Date: Fri, 1 Jun 2018 08:01:11 +0200 From: Markus Wichmann <nullplan@....net> To: musl@...ts.openwall.com Subject: Re: [PATCH] printf: handle the L modifier for integers On Fri, Jun 01, 2018 at 12:56:55AM +0300, Andrei Vagin wrote: > The L modifier is usually used for floating-point numbers, but > glibc allows to use this modifier for integers too. > Nice for them. Looking forward to seeing how they deal with any possible future standard definition of %Ld. Probably the same ugly way they deal with signal() and scanf(), i.e. provide different #defines for them based on feature flags. > I think here is nothing wrong if we will be compatible with glibc here. > Yes there is, and it was just explained: It breaks forward compatibility. > It is not often when a error code of printf is checked, so we may have > a situation when a code works with glibc and doesn't work with musl. > Correct solution is then to detect this abuse of the interface and to crash. That is something the programmer can't ignore. Code "working" with one implementation and not with another is a little thing known as undefined behavior. Good programmers avoid it. Ciao, Markus
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