Don't build+use wart if the target arch is incompatible

If the target CPU architecture is incompatible with the host, don't try to build and use wart to generate ckcpro.c from ckcpro.w - either rely on ckcpro.c already being up-to-date or the user supplying a compatible wart and setting WART and CKB_USE_WART=yes

kermit/k95/ckoker.mak

@@ -137,6 +137,15 @@ CL = wcl386
 !message  Platform:                 $(PLATFORM)
 !message  Build:                    $(K95BUILD)
 !message  Architecture:             $(TARGET_CPU)
+!if "$(CROSS_BUILD)" == "yes"
+!if "$(CROSS_BUILD_COMPATIBLE)" == "yes"
+!message  Host Architecture:        $(HOST_CPU) (cross-compiling to compatible architecture)
+!else
+!message  Host Architecture:        $(HOST_CPU) (cross-compiling)
+!endif
+!else
+!message  Host Architecture:        $(HOST_CPU)
+!endif
 !message  Compiler:                 $(COMPILER)
 !message  Compiler Version:         $(COMPILER_VERSION)
 !message  Compiler Target Platform: $(TARGET_PLATFORM)
@@ -1103,9 +1112,6 @@ k2crypt.dll: ck_crp.obj ck_des.obj ckclib.obj k2crypt.def ckoker.mak
             /out:$@ ck_crp.obj ck_des.obj ckclib.obj libdes.lib
         dllrname $@ CPPRMI36=CKO32RTL
 
-ckwart.exe: ckwart.obj $(DEF)
-	$(CC) ckwart.obj
-
 docs:   ckermit.inf
 
 # ckotel.def
@@ -1358,12 +1364,32 @@ p_tl$(O):      ckcdeb.h ckoker.h ckclib.h ckocon.h p_tl.c     p_type.h p_tl.h p_
 p_omalloc$(O): ckcdeb.h ckoker.h ckclib.h p_omalloc.c p_type.h p_error.h p.h
 !endif
 
+# We're not always able to build and use WART so only do it if we're told to.
+!if "$(CKB_BUILD_WART)" == "yes"
 ckcpro.c:	ckcpro.w ckwart.exe
 #		$(MAKE) -f ckoker.mak ckwart.exe \
 #		  CC="$(CC) $(CC2)" OUT="$(OUT)" O="$(O)" OPT="$(OPT)" \
 #		  DEBUG="$(DEBUG)" CFLAGS="-DCK_ANSIC $(CFLAGS)" LDFLAGS="$(LDFLAGS)"
 		ckwart ckcpro.w ckcpro.c
 
+ckwart$(O):     ckwart.c
+	$(CC) -c ckwart.c
+
+
+ckwart.exe: ckwart.obj $(DEF)
+	$(CC) ckwart.obj
+
+!elseif "$(CKB_USE_WART)" == "yes"
+
+!if "$(WART)" == ""
+WART=ckwart
+!endif
+
+ckcpro.c: ckcpro.w
+		$(WART) ckcpro.w ckcpro.c
+
+!endif
+
 ckopcf$(O):     ckopcf.c ckopcf.h
 	$(CC) $(CC2) $(CFLAGS) $(DEBUG) $(OPT) $(DLL) -c ckopcf.c
 
@@ -1373,8 +1399,6 @@ ckotel$(O):     ckotel.c
 ckoclip$(O):     ckoclip.c
 	$(CC) $(CC2) $(CFLAGS) $(DEBUG) $(OPT) /Gn- -c ckoclip.c
 
-ckwart$(O):     ckwart.c
-	$(CC) -c ckwart.c
 
 #cko32rt$(O):     cko32rt.c
 #        /Gd+ /Ge- $(DLL) -c cko32rt.c

kermit/k95/compiler_detect.mak

@@ -287,4 +287,37 @@ TARGET_CPU = x86
 
 !ENDIF
 
+# Figure out the host CPU Architecture
+HOST_CPU = $(PROCESSOR_ARCHITECTURE)
+!if "$(HOST_CPU)" == "AMD64"
+HOST_CPU = x86-64
+!endif
+
+# And if we're cross-compiling from a CPU architecture
+# other than the target.
+CROSS_BUILD = no
+!if "$(HOST_CPU)" != "$(TARGET_CPU)"
+CROSS_BUILD = yes
+!endif
+
+# And if we're cross-compiling, can we
+CROSS_BUILD_COMPATIBLE = yes
+!if "$(CROSS_BUILD)" == "yes"
+# We're cross-compiling.
+
+!if "$(HOST_CPU)" == "x86-64" && "$(TARGET_CPU)" == "x86"
+CROSS_BUILD_COMPATIBLE = yes
+
+!elseif "$(HOST_CPU)" == "ARM64" && "$(TARGET_CPU)" == "ARM"
+# TODO: Is this actually true? Do the compilers even run on these architectures?
+CROSS_BUILD_COMPATIBLE = yes
+
+!else
+# x86 can't run x86-64 code for example.
+CROSS_BUILD_COMPATIBLE = no
+
+!endif
+
+!endif
+
 !endif

kermit/k95/feature_flags.mak

@@ -188,6 +188,9 @@ CKF_XYZ=no
 CKF_SRP=no
 # TODO: Figure out SRP support on OS/2 with OpenWatcom
 
+!message Turning Kerberos off - no Watcom support yet.
+CKF_K4W=no
+
 !endif
 
 !if "$(CKF_SSH)" == "yes"
@@ -224,6 +227,29 @@ CKF_DECNET=yes
 CKF_DECNET=no
 !endif
 
+# Build and use wart to generate ckcpro.c from ckcpro.w unless we're told
+# not to
+!if "$(CKB_BUILD_WART)" != "no"
+CKB_BUILD_WART=yes
+!endif
+
+# ... or unless we're targeting a CPU architecture incompatible with that of
+# the host machine.
+!if "$(CROSS_BUILD_COMPATIBLE)" == "no"
+!message Forcing build of WART off - target CPU architecture is incompatible
+!message with host architecture. To generate ckcpro.c from ckcpro.w, supply
+!message a version of ckwart.exe compatible with the host architecture and
+!message set CKB_USE_WART=yes
+CKB_BUILD_WART=no
+!endif
+
+!if "$(CBK_BUILD_WART)" == "yes"
+CKB_USE_WART=yes
+WART=ckwart
+!endif
+
+
+
 # Other features that should one day be turned on via feature flags once we
 # figure out how to build them and get any dependencies sorted out.
 #