On Thu, Jun 06, 2013 at 12:55:17PM +0400, Konstantin Serebryany wrote:
> > ubsan actually needs
> > U _ZTIN10__cxxabiv117__class_type_infoE@@CXXABI_1.3
> > U _ZTIN10__cxxabiv120__si_class_type_infoE@@CXXABI_1.3
> > U _ZTIN10__cxxabiv121__vmi_class_type_infoE@@CXXABI_1.3
> > U _ZTISt9type_info@@GLIBCXX_3.4
> > U __dynamic_cast@@CXXABI_1.3
>
> These things are needed only for the C++-specific undefined behavior checking.
> At least, if I compile a C test using clang -fsanitize=undefined I
> don't see any of these.
But that is only because of the statically linking everything approach.
When libubsan is a shared library, when any part of the library needs
libstdc++, you need it for everything, unless you do some weakref tricks and
use it only conditionally (but that might be harder when you use C++
dynamic_cast, you'd need to call the runtime routine through weak symbol
instead by hand).
> > plus all the libs have:
> > w __cxa_demangle@@CXXABI_1.3
>
> This beast is declared as weak:
Sure, I know very well what w means ;), was listing this just for
completeness.
Jakub
