Re: macos ventura SDK spews warnings

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: macos ventura SDK spews warnings
Date: 2022-10-16 16:40:11
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Andres Freund <andres(at)anarazel(dot)de> writes:
> On 2022-10-15 21:00:00 -0400, Tom Lane wrote:
>> After further thought, I think the best compromise is just that:
>> (1) apply s/sprintf/snprintf/ patch in branches back to v12, where
>> we began to require C99.
>> (2) in v11 and back to 9.2, enable -Wno-deprecated if available.

> Makes sense to me.

I remembered another reason why v12 should be a cutoff: it's where
we started to use snprintf.c everywhere. In prior branches, there'd
be a lot of complaints about sprintf elsewhere in the tree.

So I pushed (1), but on the way to testing (2), I discovered a totally
independent problem with the 13.0 SDK in older branches:

In file included from ../../../src/include/postgres.h:46:
In file included from ../../../src/include/c.h:1387:
In file included from ../../../src/include/port.h:17:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX13.0.sdk/usr/include/netdb.h:91:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX13.0.sdk/usr/include/netinet/in.h:81:
/Library/Developer/CommandLineTools/SDKs/MacOSX13.0.sdk/usr/include/sys/socket.h:471:1: error: expected ';' after top level declarator
__CCT_DECLARE_CONSTRAINED_PTR_TYPES(struct sockaddr_storage, sockaddr_storage);

This is apparently some sort of inclusion-order problem, which is probably
a bug in the SDK --- netdb.h and netinet/in.h are the same as they were in
SDK 12.3, but sys/socket.h has a few additions including this
__CCT_DECLARE_CONSTRAINED_PTR_TYPES macro, and evidently that's missing
something it needs. I haven't traced down the cause of the problem yet.
It fails to manifest in v15 and HEAD, which I bisected to

98e93a1fc93e9b54eb477d870ec744e9e1669f34 is the first new commit
commit 98e93a1fc93e9b54eb477d870ec744e9e1669f34
Author: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Date: Tue Jan 11 13:46:12 2022 -0500

Clean up messy API for src/port/thread.c.

The point of this patch is to reduce inclusion spam by not needing
to #include <netdb.h> or <pwd.h> in port.h (which is read by every
compile in our tree). To do that, we must remove port.h's
declarations of pqGetpwuid and pqGethostbyname.

I doubt we want to back-patch that, so what we'll probably end up with
is adding some #includes to port.h in the back branches. Bleah.
Or we could file a bug with Apple and hope they fix it quickly.
(They might, actually, because this SDK is supposedly beta.)

regards, tom lane

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