Local type inference with auto is in C2X

[Michael Matz]

Hello,

On Thu, 3 Nov 2022, Florian Weimer via Gcc wrote:

> will not have propagated widely once GCC 13 releases, so rejecting
> implicit ints in GCC 13 might be too early.  GCC 14 might want to switch
> to C23/C24 mode by default, activating auto support, if the standard
> comes out in 2023 (which apparently is the plan).
> 
> Then we would go from
> warning to changed semantics in a single release.
> 
> Comments?

I would argue that changing the default C mode to c23 in the year that 
comes out (or even a year later) is too aggressive and early.  Existing 
sources are often compiled with defaults, and hence would change 
semantics, which seems unattractive.  New code can instead easily use 
-std=c23 for a time.

E.g. c99/gnu99 (a largish deviation from gnu90) was never default and 
gnu11 was made default only in 2014.


Ciao,
Michael.