Re: PowerPC64 ELFv1 undefined weak functions

[Alan Modra <amodra at gmail dot com>]

On Thu, Aug 11, 2016 at 10:58:24AM +0100, Nick Clifton wrote:
> Hi Alan,
> 
> > Undefined weak functions, like __gmon_start__, were not being made
> > dynamic or emitting plt call code.  While the behaviour of undefined
> > weak symbols is not defined in the ELF standard, the intention on
> > powerpc64 was to make it possible to link without a definition of such
> > symbols and at run time behave the same as if a definition was found
> > at link time in a shared library.
> 
> Do you think that it would be worth creating a new test, probably in gcc, 
> to check that this behaviour does work as expected ?

Yes.  We could probably cobble together something to add to the ld
testsuite, possibly in ld-elfweak.  It wouldn't need to test
__gmon_start__.  A different undefined symbol not in reserved name
space would be better.

-- 
Alan Modra
Australia Development Lab, IBM