[Bug dynamic-link/28248] is there a way to LD_PRELOAD library before other dynamic libraries?

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28248

Florian Weimer <fweimer at redhat dot com> changed:

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                 CC|                            |fweimer at redhat dot com

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Milian Wolff from comment #2)
> I see, thank you!
> 
> Is there an alternative mechanism - potentially low-level / undocumented -
> that I could leverage to somehow inject my interposing library in such a
> way, that it's initialization happens after libc, but before any other
> libraries?

For glibc 2.34 on Linux, linking with -Wl,-z,initfirst should work. glibc
should no longer use DF_1_INITFIRST itself, so it's available for application
use.

> That way, I can call `__libc_freeres` safely, as no other library code run -
> except that of libc itself.

So this is about destructors? glibc currently does not guarantee that
destructors run in the opposite order of constructors (even without dlclose,
which can make some reordering necessary due to early unloading).

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