Re: Linker error while trying to use arc

[David Chisnall]

On 01/05/2019 13:06, Ivan Vučica wrote:
> On Wed 1 May 2019 at 09:03, David Chisnall <gnustep@theravensnest.org 
> <mailto:gnustep@theravensnest.org>> wrote:
>
>     On 30/04/2019 18:12, Ivan Vučica wrote:
>      > I don't think you installed libobjc2. Its .so is called libobjc2.so*.
>
>     This is not true.  It is intended to be a drop-in replacement for the
>     old gcc runtime, so uses the same name for the binary.
>
>
> Oops. Apologies for handing out wrong advice. In my defense, there’s 
> nonzero amount of google results for “libobjc2.so” :)
>
> Given it’s (to my knowledge) not compatible with GCD runtime, and thus 
> not actually a drop in replacement, was that a good idea?

I presume GCD is a typo.  It is compatible with the GCC runtime, and 
(still, though not if you disable old ABI compat in CMake) able to work 
with code compiled with GCC.

I tried making the test suite build with gcc a little while ago, but it 
turns out that about 80% of the tests check functionality that GCC 
doesn't support, so I never committed it.  The tests that did compile 
with GCC still worked.

If GCD is not a typo and you mean libdispatch: libobjc2 imports the 
hooks that libdispatch exports for ARC memory management.

> I think incompatibility is why I always assumed it’s not named libobjc.so.

Most users of the first libobjc2 releases were using it with gcc.

David