[PATCH v2] <shlib-compat.h>: Support compat_symbol_reference for _ISOMAC

[Florian Weimer]

* H. J. Lu:

> On Tue, Mar 2, 2021 at 1:02 PM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu:
>>
>> > On Tue, Mar 2, 2021 at 12:10 PM Florian Weimer via Libc-alpha
>> > <libc-alpha@sourceware.org> wrote:
>> >>
>> >> This is helpful for testing compat symbols in cases where _ISOMAC
>> >> is activated implicitly due to -DMODULE_NAME=testsuite and cannot
>> >> be disabled easily.
>> >>
>> >> ---
>> >> v2: Now actually tested in the situation where I need it.
>> >>
>> >
>> > Any particular tests which need this?
>>
>> nptl/tst-cleanup4aux.c will need this once _pthread_cleanup_push,
>> _pthread_cleanup_pop are compatibility symbols.

> Do you just want to link against the older version and nothing else?

It's the only version, but yes.

Thanks,
Florian