[cfe-commits] [Patch] -Wformat: warn about using length modifiers with %n

Ted Kremenek kremenek at apple.com
Thu Aug 2 10:31:18 PDT 2012

C99 says you can use %n with the length modifiers 'hh', 'h', 'l', 'j', 'z', and 't'.

On Aug 1, 2012, at 6:43 AM, Hans Wennborg <hans at chromium.org> wrote:

> Hi all,
> As far as I know, using any length modifier with %n is undefined
> behavior. For some reason, Clang doesn't think so, but that's probably
> unintentional? The attached patch makes Clang warn about it.
> Please take a look.
> Thanks,
> Hans
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