[cfe-dev] [libcxxabi] Contributing ARM EHABI support for libcxxabi

Nico Weber thakis at chromium.org
Wed Dec 4 15:18:25 PST 2013

On Wed, Dec 4, 2013 at 2:44 PM, Nick Kledzik <kledzik at apple.com> wrote:

> On Dec 4, 2013, at 12:56 PM, Nico Weber <thakis at chromium.org> wrote:
>>> > 3.) r192136 didn’t add any test – how should testing of unwinding code
>>> work? Is running the exception tests in the libc++ suite enough?
>>> The Darwin libunwind project (
>>> http://opensource.apple.com/source/libunwind/libunwind-35.3/) on which
>>> this was based had some a small test suite, but it did not fit into the
>>> existing libcxxabi test suite which assumes target==host and every test is
>>> one .cpp file.
>> Ok. I tried running at least the libc++abi test suite to make sure we
>> don't completely break exception handling on darwin, but it looks like the
>> buildit script doesn't build libunwind, and if I try to get it to compile
>> (attached), the compiler complains about mach-o/dyld_priv.h – is it
>> currently possible to run libc++abi tests for the Unwind bits of libc++abi
>> on darwin?
> If I copy
> http://www.opensource.apple.com/source/dyld/dyld-132.13/include/mach-o/dyld_priv.h?txt
>  to include/mach-o/dyld_priv.h and build with the attached script, I'm
> able to build a libunwind.dylib that passes the tests and that fails them
> if I add an early return to _Unwind_RaiseException. Would adding
> dyld_priv.h and landing the attached patch be a good first step?
> Regarding dyld_priv.h, since it is always on my system in
> /usr/local/include, I had not realized the unwinder had that dependency.  I
> posted a patch earlier to get the unwinder building on older darwins which
> did not have dyld support.  I can update that patch so that the unwinder
> never need dyld_priv.h.

Oh, and this would be appreciated :-)

> Regarding the build system, I think it brings up the bigger issue of what
> sort of build system we want for libcxxabi.  The script is a quick way to
> get building.  But, it is not how Apple actual builds the shipping
> libunwind (which is a local xcode project).  What sort of build system
> would others like?
> -Nick
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