Re: [PATCH 1/1] Fix compilation on mac with Xcode >= 11.4.

James Hilliard <james.hilliard1@gmail.com> writes:
> On Thu, Nov 19, 2020 at 6:04 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> The cases we've got in the buildfarm are Xcode 12.0 on Catalina (10.15.7)
>> and Xcode 12.2 on Big Sur (11.0.1 ... although that one is ARM not Intel).
>> Maybe you're found some corner case in between those, but I guess it's
>> more likely due to a configuration choice.

> I guess to verify one could try compiling with Xcode 12.2 on catalina 10.15.7.

To check this, I updated my laptop (still on Catalina 10.15.7) to latest
Xcode, 12.2 (12B45b), from 12.0 --- and behold, I could duplicate it:

Undefined symbols for architecture x86_64:
  "___darwin_check_fd_set_overflow", referenced from:
      _ClientAuthentication in auth.o
      _pgstat_init in pgstat.o
      _ServerLoop in postmaster.o
ld: symbol(s) not found for architecture x86_64

However ... it then occurred to me to blow away my ccache and accache,
and after rebuilding from scratch, everything's fine.  So, are you
using ccache?

            regards, tom lane