http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56271
--- Comment #4 from Karlson2k <k2k at narod dot ru> 2013-02-20 21:29:06 UTC --- While this fix is OK in most cases, there is more correct fix. 'filter-out' use first argument as space separated list. Consider that WARN_CFLAGS is "-Wall -pedantic" (including double quotes). If any other variable has same words, for example CFLAGS was set to "-O3 -pedantic", that those words will be filtered out with quotes ( -pedantic" ) and 'make' will lose opening or closing quote. Better to use $(subst $(WARN_CFLAGS),,$(FLAGS_TO_PASS)) as it will replace whole string, not word by word.
