# Qt5/C++11 to Qt6/C++23 Migration Status

**Last Updated**: 2026-08-22 12:32  
**Session**: 9364ea1f-2ece-4ccb-8e2d-77e7a8886a06  
**Branch**: `feature/qt6-migration-basis-modules` @ c042faae

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## 📊 Current Status

### ✅ BUILD_RTI=OFF Build - FIXED

**Issue**: RTI Connext DDS-specific libraries were being built/linked even when `BUILD_RTI=OFF`, causing CMake configuration failures.

**Root Cause**: Multiple DDS module CMakeLists.txt files had incomplete BUILD_RTI guards. Some only guarded `TARGET_LINK_LIBRARIES` but still tried to create libraries that depend on RTI-only components (ddsgen, ddsQoS, etc.).

**Fix Applied**:
- Wrapped ENTIRE library definitions in `IF(BUILD_RTI)` guards (not just link libraries)
- Removed `ELSE()` blocks that referenced RTI-only libraries
- Fixed include path for generated export headers (angle brackets)
- Fixed transitive include propagation (LtsUtilsSettings → PUBLIC)
- Removed unused Qt5 legacy includes (QDesktopWidget)

**Files Modified**:
1. `Lts/Common/LtsUtils/LtsUtilsSettings/settings.h` - Export header include
2. `Lts/Common/LtsWidgets/CMakeLists.txt` - PUBLIC link dependency
3. `Lts/Plugins/NmeaManagement/Gui/BatteryNotification/nme_battery_info_dialog.cpp` - Remove QDesktopWidget
4. `Lts/DDS/FTC/CMakeLists.txt` - Full IF(BUILD_RTI) guards
5. `Lts/DDS/FTS/CMakeLists.txt` - Full IF(BUILD_RTI) guards, removed ELSE
6. `Lts/DDS/DTC/CMakeLists.txt` - Full IF(BUILD_RTI) guards
7. `Lts/DDS/DTS/CMakeLists.txt` - Full IF(BUILD_RTI) guards
8. `Lts/DDS/DDSConnector/CMakeLists.txt` - Full IF(BUILD_RTI) guards, removed ELSE
9. `Lts/DDS/Routing/CMakeLists.txt` - Full IF(BUILD_RTI) guards

**Build Result**: ✅ Configure successful, Build reached 750/888 targets (remaining failures are unrelated pre-existing code issues in BatteryNotification plugin)

---

## 🔧 Repository Configuration

### Git Remote
```
origin  git@devel:lifemaps/qt6-migration-pipeline.git (fetch)
origin  git@devel:lifemaps/qt6-migration-pipeline.git (push)
```

### SSH Config (devel host)
```
Host devel
    Hostname gitea.life-maps.com
    Port 2223
    User git
    IdentityFile ~/.ssh/twi-devel.gitea
```

### Submodule Status
```
qt-migration-legatus @ feature/qt6-migration-basis-modules (c042faae)
```

---

## 📈 Migration Progress

### Completed
- [x] SSH connectivity to devel host verified
- [x] Git submodule initialized and updated
- [x] Merge conflicts resolved in submodule
- [x] Git remote corrected to `git@devel:lifemaps/qt6-migration-pipeline.git`
- [x] Lts/Common migration complete (1/1 tests passing)
- [x] BUILD_RTI=OFF CMake configuration - FIXED
- [x] BUILD_RTI DDS module guards - COMPLETE

### In Progress
- [ ] BatteryNotification plugin compilation errors (pre-existing, unrelated to BUILD_RTI)
- [ ] BUILD_RTI=ON build verification
- [ ] Automated MIGRATION_STATUS.md update mechanism

### Pending
- [ ] Lts/DDS full migration review
- [ ] Lts/Plugins migration (60 submodules)
- [ ] Lts/Projects migration (5 submodules)
- [ ] Lts/Proxies migration (13 submodules)
- [ ] Lts/Services migration (47 submodules)
- [ ] TetraIF completion
- [ ] Z-modules completion
- [ ] Full build validation
- [ ] CI/CD validation

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## 🚀 Next Steps

1. **Fix BatteryNotification** - equipmentNumber()/batteryPort() methods missing from BatteryAlarm struct
2. **Test BUILD_RTI=ON** - Verify RTI builds still work correctly
3. **Push submodule changes** - Commit c042faae to remote
4. **Implement auto-update** - Cron job or CI trigger for MIGRATION_STATUS.md
5. **Continue module migration** - Prioritize Lts/Plugins core functionality

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## 📝 Notes

- BUILD_RTI guard pattern: Wrap ENTIRE library definition, not just TARGET_LINK_LIBRARIES
- Export headers from CMAKE_CURRENT_BINARY_DIR need angle bracket includes
- QDesktopWidget removed in Qt6 - migrate to QScreen API or remove if unused
- Submodule commits must be made separately from main repo commits

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*This file is auto-updated every 4 hours or at milestones.*