Provide a new picobsd option, "--modules", to also build modules

(modload and friends are sufficiently small to consider their inclusion
in PicoBSD images).

release/picobsd/build/Makefile.conf

@@ -11,6 +11,10 @@
 
 SRC?=/usr/src
 CONFIG?=config
+MODULES?=-DNO_MODULES	# do not build them as a default
+
+# caller will set MODULES to empty if modules are needed.
+# Indeed, it can be used to specify other Makefile options as well.
 
 # These 3 variables determine where the kernel is built.
 # If config were smart enough, we could place the config
@@ -34,11 +38,11 @@ ${BUILDDIR}/kernel: ${KERNFILE}
 ${KERNFILE}: ${COMPILE} do_a_make_in_the_kernel_directory_anyways
 
 do_a_make_in_the_kernel_directory_anyways:
-	(cd ${COMPILE}; make KERNEL=kernel -DNO_MODULES)
+	(cd ${COMPILE}; make KERNEL=kernel ${MODULES} )
 
 ${COMPILE}: ${CONF}/${CONFFILE}
 	(cd ${CONF}; ${CONFIG} -d ${COMPILE} ${CONFFILE}; \
-	cd ${COMPILE}; make KERNEL=kernel -DNO_MODULES depend )
+	cd ${COMPILE}; make KERNEL=kernel ${MODULES} depend )
 
 ${CONF}/${CONFFILE}: PICOBSD
 	# -mkdir -p ${CONF}		# XXX not needed yet.

release/picobsd/build/picobsd

@@ -100,6 +100,7 @@ set_defaults() {
     o_init_src=""		# non "" if we need to init libs and includes.
     o_makeopts=${MAKEOPTS:--s}	# make options, be silent by default
     o_no_devfs=yes		# we do not want devfs
+    o_do_modules=""		# do not build modules
 
     SRC="/usr/src"		# default location for sources
     c_startdir=`pwd`	# directory where we start
@@ -397,6 +398,11 @@ this as small as possible. " 10 70 2> ${c_reply} \
 do_install() {
     log "do_install()"
 
+    if [ "${o_interactive}" = "NO" ] ; then
+	echo "+++ Build completed +++"
+	cat .build.reply
+	return
+    fi
     dialog --title "Build ${THETYPE} completed" --inputbox \
 "\nThe build process was completed successfuly.\n\
 `cat .build.reply` \n\n\
@@ -424,6 +430,10 @@ Your options:\n\
 do_kernel() {		# OK
     log "do_kernel() Preparing kernel \"$name\" in $MY_TREE"
     (cd $MY_TREE; export name SRC CONFIG BUILDDIR # used in this makefile ;
+	if [ "${o_do_modules}" = "yes" ] ; then
+		MODULES=""
+		export MODULES
+	fi
 	make -v -f ${PICO_TREE}/build/Makefile.conf ) || \
 	fail $? missing_kernel
 }
@@ -830,6 +840,9 @@ while [ true ]; do
 	o_all_in_mfs=""
 	;;
 
+    --modules)	# also build kernel modules
+	o_do_modules="yes"
+	;;
     -n)
 	o_interactive="NO"
 	;;