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[Bug ld/26407] Global symbol reference breaks without -Bsymbolic-functio

From: hjl.tools at gmail dot com
Subject: [Bug ld/26407] Global symbol reference breaks without -Bsymbolic-functions
Date: Thu, 20 Aug 2020 11:53:51 +0000


H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
         Resolution|---                         |WONTFIX
             Status|WAITING                     |RESOLVED

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Fabian Vogt from comment #6)
> (In reply to H.J. Lu from comment #4)
> > '--dynamic-list=DYNAMIC-LIST-FILE'
> >      Specify the name of a dynamic list file to the linker.  This is
> >      typically used when creating shared libraries to specify a list of
> >      global symbols whose references shouldn't be bound to the
> >      definition within the shared library, or creating dynamically
> >      linked executables to specify a list of symbols which should be
> >      added to the symbol table in the executable.  This option is only
> >      meaningful on ELF platforms which support shared libraries.
> > 
> > So symbols aren't on the dynamic list will be bound to the definition
> > within the shared library.  The linker behavior matches the linker
> > manual.
> That doesn't explain the behaviour change with -Bsymbolic-functions and the
> different behaviour with gold.

Let focus on ld.  -Bsymbolic-functions changes behavior is a bug, which has
been fixed in 2.35.

> The definition of the symbol is inside lib.so, so there is no reason this
> shouldn't work.


> This breaks because the break binary has a R_X86_64_COPY relocation, which
> essentially moves the symbol out of the lib into the executable.
> IMO copy relocations are an implementation detail which should be made as
> compatible as possible, in this case maybe by making --dynamic-list-data the
> default if --dynamic-list is passed.

There is no different between value and setValue as far as --dynamic-list
is concerned.  Linker provides precise controls with command-line options.
You need to tell linker exactly what you need.

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