C++ exceptions in freebsd-arm doesn't seem to work

[Warner Losh]

On Jun 7, 2014, at 10:07 AM, Adrian Chadd <adrian at FreeBSD.org> wrote:

>> Sadly, all I can do is confirm what you say:  C++ exceptions don't work
>> on ARM EABI, not with clang and not with gcc.  The only combo that works
>> is gcc and OABI, but with that combo you lose hardware floating point.
>> 
>> There are rumours that this may be fixed in clang 3.5, but we apparently
>> can't import 3.5 because it can't be bootstrapped using gcc 4.2.  I
>> haven't had time yet to learn how to build clang 3.5 out-of-tree to
>> confirm that exceptions work there.
>> 
> 
> If only we had a way to tell our build system to build the in-src-tree
> compiler suite using an external compiler toolchain. That'd make those
> problems go away.

We do. It isn’t perfect, and you’d have to bootstrap either a new gcc or a 3.4 clang first to do it though. The automation of the bootstrapping isn’t present, and is what I’m working on…

Of course, it doesn’t solve all the problems, just means we have more tools to deploy.

3.5 is also quite experimental as well.

But there’s been no real talk about the right path forward: just FUD and hand wringing on the lists. We do need to have a real discussion about this. Not the lame pot-shots that have happened to date: what versions do we support upgrading from, what configurations, etc. If we had that discussion, then we wouldn’t even need what Adrian suggests. We’d just say you have to have FreeBSD 9.2 or newer with clang 3.3 (or is it clang 3.4) to bootstrap, and if you want to use other tools, you are on your own. This would break updating from 8.x, but that’s likely OK. Be we need to have this discussion.

Warner

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