Fix QSharedMemory on macOS with Qt 6.6+#215
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Qt 6.6+ defaults to POSIX Realtime shared memory via QNativeIpcKey on macOS. However, POSIX shared memory (shm_open) requires Qt to be built with -feature-ipc_posix and has strict naming requirements. Many Qt installations (including Homebrew) don't have POSIX IPC enabled, causing the error: QSharedMemory::KeyError "QSharedMemory::attach (shm_open): bad name" Use legacyNativeKey() to force System V shared memory, which works reliably on all macOS configurations regardless of Qt build options. Fixes single instance detection failing on macOS with Qt 6.6+.
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Qt 6.6+ defaults to POSIX Realtime shared memory via QNativeIpcKey on macOS. However, POSIX shared memory (shm_open) requires Qt to be built with -feature-ipc_posix and has strict naming requirements.
Many Qt installations (including Homebrew) don't have POSIX IPC enabled, causing the error:
QSharedMemory::KeyError "QSharedMemory::attach (shm_open): bad name"
Use legacyNativeKey() to force System V shared memory, which works reliably on all macOS configurations regardless of Qt build options.
Fixes single instance detection failing on macOS with Qt 6.6+.