Build error in juce_CoreAudio_mac.cpp

General JUCE discussion
1

I tried building the AudioPluginHost today using JUCE 8.0.11 today and ran into a build error in juce_CoreAudio_mac.cpp like:

error: no type named 'value_type' in 'std::iterator_traits<juce::CoreAudioClasses::CoreAudioInternal::StrideIterator<const float *>>'

...

juce/modules/juce_audio_devices/native/juce_CoreAudio_mac.cpp:1125:18: note: in instantiation of function template specialization 'std::copy<juce::CoreAudioClasses::CoreAudioInternal::StrideIterator<const float *>, float *>' requested here
            std::copy (src, src + (ptrdiff_t) numSamplesInChunk, inStream->tempBuffers[(size_t) index]);

I could easyily silence that error by adding a specialization for std::iterator_traits to the end of the file like

 
namespace std 
{ 
    template <typename Iterator> 
    struct iterator_traits<juce::CoreAudioClasses::CoreAudioInternal::StrideIterator<Iterator>> : iterator_traits<Iterator> {}; 
} // namespace std

But that was mainly to be able to continue working, there might be better fixes.

I’m was building on macOS 14.7.4 via CMake using AppleClang 15.0.0.15000100.

2

I’m surprised our CI hasn’t caught that. What args are you passing to the compiler?

3

I’m building it with CLion, using the default generated debug profile with the -DJUCE_BUILD_EXAMPLES=ON -DJUCE_BUILD_EXTRAS=ON CMake options added.

This results in a configure command like this

/Applications/CLion.app/Contents/bin/cmake/mac/aarch64/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_MAKE_PROGRAM=/Applications/CLion.app/Contents/bin/ninja/mac/aarch64/ninja -DJUCE_BUILD_EXAMPLES=ON -DJUCE_BUILD_EXTRAS=ON -G Ninja -S /Users/me/Projects/juce -B /Users/me/Projects/juce/build/debug

and a build command like this

/Applications/CLion.app/Contents/bin/cmake/mac/aarch64/bin/cmake --build /Users/me/Projects/juce/build/debug --target AudioPluginHost -j 9

So, nothing too fancy I guess.

Happy to help with more information that might be required to reproduce the issue on your end.

4

Could you please share the compiler invocation for the file that’s failing to build?

I’m not seeing an error on the versions of macOS and Xcode I have easily accessible, but I’ve not reproduced your setup exactly.

5

FWIW I’ve seen people complain about this error occasionally on the TAP discord. I always assumed it was an issue with trying to build JUCE 8 on an older version of MacOS or Xcode.

6

I can also confirm this was an issue when compiling a project on a machine running macOS Ventura with Xcode 15.2 and SDK version 14.2.

7

It appears to be specific to Xcode 15.2.