Additional buidl system cleanup. Starting to move all

of the kernel specific build info in to config/kernel,
likewise and user specific build flags should go in
config/user.  This seems like a reasonable way to go.

config/kernel

@@ -1 +1,51 @@
 # Default ZFS kernel mode configuration 
+
+# Kernel build make options
+KERNELMAKE_PARAMS=
+#KERNELMAKE_PARAMS="V=1"	# Enable verbose module build
+
+# Kernel build cpp flags
+KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL "
+KERNELCPPFLAGS="$KERNELCPPFLAGS -I$splsrc -I$splsrc/include -I$TOPDIR"
+
+# Minimally required for pread() functionality an other GNU goodness
+HOSTCFLAGS="$HOSTCFLAGS -ggdb -O2 -std=c99 -D_GNU_SOURCE -D__EXTENSIONS__ "
+
+# XXX: Quiet warnings not covered by the gcc-* patches
+# XXX: Once all the warnings are resolved these flags should be removed
+HOSTCFLAGS="$HOSTCFLAGS -Wno-switch -Wno-unused -Wno-missing-braces -Wno-parentheses "
+HOSTCFLAGS="$HOSTCFLAGS -Wno-uninitialized -fno-strict-aliasing "
+
+# Expected defines not covered by zfs_config.h or spl_config.h
+HOSTCFLAGS="$HOSTCFLAGS -DHAVE_SPL -D_POSIX_PTHREAD_SEMANTICS "
+HOSTCFLAGS="$HOSTCFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_REENTRANT "
+HOSTCFLAGS="$HOSTCFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\" "
+
+# Expected default include paths additional paths added by Makefiles
+HOSTCFLAGS="$HOSTCFLAGS -I$TOPDIR "
+
+if test "$kernelbuild" != "$kernelsrc"; then
+	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$kernelbuild"
+fi
+
+# XXX: I really, really hate this...  but to ensure the kernel build 
+# system compiles C files shared between a library and a kernel module, 
+# we need to ensure each file has a unique make target.  To do that 
+# I'm creating symlinks for each shared file at configure time.  It 
+# may be possible something better can be done in the Makefile but it
+# will take some serious investigation and I don't have the time now.
+
+echo "Creating symlinks for additional make targets"
+ln -f -s $LIBDIR/libport/u8_textprep.c      $LIBDIR/libport/ku8_textprep.c
+ln -f -s $LIBDIR/libavl/avl.c               $LIBDIR/libavl/kavl.c
+ln -f -s $LIBDIR/libavl/avl.c               $LIBDIR/libavl/uavl.c
+ln -f -s $LIBDIR/libnvpair/nvpair.c         $LIBDIR/libnvpair/knvpair.c
+ln -f -s $LIBDIR/libnvpair/nvpair.c         $LIBDIR/libnvpair/unvpair.c
+ln -f -s $LIBDIR/libzcommon/zfs_deleg.c     $LIBDIR/libzcommon/kzfs_deleg.c
+ln -f -s $LIBDIR/libzcommon/zfs_prop.c      $LIBDIR/libzcommon/kzfs_prop.c
+ln -f -s $LIBDIR/libzcommon/zprop_common.c  $LIBDIR/libzcommon/kzprop_common.c
+ln -f -s $LIBDIR/libzcommon/compress.c      $LIBDIR/libzcommon/kcompress.c
+ln -f -s $LIBDIR/libzcommon/list.c          $LIBDIR/libzcommon/klist.c
+ln -f -s $LIBDIR/libzcommon/zfs_namecheck.c $LIBDIR/libzcommon/kzfs_namecheck.c
+ln -f -s $LIBDIR/libzcommon/zfs_comutil.c   $LIBDIR/libzcommon/kzfs_comutil.c
+ln -f -s $LIBDIR/libzcommon/zpool_prop.c    $LIBDIR/libzcommon/kzpool_prop.c

config/zfs-build.m4

@@ -13,9 +13,6 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 	        *** in ./config/ with the '--with-zfs-config=CONFIG' option])
 	fi
 
-	AC_MSG_RESULT([$zfsconfig]);
-	. ./config/$zfsconfig
-
 	TOPDIR=`/bin/pwd`
 	BUILDDIR=$ZFS_META_NAME #+$zfsconfig
 	ZFSDIR=$TOPDIR/$BUILDDIR
@@ -30,6 +27,13 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 	AC_SUBST(LIBDIR)
 	AC_SUBST(CMDDIR)
 	AC_SUBST(UNAME)
+
+	AC_MSG_RESULT([$zfsconfig]);
+	. ./config/$zfsconfig
+
+	AC_SUBST(KERNELMAKE_PARAMS)
+	AC_SUBST(KERNELCPPFLAGS)
+	AC_SUBST(HOSTCFLAGS)
 ])
 
 AC_DEFUN([ZFS_AC_KERNEL], [