Re: Use of %td in printf

[Paul Eggert]

Eli Zaretskii wrote:
> AFAIR, we require a C99 compiler, but not a C99 C library.

That was a while ago. These days it's safe to assume %td and Emacs has been 
doing so for some time without any problems.

I should mention that the situation is more complicated than "we require a C99 
compiler". Emacs does not require full support for C99, either in the compiler 
or the library. (If it did, we couldn't use Microsoft's C compiler, which does 
not support all of C99.) Emacs does assume many C99 features, though, and %td 
has been one of these features for a while.

While we're on the topic, one of these days I was thinking of removing 
printmax_t and related types and macros from src/lisp.h, as %jd is considerably 
simpler and should be universal by now. Even when I added that stuff back in 
2011 the concern about portability to old C libraries lacking %jd support was 
mostly theoretical; I think the last holdout was Solaris 8, which Oracle stopped 
supporting in 2012. Nowadays those pre-C99 libraries are museum pieces and we 
can drop the printmax_t hacks.