oskit-mach: -Wall

[Michael Teichgraeber]

Hi,

besides the `multi-line'-warnings caused by some oskit headers there
are still (in my oskit-mach copy) 271 warnings about implicit
declarations of functions
  http://www.stud.fernuni-hagen.de/q5631297/hurd/implicit

and 109 warnings with different messages
  http://www.stud.fernuni-hagen.de/q5631297/hurd/other_warnings .

The next file shows on a per-function basis, where functions are
implicitely used, where they are implemented and whether there already
is a header containing them:
  http://www.stud.fernuni-hagen.de/q5631297/hurd/ximplicit


Some functions within e.g. vm_map.c are marked as for `internal use
only', but nevertheless are used implicitely by some oskit/ds_*.c or
other vm/vm_* files, and there is no header defining them. How should
one handle these cases?

And, some variables (like X in device/net_io.c) `might be used
uninitialized'. They are mostly register `int's set to 0 in case of
`#if lint', but unset normally. This may have reasons concerning
speed. Can we be sure, that gcc sets them to zero or should they get
initialized?


Michael