From: Tom Lane <tgl@sss.pgh.pa.us>
To: James Hilliard <james.hilliard1@gmail.com>
cc: pgsql-hackers@lists.postgresql.org
Subject: Re: [PATCH 1/1] Fix compilation on mac with Xcode >= 11.4.
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Comments: In-reply-to James Hilliard <james.hilliard1@gmail.com>
	message dated "Thu, 19 Nov 2020 18:55:18 -0700"
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Date: Thu, 19 Nov 2020 21:20:11 -0500
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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 Inte=
l).
>> 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