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Increase minimum clang version requirement for rsaz-avx512.pl

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The reason is that clang-6 does not enable proper -march flags by
default for assembly modules (rsaz-avx512.pl requires avx512ifma, avx512dq,
avx512vl, avx512f). This is not true for newer clang versions - clang-7 and
further work ok.

For older clang versions users who want to get optimization from this
file, we have a note in the OPENSSL_ia32cap.pod with the workaround that
proposes having a wrapper that forces using external assembler.

Fixes #14668: clang-6.0.0 build broken

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14671)
This commit is contained in:
Andrey Matyukov 2021-03-24 10:05:29 +03:00 committed by Tomas Mraz
parent 1ee1a169c3
commit 788a72e92f
1 changed files with 1 additions and 1 deletions
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crypto/bn/asm/rsaz-avx512.pl
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@ -49,7 +49,7 @@ if (!$avx512 && $win64 && ($flavour =~ /nasm/ || $ENV{ASM} =~ /nasm/) &&
}
if (!$avx512 && `$ENV{CC} -v 2>&1` =~ /((?:clang|LLVM) version|.*based on LLVM) ([0-9]+\.[0-9]+)/) {
$avx512ifma = ($2>=6.0);
$avx512ifma = ($2>=7.0);
}
open OUT,"| \"$^X\" \"$xlate\" $flavour \"$output\""