added diff build option

Source/HBIOS/Build.sh

@@ -5,6 +5,19 @@ set -e
 
 CPMCP=../../Tools/`uname`/cpmcp
 
+timestamp=$(date +%Y-%m-%d)
+#timestamp="2020-02-24"
+
+if [ $1 == '-d' ] ; then
+	shift
+	diffdir=$1
+	shift
+	if [ -f $diffdir/build.inc ] ; then
+		timestamp=$(grep TIMESTAMP $diffdir/build.inc | awk '{print $3}' | tr -d '\015"')	
+		echo diff build using $timestamp
+	fi	
+fi
+
 # positional arguments
 platform=$1
 config=$2
@@ -45,8 +58,6 @@ else
 fi
 
 Apps=(assign fdu format mode osldr rtc survey syscopy sysgen talk timer xm inttest)
-timestamp=$(date +%Y-%m-%d)
-#timestamp="2020-02-24"
 
 blankfile=Blank${romsize}KB.dat
 romdiskfile=RomDisk.tmp

Source/HBIOS/Makefile

@@ -31,6 +31,11 @@ DEST = ../../Binary
 TOOLS =../../Tools
 OTHERS =  *.img *.rom *.com *.bin *.z80 cpm.sys zsys.sys Build.inc
 include $(TOOLS)/Makefile.inc
+
+ifeq ($(DIFFMAKE),1)
+	DIFFBUILD := -d $(DIFFTO)/Source/HBIOS
+endif
+
 DIFFPATH = $(DIFFTO)/Binary
 
 
@@ -39,7 +44,7 @@ ROMSIZE=512
 N8_std.rom: ROMSIZE=512
 
 %.rom:
-	bash Build.sh $(shell echo $* | tr '_' ' ') $(ROMSIZE)
+	bash Build.sh $(DIFFBUILD) $(shell echo $* | tr '_' ' ') $(ROMSIZE)
 
 #ZETA2_std.rom:
 #	bash Build.sh ZETA2 std 512