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From: Tom Lane <[email protected]>
To: John Naylor <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: pgsql: Inline CRC computation for small fixed-length input on x86
Date: Mon, 31 Mar 2025 09:33:48 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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	<[email protected]>
	<[email protected]>

I wrote:
>> What I conclude is that Red Hat hot-wired gcc to assume -msse4.2,
>> but they didn't hot-wire clang the same way.

> In confirmation of that: everything goes through fine if I manually
> add -msse4.2 to configure's choice of BITCODE_CFLAGS.

Also, possibly useful for testing purposes: I can reproduce the
build failure on RHEL8, and probably elsewhere, with

./configure CFLAGS="-O2 -msse4.2" --with-llvm

In this form it's clearly pilot error, because I didn't do anything
to put -msse4.2 into CXXFLAGS.  But this is another way of confirming
that the underlying problem is different default -m switches between
gcc and clang.  I'm kind of surprised we have not gotten bitten by
that before.

			regards, tom lane

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