Re: [dpdk-stable] [PATCH v2] build: explicitly enable sse4 for meson builds

[Bruce Richardson <bruce.richardson@intel.com>]

+stable

This patch is probably worthwhile taking into 19.11 and 18.11 branches to
reduce chances of failures on CI of stable trees.

On Mon, Dec 23, 2019 at 10:38:40AM +0000, Bruce Richardson wrote:
> If the compiler does not recognise the specific CPU when building with the
> default "native" machine type, sse4.2 instructions can be missing, causing
> a build error. Rather than advising the user to change the machine type,
> we can just turn on SSE4.2 directly. This can prevent issues with running
> automated tests with older compilers/distros on newer hardware.
> 
Cc: stable@dpdk.org
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
> V2: insert missing quotes around "-msse4"
> ---
>  config/x86/meson.build | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/config/x86/meson.build b/config/x86/meson.build
> index 8b0fa3e6f..adc857ba2 100644
> --- a/config/x86/meson.build
> +++ b/config/x86/meson.build
> @@ -15,11 +15,9 @@ if not is_windows
>  endif
>  
>  # we require SSE4.2 for DPDK
> -sse_errormsg = '''SSE4.2 instruction set is required for DPDK.
> -Please set the machine type to "nehalem" or "corei7" or higher value'''
> -
>  if cc.get_define('__SSE4_2__', args: machine_args) == ''
> -	error(sse_errormsg)
> +	message('SSE 4.2 not enabled by default, explicitly enabling')
> +	machine_args += '-msse4'
>  endif
>  
>  base_flags = ['SSE', 'SSE2', 'SSE3','SSSE3', 'SSE4_1', 'SSE4_2']
> -- 
> 2.24.1
>