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
