[Bug libc/31470] inttypes.h provides incorrect macro definitions

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31470

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-03-11
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #5 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
CD2 GB-108 is indeed on my list of accepted NB comments requiring
implementation changes - the macro definitions should be changed, with
associated tests added to the glibc testsuite. The general rule that you can
pass a value of the promoted type (or, in certain cases, a signed/unsigned
variant of that type, when the rules for va_arg allow such variations), not
necessarily arising from promotion of a value of the narrower type, was
introduced for N2562 (previously this area was unclear). CD2 GB-108 simply
makes the macros in inttypes.h follow the same rules required to be followed by
direct use of formats such as %hhd.

When %hh / %h formats are used directly, glibc has done the expected narrowing
since 2006 (bug 2509; glibc 2.5; "(process_arg): Fix reading of signed short
and byte values from parameter list."). It's just the macros that now need
fixing.

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