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torsten 6513a267e2 Provides clear handoff infos for continuing migration work with resolution strategies

2026-09-06 18:58:10 +02:00

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DDS/RTI Migration - Continuation Prompt

Context

This prompt continues the Qt6 migration work for the Lts/DDS module with RTI Connext DDS 7.7 integration. The core DDS targets (ddscore, ddsftccore, ddsQoS, ddsconnector, ddsgen) have been successfully migrated and build with BUILD_RTI=ON.

Completed Work

See BUILD_RTI_VALIDATION_REPORT.md for detailed results of completed migration work.

Remaining Tasks

Priority 1: ddsfts Module

Location: Lts/DDS/FTS/

Blocker: Missing pdm.idl from ProjectDataManagement module

Required Actions:

Check if pdm.idl exists in legacy Qt5 version
If exists, copy to migrated version's IDL directory
Verify CMakeLists.txt references correct IDL path

If pdm.idl doesn't exist, create minimal stub for build purposes:

module ProjectDataManagement {
    // Stub IDL for build purposes
    struct ProjectData {
        string id;
    };
};

Rebuild ddsfts target
Verify no additional RTI header conflicts

Files to Check:

qt-migration-legatus/qt5-before/qt5-legatus-legacy/Lts/DDS/FTS/ (legacy)
qt-migration-legatus/qt6-after/qt6-migrated-legatus/Lts/DDS/FTS/ (migrated)
Lts/Plugins/ProjectDataManagement/ (source of pdm.idl)
Lts/Services/ProjectDataManagement/ (source of pdm.idl)

Priority 2: ProjectDataManagement Module Migration

Locations:

Lts/Plugins/ProjectDataManagement/
Lts/Services/ProjectDataManagement/

Migration Checklist:

Inventory all Qt5 API usage (QByteArray::number, deprecated signals/slots, etc.)
Update CMakeLists.txt for Qt6 (find_package(Qt6 COMPONENTS ...))
Verify KTextTemplate configuration for any IDL codegen
Check for AUTOMOC timing issues with generated files
Update include paths if necessary
Build with BUILD_RTI=ON to verify compatibility
Run any existing tests

Qt5 API Patterns to Search:

# In ProjectDataManagement directories
grep -r "QByteArray::number" --include="*.h" --include="*.cpp"
grep -r "QRegExp" --include="*.h" --include="*.cpp"
grep -r "QDesktopWidget" --include="*.h" --include="*.cpp"
grep -r "QApplication::desktop" --include="*.h" --include="*.cpp"

CMake Updates Needed:

# Qt5 pattern (legacy)
find_package(Qt5 REQUIRED COMPONENTS Core Widgets)

# Qt6 pattern (migrated)
find_package(Qt6 REQUIRED COMPONENTS Core Widgets)
qt_standardize_properties()

Priority 3: Project Plugin Qt6 Migration

Affected Plugins:

Lts/Plugins/ProjectEtsPlugin/
Lts/Plugins/ProjectAhtcPlugin/
Lts/Plugins/ProjectPluginBase/
Lts/Plugins/Project*Plugin/

Known Error: moc "Undefined interface"

Investigation Steps:

Check Q_PLUGIN_METADATA declarations
Verify interface classes have Q_DECLARE_INTERFACE
Check for missing Q_OBJECT macros
Verify AUTOMOC is enabled in CMakeLists.txt
Check for circular dependencies between plugins

Common Qt6 Migration Issues:

Q_PLUGIN_METADATA requires QJsonDocument in Qt6
Interface UUIDs must be consistent
Plugin loading may require Q_PLUGIN_IMPORT in addition to Q_PLUGIN_METADATA

Build Commands

Standard DDS Build (Working)

docker run --rm -it \
  -v /home/torsten/swy/sandbox:/workspace \
  -v /home/torsten/swy/sandbox/rti_license.dat:/workspace/rti_license.dat:ro \
  legatus-qt6-build:latest \
  bash -c "cd /workspace/qt-migration-legatus/qt6-after/qt6-migrated-legatus && \
           mkdir -p build && cd build && \
           cmake -DBUILD_RTI=ON -DCMAKE_CXX_STANDARD=17 .. && \
           make -j8 ddscore ddsftccore ddsQoS ddsconnector ddsgen"

Full DDS Build (Including ddsfts)

docker run --rm -it \
  -v /home/torsten/swy/sandbox:/workspace \
  -v /home/torsten/swy/sandbox/rti_license.dat:/workspace/rti_license.dat:ro \
  legatus-qt6-build:latest \
  bash -c "cd /workspace/qt-migration-legatus/qt6-after/qt6-migrated-legatus && \
           mkdir -p build && cd build && \
           cmake -DBUILD_RTI=ON -DCMAKE_CXX_STANDARD=17 .. && \
           make -j8 ddscore ddsftccore ddsQoS ddsconnector ddsgen ddsfts"

ProjectDataManagement Build (After Migration)

docker run --rm -it \
  -v /home/torsten/swy/sandbox:/workspace \
  -v /home/torsten/swy/sandbox/rti_license.dat:/workspace/rti_license.dat:ro \
  legatus-qt6-build:latest \
  bash -c "cd /workspace/qt-migration-legatus/qt6-after/qt6-migrated-legatus && \
           mkdir -p build && cd build && \
           cmake -DBUILD_RTI=ON -DCMAKE_CXX_STANDARD=17 .. && \
           make -j8 ProjectDataManagement"

Known Issues Reference

Issue: ddsfts Build Failure

Severity: High (blocks complete DDS module build)
Root Cause: Missing pdm.idl dependency
Workaround: Create stub pdm.idl or migrate ProjectDataManagement first
Files Involved: Lts/DDS/FTS/CMakeLists.txt, Lts/Plugins/ProjectDataManagement/

Issue: ProjectDataManagement Not Migrated

Severity: Medium (blocks ddsfts, affects Project plugins)
Root Cause: Not yet started in current migration wave
Workaround: None - requires full migration
Files Involved: Lts/Plugins/ProjectDataManagement/, Lts/Services/ProjectDataManagement/

Issue: Project Plugin moc Errors

Severity: Medium (affects plugin loading, not DDS core)
Root Cause: Qt6 plugin interface changes
Workaround: Build without plugins or fix Q_PLUGIN_METADATA declarations
Files Involved: Lts/Plugins/Project*Plugin/

Testing Guidelines

After ddsfts Build

Verify libddsfts.so is created
Check for undefined symbols: nm -D libddsfts.so | grep U
Test plugin loading if applicable

After ProjectDataManagement Migration

Build ddsfts and verify success
Run any ProjectDataManagement unit tests
Verify pdm.idl codegen produces expected headers
Test integration with DDS module

After Project Plugin Migration

Build all Project*Plugin targets
Verify plugins load at runtime
Test plugin interfaces with host application
Check for moc warnings in build output

Success Criteria

ddsfts Module

ddsfts target builds without errors
libddsfts.so is created
No undefined symbol errors
pdm.idl codegen runs successfully

ProjectDataManagement Module

All Qt5 API usage replaced with Qt6 equivalents
CMakeLists.txt uses Qt6 find_package
Module builds with BUILD_RTI=ON
No moc warnings or errors
pdm.idl generates expected headers

Project Plugins

All Project*Plugin targets build
No "Undefined interface" moc errors
Plugins load successfully at runtime
Plugin interfaces work correctly

Notes

RTI 7.7 requires C++17 (not C++23)
Empty rti_license.dat is valid for development
Code generation must happen during build (no pre-generated files)
AUTOMOC timing issues require SKIP_AUTOMOC + manual QT6_WRAP_CPP for generated files
RTI headers conflict with stub definitions - use #ifdef BUILD_RTI guards

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