Le 11/07/2022 à 23:48, Segher Boessenkool a écrit :

Hi!

On Mon, Jul 11, 2022 at 05:32:09PM +0000, Christophe Leroy wrote:

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Le 11/07/2022 à 18:14, Segher Boessenkool a écrit :

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     CC      arch/powerpc/kernel/irq.o
{standard input}: Assembler messages:
{standard input}:3535: Error: unrecognized opcode: `wrteei'
{standard input}:5608: Error: unrecognized opcode: `wrteei'

What -mcpu= did it use here?

-mcpu=powerpc64

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wrteei is not a PowerPC insn (it is BookE, instead), so it is not
recognised without an appropriate -mcpu=.

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If I select the e5500 (without altivec) or e6500 I get:

     CC      arch/powerpc/kernel/io.o
{standard input}: Assembler messages:
{standard input}:381: Error: unrecognized opcode: `eieio'

Same question.  eieio is a base PowerPC instruction, so this one is
"interesting" :-)

-mcpu=e500mc64 (for e5500)
-mcpu=e6500 (for e6500)

I had to replace 'eieio' instruction by 'mbar' instruction.

I saw some patches fly by...  you have it all fixed with that?

Yes it fixed all build failures with GCC 12.

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Seems like binutils added 'eieio' to e500 in 2010 via commit
e01d869a3be, but it seems it is only for the 85xx, not for the others.

I believe the eieio instruction is disabled on some e500 models, because
it does not work correctly, so EIEIO_EN=1 cannot work, something like
that?

Don't know.

It is also disabled on 405 and 440.

That's new with GCC 12.

Christophe