CVS build on mingw32 fails

[Marek Michalkiewicz <marekm at amelek dot gda dot pl>]

I've been told (by people making win32 GCC binaries for AVR target)
that CVS mainline fails to build on MinGW32 (builds fine on Cygwin).
The problem is that a few files:

 - gcc/collect2.c
 - gcc/fixinc/fixincl.c
 - gcc/fixinc/procopen.c
 - gcc/fixinc/server.c

(these programs are not really needed for AVR target, but might be
needed for other targets) use Unix-specific system calls like kill(),
pipe(), fork(), vfork(), alarm(), fcntl() which are missing on MinGW32.
The rest of GCC appears to build and work fine when configured for
build=i686-pc-mingw32, host=i686-pc-mingw32, target=avr .

I haven't verified this myself.  It's just what I can say looking at
a patch that works around the problem by using dummy #define for the
missing functions, as these programs don't have to work properly -
it is sufficient that they compile :)

The patch (not meant for inclusion in GCC, just to show the problem
so a real fix can be developed) is here:

  http://www.engr.uconn.edu/~tmahar/avrgcc/avrgcc-patches.htm

Thanks,
Marek