> -----Original Message----- > From: dev <[email protected]> On Behalf Of Bruce Richardson > Sent: Thursday, June 18, 2020 12:57 PM > To: [email protected] > Cc: Yigit, Ferruh <[email protected]>; [email protected]; Richardson, > Bruce <[email protected]> > 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 <[email protected]>
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 <[email protected]>
