Re: "undefined reference to ’objc_msgSend’"

[Marcus Müller]

On 4. Apr 2019, at 15:28, David Chisnall <gnustep@theravensnest.org> wrote:

On 04/04/2019 13:52, Scott Little wrote:

→    -L/usr/lib/gcc/x86_64-linux-gnu/7/libobjc.so \

This looks very much as if you are linking the old GCC libobjc, which doesn't provide an objc_msgSend implementation.  If you wish to use this, then you must use -fobjc-runtime=gcc, not -fobjc-runtime=gnustep.

-fobjc-runtime=gnustep is not recommended without an explicit version (e.g. -fobjc-runtime=gnustep-2.0).

I usually select the runtime by defining `RUNTIME_VERSION`, i.e. `RUNTIME_VERSION=gnustep-2.0`. Scott wrote, however, that he's using clang-3.9. If I understood the previous conversation correctly, then you'd need at least clang-7.0 in order to use the 2.0 ABI, correct? What happens in this case? Will clang (somehow) downgrade the runtime features to the maximum version it supports?

Best,

  Marcus

--
Marcus Müller  .  .  .  http://www.mulle-kybernetik.com/znek/