Hi Paul,

On Wed, Jun 12, 2024 at 07:55:14AM GMT, Paul Eggert wrote:

On 2024-06-12 05:16, Alejandro Colomar wrote:

quoted

tcgets.c:53:24:
  error: implicit conversion changes signedness: 'int' to 'tcflag_t' (aka
  'unsigned int') [clang-diagnostic-sign-conversion,-warnings-as-errors]

This is a bug in Clang not glibc, and if you're worried about it I suggest
sending a bug report to the Clang folks about the false positive.

Even GCC's -Wsign-conversion, which is at least smart enough to not warn
about benign conversions like that, is too often so chatty that it's best
avoided.

A lot of this stuff is pedanticism that dates back to the bad old days when
the C standard allowed ones' complement and signed magnitude representations
of signed integers. Although it can be amusing to worry about that
possibility (I know I've done it) it's never been a practical worry, and
even the motivation of pedanticism is going away now that C23 requires two's
complement.

I know; I think I have -Weverything enabled in that run, which is known
for its pedanticity.  I usually disable it when it triggers a warning,
since they are usually nonsense.  But in this case, adding U is a net
improvement, without downsides (or I can't see them).

So, while the kernel and glibc are just fine with this implicit
conversion, they would be equally fine and even better without the
conversion.  Not a bug, but rather a slight improvement.

Have a lovely day!
Alex

-- 
<https://www.alejandro-colomar.es/>