[Bug dynamic-link/30186] RTLD_DEEPBIND interacts badly with LD_PRELOAD

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30186

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

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                 CC|                            |adhemerval.zanella at linaro dot o
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--- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
IMHO, the main issue is not clear how LD_PRELOAD should work with
RTLD_DEEPBIND: should LD_PRELOAD act as another DT_NEEDED library linked
against the binary (although with high priority as it was first in static
linking order) or should it be handled differently in the search namespace
(where RTLD_DEEPBIND always takes it in consideration).

As Florian has put on https://sourceware.org/bugzilla/show_bug.cgi?id=25533#c8
I don't think we can change LD_PRELOAD semantic without the potential breakage
on a lot of RTLD_DEEPBIND usages.

One possibility is to maybe another env. var to specify a different preload
mode or add another flag on dlopen; both which I am not really fond of. Florian
might have another idea.

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