Re: Fix C23 compiler warning

On 2024-Oct-25, Tom Lane wrote:

> As I recall, we looked at adopting it some years ago and decided it
> was too much churn for the value (seeing that the long-term plan is
> to go to meson only).  Maybe C23 is a reason to rethink, but from
> what I recall of that, it won't be a painless update.

Ah, yeah. That was 2.71 actually:
https://postgr.es/m/3838336.1657985206@sss.pgh.pa.us
1.72 seems to have been released with some fixes from that one.  Per
that thread, the related problem you noticed was with m4, and apparently
it was because macOS ships a version from 2006 (1.4.7).  Here on Debian
bookworm I have m4 1.4.19; maybe macOS has updated its copy now?

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/