llvm dev - Oct 2021 - [PATCH] Add GNU_PROPERTY_1_GLIBC_2_NEEDED

On Wed, Oct 27, 2021 at 11:52 PM Florian Weimer <fweimer at redhat.com>
wrote:
>
> * H. J. Lu via llvm-dev:
>
> > 1. Some binaries which require new ELF features, like DT_RELR, only
> > work with the new glibc binary.  They crash at run-time with the older
> > glibc binaries.
> > 2. Somes binaries compiled with the new language features, like C2X
> > printf specifiers, only generate correct results with the new glibc
> > binary.  Since we don't add new glibc versions to the printf
function
> > family, they generate incorrect results at run-time with the older
> > glibc binaries.
>
> Solaris uses SHT_SUNW_verneed sections for this, not a property note.
> Property notes seem the wrong approach for this.  And there is no reason
> to make this specific to glibc.
>
> However, I still very much dislike this proposal.
>
Can you share your concerns?

Thanks.

-- 
H.J.

* H. J. Lu:
> On Wed, Oct 27, 2021 at 11:52 PM Florian Weimer <fweimer at
redhat.com> wrote:
>>
>> * H. J. Lu via llvm-dev:
>>
>> > 1. Some binaries which require new ELF features, like DT_RELR,
only
>> > work with the new glibc binary.  They crash at run-time with the
older
>> > glibc binaries.
>> > 2. Somes binaries compiled with the new language features, like
C2X
>> > printf specifiers, only generate correct results with the new
glibc
>> > binary.  Since we don't add new glibc versions to the printf
function
>> > family, they generate incorrect results at run-time with the older
>> > glibc binaries.
>>
>> Solaris uses SHT_SUNW_verneed sections for this, not a property note.
>> Property notes seem the wrong approach for this.  And there is no
reason
>> to make this specific to glibc.
>>
>> However, I still very much dislike this proposal.
>>
>
> Can you share your concerns?
See the other thread (mostly on libc-alpha I think).

Florian