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

[Hans Wennborg]

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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