[cfe-dev] libc++abi on linux

[Richard Smith]

On Sun, Jul 8, 2012 at 10:52 PM, soaliap <soaliap at 126.com> wrote:

>
> "C. Bergström"-3 wrote
> >
> > libcxxrt + libunwind is the way to go imho
> > https://github.com/pathscale/libcxxrt
> > https://github.com/pathscale/libunwind
> >
> > These have been tested to work with clang - Admittedly the build process
> > may not be straight forward, but if enough interest maybe we solve that
> >
>
> Does this mean that if I want to build libcxxabi with clang++ or other
> compiler on linux, I must build libcxxrt and libunwind first? I have tried
> simply copying a file unwind.h from ${libunwind-path}/include to
> ${libcxxabi-path}/include, and it can compile success. But I'm not sure
> whether that works right.


I believe that should be fine; all unwind.h implementations should be
essentially equivalent. The problem which libc++abi + Clang faces seems to
be that the unwind.h provided by Clang is simply missing a bunch of the
declarations that libc++abi expects it to contain. It tries to
#include_next some other unwind.h to solve that problem, but that doesn't
work so well if there's no system unwind.h and libunwind isn't installed. I
don't know if there's a good reason why Clang's header is missing
things which libc++abi uses, like _Unwind_Exception.
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