Xcode 16.3 - JUCE 8.0.7 - warning cast-function-type-mismatch

MacOSX and iOS
1

Hello,
I updated to Xcode 16.3 and JUCE generates 95 warnings due to “-Wcast-function-type-mismatch”.
For example:

JUCE/modules/juce_core/native/juce_ObjCHelpers_mac.h:349:73: warning: cast from 'NSApplicationTerminateReply (*)(id, SEL, NSApplication *)' to 'IMP' (aka 'id  _Nullable (*)(id _Nonnull, SEL _Nonnull, ...)') converts to incompatible function type [-Wcast-function-type-mismatch]
  349 |         [[maybe_unused]] const auto b = class_addMethod (cls, selector, (IMP) callbackFn, s.data());
2

We’ve added some fixes for Xcode 16.3 warnings to the develop branch. Could you please see if they’re already addressed?

3

Yes, it’s still present on the branch develop (3924429)

4

Is this appearing in any of the projects included with JUCE, like the DemoRunner? If so, what steps are you taking to build?

5

I’m sorry, this seems to be linked to compiling for x86_64 (at least on my Silicon machine) and using the -Wextra flag. Here is how to reproduce it:
cmake -Bbuild -G Xcode -DJUCE_BUILD_EXTRAS=ON -DJUCE_BUILD_EXAMPLES=ON -DCMAKE_XCODE_GENERATE_SCHEME=ON -DCMAKE_OSX_ARCHITECTURES="\$(ARCHS_STANDARD)" -DCMAKE_CXX_FLAGS="-Wall -Wextra"
Then compile the AudioPluginHost for instance.

6

P.S. I created a PR in case you want to fix this issues, otherwise feel free to close it.

7

Thanks, that’s fixed here:

1 Like
Compiler error with Xcode 16.3 and JUCE 8.0.7