------- Comment #10 from jakub at gcc dot gnu dot org 2009-04-28 23:51 ------- I disagree, while the modifiers are perhaps undocumented, there is tons of software in the wild that uses them heavily (I don't know about %z, but many other modifiers) and breaking that all would be a terrible idea. Look at longlong.h for examples, glibc, Linux kernel just to name a few. Just do find . -name \*.[ch] | xargs grep '[^%]%[a-zA-Z][0-9]' and you'll see lots of those (of course with some false positives, but those are easily recognizable), on many different targets. The right thing is just to document them.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39949
