[PATCH BZ#20422] Do not allow asan/msan/tsan and fortify at the same time.

[Florian Weimer]

* Jakub Jelinek:

> Because you really don't know what kind of information will each tool want
> to know, and that can significantly differ between valgrind, [amt]san etc.
> In sanitizer_common, you can come up with some macros that will serve the
> needs of all the tools, and have each tool use those macros, other than
> that, it is a trivial 3 liner wrapper for each fortification function.

Uh-oh, would you subject matter experts please come up with a
consistent opinion what is *actually* needed?

Further up thread, in
<CAJOtW+7xjtx=DxEOSnaPfpU708RdUJYLRX8prv0bFW=x47+tmA@mail.gmail.com>,
Yuri Gribov said that the sanitizers will work fine despite the
additional indirection.

If this is not actually true, then of course it does not make sense to
maintain the unfortify bits in glibc.