Re: Trying to build GNUstep from git repo and clang-9 on Raspbian Buster (10.4)

[Johannes Brakensiek]

Thank you for your reply, David.

On 18 Jun 2020, at 10:46, David Chisnall wrote:

> > If you want to build libobjc2 on armhf you will have to use the older 
> > version 1.9 of libobjc (which does not require clang >= 8, but works 
> > with older versions of clang as well).

> The v2 and v1 ABIs do not use different assembly fast paths.

This is always a little bit confusing to me. Version 2.0 of libobjc2 
supports v2 and v1 ABI, ok. But compiling only worked using the version 
1.9 of libobjc2 (meaning the git tag/version, not the ABI version). Does 
that sound correct to you?

> > Also, it would be very nice if anybody would like to do the missing 
> > libobjc2 assembler implementation for armhf. I think this is a common 
> > use case as long as the default arch for Raspbian is 32 bit. Even 
> > though this arch will be running out of support at some time in the 
> > future, of course.
>
>
> I did.  Five years ago.  Note that there was a bug until 15 months ago 
> where the unwind info was not correctly set, so throwing an exception 
> out of +initialize would potentially corrupt some floating point 
> state.

That’s very good to read, thank you! Probably I read some outdated 
documentation or was just using the 1.9 tag because Raspbian only had 
clang 7 available then. I will try again with 2.0 and clang 8 and report 
if I ran into the same issue as Patrick.

Johannes