Warn if -r or -ep used with backend other than C/C++
Warn if -r or -ep used with backend other than C/C++

cesarsouza/snowball,snowballstem/snowball,snowballstem/snowball,assem-ch/snowball,snowballstem/snowball,cesarsouza/snowball,assem-ch/snowball,JDemler/snowball,kariminf/snowball,kariminf/snowball,assem-ch/snowball,snowballstem/snowball,cesarsouza/snowball,JDemler/snowball,kariminf/snowball,assem-ch/snowball,cesarsouza/snowball,JDemler/snowball,snowballstem/snowball,cesarsouza/snowball,snowballstem/snowball,JDemler/snowball,snowballstem/snowball,kariminf/snowball,JDemler/snowball,cesarsouza/snowball,assem-ch/snowball,JDemler/snowball,snowballstem/snowball,cesarsouza/snowball,kariminf/snowball