Define various symbols conditionally in shared libraries executables

[Alan Modra]

On Wed, Jun 06, 2018 at 06:30:17AM -0700, H.J. Lu wrote:
> Here is a different approach for x86, which includes more testcases
> for PR ld/23161.  Do they pass with your patch?

Yes, all the tests pass on x86_64-linux without your elfxx-x86.c
changes.  I've incorporated your extra tests into the patchset.

I'm going to leave it a day or two before committing in case anyone
spots a problem.  x86_64-linux gcc and glibc builds look OK using the
new linker.

-- 
Alan Modra
Australia Development Lab, IBM