Enable building of picobsd using CURRENT sources again.

Following a suggestion by Ruslan, the initial creation of the
includes and libraries (and build tools) is now done by
invoking "make buildworld" (with -DPICOBSD which eventually will
limit the amount of stuff built with a 2-line change in Makefile.inc1).
The correct environment is then used for subsequent builds.

Also remove write_mfs_in_kernel.c in favour of using dd

All the above is conditional on __FreeBSD_version, as the previous
method still worked for versions earlier than 500035, and I am
unsure on how the "new" method works for earlier versions.

Finally, note that the crunch.conf files need some work because
some libraries (e.g. gmd) have gone away from the base installation.

release/picobsd/build/picobsd

@@ -144,6 +144,15 @@ set_defaults() {
     free_vnode			# cleanup old vnodes
 }
 
+create_includes_and_libraries2() {
+    log "create_includes_and_libraries2() for ${SRC}"
+    MAKEOBJDIRPREFIX=${l_objtree}
+    export MAKEOBJDIRPREFIX
+    ( cd ${SRC};
+    make -DNOCLEAN -DNOPROFILE -DNOGAMES -DNOLIBC_R -DPICOBSD buildworld
+    )
+}
+
 create_includes_and_libraries() {
     log "create_includes_and_libraries() for ${SRC}"
     # Optionally creates include directory and libraries.
@@ -263,6 +272,12 @@ build_image() {
     PICO_OBJ=${l_objtree}/picobsd/${THETYPE}
     log "PICO_OBJ is ${PICO_OBJ}"
 
+    if [ ${OSVERSION} -ge 500035 ] ; then
+	MAKEOBJDIRPREFIX=${l_objtree}
+	export MAKEOBJDIRPREFIX
+	log `cd ${SRC}; make -f Makefile.inc1 -V WMAKEENV`
+	eval export `cd ${SRC}; make -f Makefile.inc1 -V WMAKEENV`
+    fi
     # create build directory and subtree
     mkdir -p ${BUILDDIR}/crunch
     # remove any old stuff
@@ -435,7 +450,8 @@ Your options:\n\
 # invoke the Makefile to compile the kernel.
 do_kernel() {		# OK
     log "do_kernel() Preparing kernel \"$name\" in $MY_TREE"
-    (cd $MY_TREE; export name SRC CONFIG BUILDDIR # used in this makefile ;
+    (cd $MY_TREE; export name SRC BUILDDIR # used in this makefile ;
+	# export CONFIG
 	if [ "${o_do_modules}" = "yes" ] ; then
 		MODULES=""
 		export MODULES
@@ -572,7 +588,8 @@ populate_mfs_tree() {
 	make -m ${SRC}/share/mk \
 		-v -f ${PICO_TREE}/build/Makefile.conf ${BUILDDIR}/crunch.mk )
     log "Libs are ${LIBS} "
-    export SRC LIBS CFLAGS # used by crunch.mk
+    export SRC # used by crunch.mk
+    # export LIBS CFLAGS
     log "Now make -f crunch.mk"
     make -m ${SRC}/share/mk ${o_makeopts} -f ${BUILDDIR}/crunch.mk
     strip --remove-section=.note --remove-section=.comment crunch1
@@ -793,22 +810,12 @@ fill_floppy_image() {
 
     (
     cd ${BUILDDIR}
-    log "Preload kernel with file ${c_fs}"
-if [ true ] ; then
-    if [ -f ${PICO_TREE}/build/write_mfs_in_kernel.c ] ; then
-	cc -o wmk ${PICO_TREE}/build/write_mfs_in_kernel.c
-    else
-	cc -o wmk ${PICO_TREE}/../write_mfs_in_kernel.c
-    fi
-    ./wmk kernel ${c_fs} || fail $? no_mfs
-    rm wmk
-else	# not working yet, just a reminder
-    objdump -h kernel
-    objcopy --remove-section=md_root kernel
-    objcopy --add-section md_root=${c_fs} kernel
-    objcopy --set-section-flags md_root=contents,alloc,load,data kernel
-    objdump -h kernel
-fi
+    # $1 takes the offset of the MFS filesystem
+    set `strings -at d kernel | grep "MFS Filesystem goes here"`
+    mfs_ofs=$(($1 + 8192))
+    log "Preload kernel with file ${c_fs} at ${mfs_ofs}"
+    dd if=${c_fs} ibs=8192 iseek=1 of=kernel obs=${mfs_ofs} \
+	oseek=1 conv=notrunc
     log "Compress with kgzip and copy to floppy image"
     kgzip -o kernel.gz kernel
     cp -p kernel.gz ${dst}/kernel || fail $? no_space "copying kernel"
@@ -830,7 +837,7 @@ fi
 }
 
 # This function creates variables which depend on the source tree in use:
-# SRC, l_usrtree, l_objtree LIBS, CFLAGS
+# SRC, l_usrtree, l_objtree
 # Optionally creates libraries, includes and the like (for cross compiles,
 # needs to be done once).
 
@@ -843,16 +850,25 @@ set_build_parameters() {
     fi
     l_objtree=${l_usrtree}/obj-pico
     PICO_TREE=${PICO_TREE:-${SRC}/release/picobsd}
-
+    set `grep "#define[\t ]__FreeBSD_version" ${SRC}/sys/sys/param.h`
+    OSVERSION=$3
+    logverbose "OSVERSION is ${OSVERSION}"
     if [ "${o_init_src}" != "" ] ; then
-	create_includes_and_libraries
+	if [ ${OSVERSION} -lt 500035 ] ; then
+	    create_includes_and_libraries
+	else
+	    create_includes_and_libraries2
+	fi
+    fi
+    if [ ${OSVERSION} -lt 500035 ] ; then
+	# Create the right LIBS and CFLAGS for further builds.
+	# and build the config program
+	LIBS="-L${l_usrtree}/lib"
+	CFLAGS="-nostdinc -I${l_usrtree}/include"
+	export LIBS CFLAGS
+	CONFIG=${l_usrtree}/sbin/config
+	export CONFIG
     fi
-    # Create the right LIBS and CFLAGS for further builds.
-    # and build the config program
-    LIBS="-L${l_usrtree}/lib"
-    CFLAGS="-nostdinc -I${l_usrtree}/include"
-    export LIBS CFLAGS
-    CONFIG=${l_usrtree}/sbin/config
 }
 
 #-------------------------------------------------------------------