Improve 64-bit compiler and platform checks.

Ensure core dumps are enabled during testing.

Makefile.in

@@ -266,7 +266,7 @@ $(PROG): $(OBJS)
 	$(LINK) -o $@ $(OBJS) $(LDLIBS)
 
 test: all
-	(cd test; sh ./run_test.sh) 2>&1 | tee test.log
+	(cd test; ulimit -c unlimited; sh ./run_test.sh) 2>&1 | tee test.log
 
 clean:
 	$(RM) $(PROG) $(OBJS) $(BAKFILES)

config

@@ -82,16 +82,27 @@ fi
 gcc -v 2>&1 | grep lto > /dev/null
 [ $? -eq 0 ] && lto_flag="-flto"
 
-# Check bitness of system
+# Check bitness of system/toolchain
 bitness=`./tst`
-rm -f tst tst.c
 if [ $bitness -lt 8 ]
 then
+	# Hmmm maybe default compilation is 32-bit. Re-try with m64 flag.
+	gcc -m64 tst.c -o tst
+	if [ $? -ne 0 ]
+	then
+		rm -f tst tst.c
 		echo "ERROR:"
 		echo "Only 64-bit platforms are supported."
 		echo ""
 		exit 1
+	fi
+
+	# If m64 compilation succeeds we assume platform to be 64-bit capable but
+	# explicit flag is reqd.
+	# Instead of setting another variable lets cheat by plugging m64 into lto_flag!
+	lto_flag="${lto_flag} -m64"
 fi
+rm -f tst tst.c
 
 while [ "${arg1}" != "" ]
 do