[cfe-dev] Sanitizer test failures when switching to libc++ by default

[Kostya Serebryany via cfe-dev]

On Fri, Feb 5, 2016 at 6:21 AM, Hahnfeld, Jonas via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi all,
>
> I'm currently looking into (optionally) switching the default C++ stdlib to
> libc++ (see http://reviews.llvm.org/D15920 which hasn't received a review
> so
> far)
> I've resolved all regression test failures in clang which are now passing
> cleanly.
>
> I'm now investigating the failing sanitizer tests in compiler-rt, here's
> what I got so far:
>  - two tests use -static-libstdc++ which obviously needs a
> -stdlib=libstdc++
> (asan/TestCases/throw_invoke_test.cc and tsan/static_init6.cc)
>

Makes sense.
I wonder if we can also use -static-libc++ for these tests


>  - tsan builds an instrumented version of libc++ and adds their headers.
> This leads to errors with default C headers which are #include_next'd in
> libc++. These #include_next then find the headers of the "normal" libc++
> which in turn instantly return because of the header guards. Therefore
> basic
> functions like printf aren't defined.
> Solution: Pass -nostdinc++ to disable the headers of the "normal" libc++
>

emm, probably.


>  - lsan completely fails with libc++, I had to generally pass
> -stdlib=libstdc++ - is this known and possibly still work in progress?
>

This is not known to me. What are the symptoms?


>
> Greetings,
> Jonas
>
> --
> Jonas Hahnfeld, MATSE-Auszubildender
>
> IT Center
> Group: High Performance Computing
> Division: Computational Science and Engineering
> RWTH Aachen University
> Seffenter Weg 23
> D 52074  Aachen (Germany)
> Hahnfeld at itc.rwth-aachen.de
> www.itc.rwth-aachen.de
>
>
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