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Re: [PATCH] malloc: Use compat_symbol_reference in libmcheck [BZ #22050]
On Thu, 31 Aug 2017, Florian Weimer wrote:
> Interposition happens only if __malloc_initialize_hook is listed in the
> .dynsym section of the executable. At least some versions of binutils
> will not add the symbol to the .dynsym section if it is unversioned and
> there is a definition in a DSO which lacks a default version. Arguably
> this is a bug in the link editor.
Sounds like a feature to me, not a bug. After all, it's essentially what
makes it possible for us to obsolete (stop working for new programs as far
as possible) symbols whose interface is that the program interposes them,
such as matherr. Effectively, a DSO definition that lacks a default
version should be treated exactly the same at static link time as no DSO
definition at all.
--
Joseph S. Myers
joseph@codesourcery.com