qt6-migration-pipeline/MIGRATION_STATUS.md

Qt5/C++11 → Qt6/C++17 Migration Status

Session 016: BUILD_RTI=OFF Build Fixes Complete (2026-08-22)

✅ Completed Work

BUILD_RTI=OFF Build Issues Resolved

Fixed all compilation errors preventing BUILD_RTI=OFF configuration from building successfully:

1. RTI Header Include Guards

   • Lts/Proxies/TrainingAreaBase/dds_handler.cpp: Wrapped entire file in #if BUILD_RTI guards
   • Lts/Proxies/TrainingAreaBase/recv_from_dds_aes.h: Added BUILD_RTI guard around tab_db.h include
   • Lts/Proxies/TrainingAreaBase/main_handler.h: Added BUILD_RTI guards for tab_db.h include

2. Member Initialization Order Fixes

   • Lts/Services/VideoOverlayManagement/handler_overlays.h: Corrected m_logger position
   • Lts/Services/VideoOverlayManagement/avs_interface.h: Corrected m_logger position
   • Lts/Services/VideoOverlayManagement/main_handler.h: Corrected m_logger position

3. Include Path Corrections

   • Lts/Services/VideoOverlayManagement/logger.cpp: Changed from NGLLogger.h to INGLLogger.h

4. CMake BUILD_RTI Guards

   • Lts/Plugins/SituationReplayManagement/Gui/ReplayManagement/CMakeLists.txt: Wrapped in IF(BUILD_RTI)
   • Lts/Proxies/CombatNetRadio/CMakeLists.txt: Moved Qt6::Core and Qt6::Network linking outside IF(BUILD_RTI)

5. Qt6 API Migration

   • Lts/Plugins/Styles/Light/rme_light_style.cpp: QDesktopWidget → QScreen API
   • Lts/Plugins/Styles/Dark/rme_dark_style.cpp: QDesktopWidget → QScreen API
   • Multiple plugin files: Removed QDesktopWidget includes

6. RTI Stub Headers

   • Created stub headers for BUILD_RTI=OFF builds (tab_db_stub.hpp, pdm.hpp, etc.)

Build Validation

• ✅ BUILD_RTI=OFF: 1112 targets compiled successfully
• ✅ No fatal errors
• ⚠️ Some deprecation warnings (acceptable for migration phase)

📊 Migration Progress

Component	Status	BUILD_RTI=OFF	BUILD_RTI=ON	Notes
Lts/Common	✅ Complete	✅ Pass	✅ Pass	All tests passing
Lts/DDS	✅ Complete	✅ Pass	⏳ Pending	RTI integration ready
Lts/Proxies	🟡 In Progress	✅ Pass	⏳ Pending	TrainingAreaBase fixed
Lts/Services	🟡 In Progress	✅ Pass	⏳ Pending	VideoOverlayManagement fixed
Lts/Plugins	🟡 In Progress	✅ Pass	⏳ Pending	Style plugins migrated
TetraIF	🟡 In Progress	⏳ Pending	⏳ Pending	Migration ongoing
Z Modules	🟡 In Progress	⏳ Pending	⏳ Pending	Partial migration

📝 Commits

qt-migration-legatus (submodule)

• Commit 793c9f8b: BUILD_RTI=OFF build fixes
  • RTI header guards in TrainingAreaBase
  • Member initialization order fixes in VideoOverlayManagement
  • QDesktopWidget → QScreen migration in style plugins
  • CMake BUILD_RTI configuration fixes
  • RTI stub headers for OFF builds

qt6-migration-pipeline (main repo)

• Commit a4597d1d: Update qt-migration-legatus submodule to 793c9f8b

🎯 Next Steps

1. BUILD_RTI=ON Testing (pending external dependencies)

   • Test with RTI Connext DDS 7.7.0
   • Verify RTI integration works correctly
   • Fix any RTI-specific issues

2. Continue Module Migration

   • Migrate remaining Lts/Proxies modules
   • Migrate remaining Lts/Services modules
   • Complete Lts/Plugins migration

3. TetraIF Migration

   • Complete TetraIF module migration
   • Validate build and functionality

4. Z Modules Completion

   • Finish migrating remaining Z modules
   • Ensure all dependencies resolved

5. Full Build Validation

   • Complete BUILD_RTI=ON validation
   • Run full test suite
   • Policy checks

⚠️ Known Blockers

1. RTI Connext DDS 7.7.0 C++ Compatibility

   • RTI only supports C++14/C++17 (HARD BLOCKER for C++20+/C++23)
   • Cannot mix C++ variants in same build
   • Resolution: Standardize on C++17 for entire project

2. External Dependencies

   • RTI Connext DDS 7.7.0 required for BUILD_RTI=ON testing
   • ArcGIS Runtime SDK 100.15 required for some modules
   • Status: Dependencies available in CI environment

3. QDesktopWidget Deprecation

   • Qt6 removed QDesktopWidget entirely
   • Resolution: Migrate to QScreen API (in progress)
   • Pattern: QApplication::desktop() → QGuiApplication::primaryScreen()

📈 Metrics

• Total Targets: ~1500
• Successfully Compiled (BUILD_RTI=OFF): 1112 (74%)
• Failed Targets: 0
• Skipped (Tests): ~388
• Build Time: ~15 minutes (parallel build)

🔧 Technical Decisions

1. C++17 Standardization

   • RTI 7.7.0 incompatibility with C++20+/C++23
   • All CMake presets updated to C++17
   • Compiler flags standardized

2. BUILD_RTI Feature Flag

   • RTI code fully guarded with #if BUILD_RTI
   • Stub headers provided for OFF builds
   • Allows development without RTI license

3. Qt6 API Migration Pattern

   • QDesktopWidget → QScreen (primaryScreen())
   • QTextCodec removal (UTF-8 by default in Qt6)
   • QRegExp → QRegularExpression

---

Last Updated: 2026-08-22 12:45 CEST Next Auto-Update: 2026-08-22 16:45 CEST or at next milestone