Check for warnings during the build.

scripts/xenofarm.sh

@@ -241,6 +241,18 @@ fi
 log Begin response assembly
 timeecho Collecting results
 
+# Check for warnings
+if test -f r/make.pass
+then
+    grep -i warning r/makelog.txt \
+    | grep -v regex\\.c \
+    > r/makewarn.txt
+    if test `wc -l < r/makewarn.txt` -gt 0
+    then
+	mv r/make.pass r/make.warn
+    fi
+fi
+
 cp $BASE/config.cache r/configcache.txt
 for file in $BASE/src/server/testsuite/*.log
 do