Add support for LLVM_USE_SANITIZER = SafeStack

[Kostya Serebryany via llvm-commits]

+folks who may be able to answer...
Next time, please use http://llvm.org/docs/Phabricator.html, at least for
for changes around -fsanitize=*

On Mon, Oct 5, 2015 at 2:20 AM, Valérian Rousset via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Hello all,
>
> Here is a trivial patch to allow LLVM to be build with SafeStack, via
> LLVM_USE_SANITIZER=SafeStack.
>
> It does compile without issue, but some tests fail, mainly due to
> profiling with
> instrumentation.
> It fails with `undefined reference to `__safestack_unsafe_stack_ptr'`
> because it
> has to link with the SafeStack runtime but it wasn't build. What is the
> best way
> to do this? Mark the tests as unsupported or did I missed something?
>
> Have a nice day.
> --
> tharvik
>
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