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Bug 2056691

Summary: Building with -mcpu=native on new Arm type fails
Product: Red Hat Enterprise Linux 8 Reporter: Peter Rival <frival>
Component: binutilsAssignee: Nick Clifton <nickc>
binutils sub component: system-version QA Contact: Miloš Prchlík <mprchlik>
Status: CLOSED ERRATA Docs Contact:
Severity: high    
Priority: unspecified CC: ahajkova, bgray, dmalcolm, dshaks, efuller, fweimer, gcase, jakub, jbastian, mcermak, mpolacek, mprchlik, nickc, ohudlick, sipoyare, tumeya, vkadlcik
Version: 8.5Keywords: FutureFeature, Triaged
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: ---   
Hardware: aarch64   
OS: Linux   
Whiteboard:
Fixed In Version: binutils-2.30-115.el8 Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of:
: 2071038 (view as bug list) Environment:
Last Closed: 2022-11-08 10:45:15 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2071038    

Comment 8 Nick Clifton 2022-04-01 16:24:58 UTC 
OK, this is a binutils problem.

We need to backport this commit to the assembler:

https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=af4bcb4ce6939da1738c847a06789d2223b67ca4

and then additionally the patch that allows the rng extension to be used without armv8.5:

https://sourceware.org/pipermail/binutils/2022-March/120304.html
Comment 9 Nick Clifton 2022-04-05 10:49:14 UTC 
Fixed in binutils-2.30-115.el8
Comment 19 Miloš Prchlík 2022-05-19 11:57:03 UTC 
Verified with binutils-2.30-116.el8 reproducer from comment #5:

$ cat x.c
int
main ()
{
}
$ 

$ cat flags
processor       : 0
BogoMIPS        : 2100.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm ssbs dcpodp svei8mm svebf16 i8mm bf16 dgh rng
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x1
CPU part        : 0xd40
CPU revision    : 1
$ 

$ GCC_CPUINFO=flags gcc x.c -mcpu=native
Assembler messages:
Error: unknown architectural extension `rng+nodotprod+nofp16fml'
Error: unrecognized option -march=armv8.4-a+crypto+rcpc+sha3+sm4+sve+rng+nodotprod+nofp16fml
$ 

$ GCC_CPUINFO=flags gcc x.c -mcpu=native
$
Comment 23 errata-xmlrpc 2022-11-08 10:45:15 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (binutils bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7693