> -----Original Message-----
> From: dev <dev-boun...@dpdk.org> On Behalf Of Bruce Richardson
> Sent: Thursday, June 18, 2020 12:57 PM
> To: dev@dpdk.org
> Cc: Yigit, Ferruh <ferruh.yi...@intel.com>; tho...@monjalon.net; Richardson,
> Bruce <bruce.richard...@intel.com>
> Subject: [dpdk-dev] [PATCH v2] build: check functionality rather than binutils
> version
> Rather than checking the binutils version number, which can lead to
> unnecessary disabling of AVX512 if fixes have been backported to distro
> versions, we can instead check the output of "as" from binutils to see if
> it is correct.
> The check in the script uses the minimal assembly reproduction code posted
> to the public bug tracker for gcc/binutils for those issues [1]. If the
> binutils bug is present, the instruction parameters - specifically the
> displacement parameter - will be different in the disassembled output
> compared to the input. Therefore the check involves assembling a single
> instruction and disassembling it again, checking that the two match.
> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028
> Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>

Tested on binutils 2.30 without backported fixes, can confirm that __AVX512F__ 
define is
not present at meson configure time.

Tested-by: Harry van Haaren <harry.van.haa...@intel.com>

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