| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | John Naylor <johncnaylorls(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-committers(at)lists(dot)postgresql(dot)org, cookt(at)blackduck(dot)com |
| Subject: | Re: pgsql: Inline CRC computation for small fixed-length input on x86 |
| Date: | 2025-03-31 13:33:48 |
| Message-ID: | 3871155.1743428028@sss.pgh.pa.us |
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| Lists: | pgsql-committers |
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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