FIX: updated build scripts to be compatible with the recent CHECKSUM change

Author: Oldes

src/tools/common.reb

@@ -47,6 +47,20 @@ if exists? opts: temp-dir/tmp-options.reb [
 
 
 ;-- UTILITIES ----------------------------------------------------------
+; using checksum mezzanines to be able use build scripts also with old Rebol versions
+needs-new-checksum-version?: error? try [checksum #{}]
+crc24: func[data [binary!]] either needs-new-checksum-version? [
+	[checksum data 'crc24]
+][	; old R2 compatible:
+	[checksum data]
+]
+; for some reason extensions are tested agains IP checksum :-/
+ipc: func[data [binary!]] either needs-new-checksum-version? [
+	[checksum data 'tcp]
+][	; old R2 compatible:
+	[checksum/tcp data]
+]
+
 
 error: func[msg [string! block!]][
 	if block? msg [msg: reform msg]

src/tools/make-boot.reb

@@ -1184,7 +1184,7 @@ emit [
 {
 #define MAX_NATS      } nat-count {
 #define NAT_SPEC_SIZE } length? comp-data {
-#define CHECK_TITLE   } checksum to binary! title {
+#define CHECK_TITLE   } crc24 to binary! title {
 
 extern const REBYTE Native_Specs[];
 extern const REBFUN Native_Funcs[];

src/tools/make-os-ext.reb

@@ -147,11 +147,13 @@ foreach file files [
 
 remit "} REBOL_HOST_LIB;"
 
+;@@ TODO: there is used IP checksum form HOST_LIB
+;@@ but CRC24 for boot data
 out: rejoin [
 	form-header/gen "Host Access Library" %host-lib.h %make-os-ext.reb
 {
 #define HOST_LIB_VER } lib-version {
-#define HOST_LIB_SUM } checksum/tcp to-binary xsum {
+#define HOST_LIB_SUM } ipc to-binary xsum {
 #define HOST_LIB_SIZE } cnt {
 
 extern REBDEV *Devices[];