Re: C++ conversion status update

Pedro Alves
2015-12-14T19:09:12Z

On 12/14/2015 02:40 PM, Yao Qi wrote:
> Pedro Alves <palves@redhat.com> writes:

> We need a wiki page to track these hosts on which we enabled C++ build.
> Like this gcc wiki page, https://gcc.gnu.org/wiki/CppBuildStatus or we
> can track them in existing https://sourceware.org/gdb/wiki/cxx-conversion
> wiki page.

Ok.

>
>> The plan I propose next is to default to building in C++ mode on hosts
>> that are known to build cleanly in C++ mode. Or rather, change the default
>> to be C++ mode, _except_ for hosts/ports that haven't been converted
>> yet.
>
> I prefer the latter.
>
>> Then, as ports get converted, one by one they'll be removed from
>> the "can't do C++ yet" list. That gives us a defined stopping point -- when
>> the list becomes empty, and after a reasonable period, we can decide to remove
>> support for building in C mode and start making use of C++ features.
>
> That sounds good to me.

Ok, that's my preference as well.

>
>>
>> The question I have is which hosts (Architecture + OS combination) people
>> care about that still need C++ conversion work and thus should be on
>> that list?
>
> How about all linux and mingw hosts? assuming that xtensa can be
> converted.

x86-64 and x86 mingw built cleanly last I tried.

I don't know about _all_ Linux hosts, hence the RFH.

At least x86, x86_64, Aarch64, ARM, and PPC64 build cleanly. Or did, a
few weeks back.

>>
>> This is where anyone can help!
>>
>> I've created the "users/palves/cxx-conversion" branch (on sourceware.org)
>> where I committed a patch that implements the list idea. I filled in
>> a set of hosts that I _thought_ wouldn't build, but I don't really know
>> for sure.
>>
>> So I'd like to invite people to try to build master on their favorite
>> host with --enable-build-with-cxx, and report back the result.
>
> We didn't hear anything on this yet, but we can't wait for it forever.

Yeah. I got enthusiastic support offlist for C++ in general, but people
don't seem to really be that interested or paying attention to random
host architectures.

Meanwhile, I tried a few BSD hosts on the compile farm and
wrote a few patches:

https://github.com/palves/gdb/commits/palves/cxx-conversion-netbsd

but haven't had a moment yet to drive them to completion. I probably should sync
up with Simon though, as I think I may be duplicating work he's done already.

Thanks,
Pedro Alves