[RFC][PATCH v2 0/6] binutils patches to add DT_GNU_UNIQUE

[Fangrui Song]

On 2020-06-17, H.J. Lu via Binutils wrote:
>On Wed, Jun 17, 2020 at 7:08 AM Vivek Das Mohapatra via Binutils
><binutils@sourceware.org> wrote:
>>
>> This patch series is in support of the glibc RTLD_SHARED work
>> discussed in https://sourceware.org/bugzilla/show_bug.cgi?id=22745.
>>
>> It adds a DT_GNU_UNIQUE dynamic section which is intended to mark
>> libraries which should implicitly be opened as if RTLD_SHARED
>> had been passed to dlmopen when the target namespace is not
>> LM_ID_BASE.
>>
>> This patch series adds support for DT_GNU_UNIQUE to ld, gold, and
>> readelf (and documents it in the help text and so forth).
>>

Does DT_GNU_UNIQUE perform anything not done by DF_1_NODELETE (-z nodelete)?

ld.so implementations supporting STB_GNU_UNIQUE semantics (afaik, glibc
is the only one) implicitly sets DF_1_NODELETE.

>Please send an email to
>
>https://sourceware.org/mailman/listinfo/gnu-gabi
>
>and create a merger request to document DT_GNU_UNIQUE at
>
>https://gitlab.com/x86-psABIs/Linux-ABI
>
>Thanks.