Subject: Re: bug#75614: Fix FTBFS on CentOS 8 and CentOS 8 Stream

From: Pádraig Brady <[email-masked]>
Date: Thu, 16 Jan 2025 22:18:22 +0000

On 16/01/2025 21:14, Bruno Haible via GNU coreutils Bug Reports wrote:
> Testing a current coreutils with a current gnulib on CentOS 8 and
> CentOS 8 Stream, I see the same compilation error on both:
> 
>    CC       src/libcksum_avx512_a-cksum_avx512.o
> ../src/cksum_avx512.c: In function 'cksum_avx512':
> ../src/cksum_avx512.c:60:22: warning: implicit declaration of function '_mm512_set_epi8'; did you mean '_mm512_set1_epi8'? [-Wimplicit-function-declaration]
>     shuffle_constant = _mm512_set_epi8 (0, 1, 2, 3, 4, 5, 6, 7, 8,
>                        ^~~~~~~~~~~~~~~
>                        _mm512_set1_epi8
> ../src/cksum_avx512.c:60:20: error: incompatible types when assigning to type '__m512i' {aka '__vector(8) long long int'} from type 'int'
>     shuffle_constant = _mm512_set_epi8 (0, 1, 2, 3, 4, 5, 6, 7, 8,
>                      ^
> make[2]: *** [Makefile:20396: src/libcksum_avx512_a-cksum_avx512.o] Error 1
> 
> The cause is that USE_AVX512_CRC32 was determined to be true at configure
> time, although the compiler does not support all builtin functions used
> by cksum_avx512.c.
> 
> This proposed patch fixed it. I verified that on Ubuntu 24.04 and
> CentOS Stream 9, USE_AVX512_CRC32 remains true.

Ah right, it seems this fails on GCC 8 without your patch.

Pushed.

Marking this as done.

thanks!
Pádraig