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Mac build guide: install the Qt that CI uses - #1762
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Homebrew's Qt is a different version, and its macOS qtmultimedia is built with -DQT_FEATURE_ffmpeg=OFF, so Qt falls back to the AVFoundation audio backend. With it the audio tests fail (Qt 6.9 decodes the mp3 fixture to Int16) and the test run can crash in AVFoundation's reader thread. Install Qt 6.10.2 with qtmultimedia and qtserialport via aqtinstall, the same Qt as the Mac CI jobs (jurplel/install-qt-action), and point CMake at it with CMAKE_PREFIX_PATH. Explain that switching Qt needs a fresh build folder, since CMake caches the Qt it found. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Homebrew's Qt is a different version, and its macOS qtmultimedia is built with -DQT_FEATURE_ffmpeg=OFF, so Qt falls back to the AVFoundation audio backend. With it the audio tests fail (Qt 6.9 decodes the mp3 fixture to Int16) and the test run can crash in AVFoundation's reader thread.
Install Qt 6.10.2 with qtmultimedia and qtserialport via aqtinstall, the same Qt as the Mac CI jobs (jurplel/install-qt-action), and point CMake at it with CMAKE_PREFIX_PATH. Explain that switching Qt needs a fresh build folder, since CMake caches the Qt it found.