haskell source files (strings ending in .hs, .lhs or other
         haskellish extension),

       - module names (not forgetting hierarchical module names),

       - things beginning with '-' are flags that were not recognised by
         the flag parser, and we want them to generate errors later in
         checkOptions, so we class them as source files (#5921)

       - and finally we consider everything not containing a '.' to be
         a comp manager input, as shorthand for a .hs or .lhs filename.

      Everything else is considered to be a linker object, and passed
      straight through to the linker.
    -}
looks_like_an_input :: String -> Bool
looks_like_an_input m =  isSourceFilename m
                      || looksLikeModuleName m
                      || "-" `isPrefixOf` m
                      || '.' `notElem` m
looks_like_an_input :: String -> Bool
looks_like_an_input m =  isSourceFilename m
                      || looksLikeModuleName m
                      || "-" `isPrefixOf` m
                      || '.' `notElem` m
looks_like_an_input m =  isSourceFilename m
                      || looksLikeModuleName m
                      || "-" `isPrefixOf` m
                      || '.' `notElem` m