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Re: [PATCH] malloc: Use compat_symbol_reference in libmcheck [BZ #22050]
On 08/31/2017 06:02 PM, Joseph Myers wrote:
> 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.
But that's not what happens if you compile with --export-dynamic. That
--export-dynamic changes behavior here is very surprising. That's why I
think this could be considered a bug in the link editor.