Re: Implementation of CFBridgingRelease() on GNUstep

[Daniel Ferreira (theiostream)]

On Fri, Jun 2, 2017 at 12:20 AM, Stefan Bidigaray <address@hidden> wrote:
> Are these two functions only supposed to work when ARC is available? Or can
> they be used with GCC/GNU-runtime and manual ref. counting? If they have to
> work with GCC and manual ref. count, I assume CFBridgingRelease would be a
> no-op when the object is a CF-type and a ref. decrement when it is a objc
> object. Does that sound about right?

These functions have "ARC" stamped in their description, however they
seem to work (i.e. not throw any sort of exception or crash) if they
are called outside an ARC context in my Mac, but I'm really not sure
what their behavior looks like in this case. Tomorrow I can try to
investigate if they affect the object's retain count and see if we get
some knowledge out of that.

Nevertheless, the calls to objc_retain()/objc_autoreleaseReturnValue()
will *only* happen in an ARC context, and since that's only the case
when we have the libobjc2 + Clang combination (correct me if I'm
wrong), we can wrap calls to these functions around a __has_feature()
macro and a GCC build wouldn't be affected by this implementation.
Then we can configure a test for this that also does the same
__has_feature() check and skips if we're not arc-able.

As for tests, I agree they are totally necessary, although I'm not
quite sure how to write them. I really appreciate suggestions.