[llvm-dev] CMake Cache PGO error

[Kostya Serebryany via llvm-dev]

Same trouble here, and I haven't figured out how to fix it (other than by
removing llvm/projects/libcxx*).



On Thu, Mar 16, 2017 at 7:39 AM, Brian Cain via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> > -----Original Message-----
> > From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
> Vedant
> > Kumar via llvm-dev
> ...
> > Haven't given the PGO cache file a shot, but I ran into a similar
> problem today,
> > and solved the issue by making sure that my host compiler had access to a
> > working copy of the profiling runtime.
> >
> > For me, that's: ninja libclang_rt.profile_osx.a
> >
> > If that's not your issue, try checking the CMake{Error,Output}.log
> files, and
> > figure out why exactly the check is failing (most likely it has nothing
> to do with
> > the "c++11 unsupported" error message).
>
> When I build with ASan+sanitizer coverage I get the same error as Timo.
> For me, it's due to undefined references to pthread_*/dlsym/__dynamic_cast/typeinfo
> for __cxxabi, etc.  I'm using Ubuntu 14.04.
>
> I think I understand that the problem is somehow related to my host
> compiler but it's not clear to me how to address it.
>
> This bug hints at the fact that the underlying problem might be a need for
> a static libc++: https://bugs.llvm.org/show_bug.cgi?id=30919
>
> The dynamic_cast test case w/-static-libstdc++ fails for me:
> https://bugs.llvm.org/show_bug.cgi?id=30919#c3 but my build is after the
> fix (r 287373).   I haven't tried it with LIBCXX_ENABLE_STATIC_ABI_LIBRARY
> yet, I'll try that next.  I suppose that must be applied to my stage0/host
> compiler first before running my ASan build.
>
> -Brian
>
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