On 04/04/2019 17:46, Marcus Müller wrote:
On 4. Apr 2019, at 15:28, David Chisnall <[email protected]
<mailto:[email protected]>> 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?
Clang will only use the features of the newest version that it knows
about. In clang 7 and newer, there's now a macro so you can detect the
degree to which it's downgraded, but that won't be set with such an old
version of clang. It should support the 1.8 ABI though, which should be
good enough...
David
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