> On 17 Jan 2025, at 14:06, Tamar Christina <tamar.christ...@arm.com> wrote:
>
>> -----Original Message-----
>> From: Kyrylo Tkachov <ktkac...@nvidia.com>
>> Sent: Friday, January 17, 2025 1:04 PM
>> To: Tamar Christina <tamar.christ...@arm.com>
>> Cc: GCC Patches <gcc-patches@gcc.gnu.org>; nd <n...@arm.com>; Richard
>> Earnshaw <richard.earns...@arm.com>; ktkac...@gcc.gnu.org; Richard
>> Sandiford <richard.sandif...@arm.com>
>> Subject: Re: [PATCH]AArch64: Drop ILP32 from default elf multilibs after
>> deprecation
>>
>>
>>
>>> On 17 Jan 2025, at 13:56, Tamar Christina <tamar.christ...@arm.com> wrote:
>>>
>>> Hi All,
>>>
>>> Following the deprecation of ILP32 *-elf builds fail now due to -Werror on
>>> the
>>> deprecation warning. This is because on embedded builds ILP32 is part of
>>> the
>>> default multilib.
>>>
>>> This patch removed it from the default target as the build would fail
>>> anyway.
>>>
>>> Cross compiled on aarch64-none-elf and build succeeds now.
>>>
>>> Ok for master?
>>
>> I was going to say that it’s more common to just announce deprecation in the
>> documentation/release notes for one release cycle, to give time for
>> potential users
>> to come forward.
>> If we remove the multilib build now we’d be helping the support bitrot much
>> faster, which would make it harder to restore if such a user does come
>> forward.
>>
>
> The alternative approach would be to suppress the warning during build, the
> downside
> is ofcourse that this warning does not have a unique identifier, so I believe
> we'd have to
> suppress all deprecation warnings:
>
> cc1: error: '-mabi=ilp32' is deprecated [-Werror=deprecated]
>
> But could work..
>
I think if the warning suppression only happened for the ILP32 multilib build
that would be okay.
Other deprecation warnings would be caught in the LP64 build
Kyrill
> Cheers,
> Tamar
>
>> But it also seems odd to build an entire multilib for a deprecated feature
>> so I’m not
>> opposed to it.
>> I don’t know if we document the ILP32 multilib somewhere. If so, it should be
>> updated.
>> In any case the gcc-15 release notes should also mention this change.
>>
>> Thanks,
>> Kyrill
>>
>>>
>>> Sending this out in case there are no objections to the approach
>>>
>>> Thanks,
>>> Tamar
>>>
>>> gcc/ChangeLog:
>>>
>>> * config.gcc (aarch64-*-elf): Drop ILP32 from default multilibs.
>>>
>>> ---
>>> diff --git a/gcc/config.gcc b/gcc/config.gcc
>>> index
>> 55e37146ee0356b67b8a1a09d263eccdf69cd91a..432798d16fdbce099f69821c
>> 3a0ad91905286777 100644
>>> --- a/gcc/config.gcc
>>> +++ b/gcc/config.gcc
>>> @@ -1210,7 +1210,7 @@ aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-
>> rtems*)
>>> esac
>>> aarch64_multilibs="${with_multilib_list}"
>>> if test "$aarch64_multilibs" = "default"; then
>>> - aarch64_multilibs="lp64,ilp32"
>>> + aarch64_multilibs="lp64"
>>> fi
>>> aarch64_multilibs=`echo $aarch64_multilibs | sed -e 's/,/ /g'`
>>> for aarch64_multilib in ${aarch64_multilibs}; do
>>>
>>>
>>>
>>>
>>> --
>>> <rb19161.patch>
>
