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qt-migration-legatus/qt6-after/qt6-migrated-legatus/DDS_RTI_MIGRATION_CONTINUATION_PROMPT.md
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torsten 283e89e3c9 Blocker: idl files mixture 
Only idl files from build folders have to into build process
2026-09-07 18:22:07 +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.

Current Blocker: ddsfts module blocked by IDL duplicate symbol definitions in ProjectDataManagement module.

Current Status (Updated)

✅ Completed

  • Docker build environment configured (Ubuntu 26.04, Qt 6.10.2, RTI 7.7.0)
  • KF6TextTemplate dependency installed (replaces Grantlee5)
  • Qt6 linguist tool stubs created (lconvert, lprodump, lpregen)
  • Missing test stub files created (coordTransTests_*.cpp)
  • DDS core targets build successfully:
    • ddscore
    • ddsftccore
    • ddsQoS
    • ddsconnector
    • ddsgen (IDL generator)

❌ Blocked

  • ddsfts: Blocked by ProjectDataManagement IDL conflicts (duplicate symbols)
  • ProjectDataManagement module: Not yet migrated to Qt6

📋 Reports Generated

  • DDS_RTI_MIGRATION_REPORT.md - Full migration status report
  • DDS_RTI_MIGRATION_CONTINUATION_PROMPT.md - This file (being updated)

Remaining Tasks

Priority 1: ddsfts Module - IDL Duplicate Symbol Resolution (CRITICAL)

Location: Lts/DDS/FTS/ and Lts/Services/ProjectDataManagement/

Blocker: IDL duplicate symbol definitions between pdm.idl and pdm_enums.idl

Error Message:

ERROR: pdm.idl line 46 duplicate symbol 'ProjectDataManagement::BiteComponentText' 
       was previously defined in file pdm_enums.idl line 447
ERROR: pdm.idl line 46 duplicate symbol 'ProjectDataManagement::BiteComponentText' 
       has enumerator 'FirePurpose' which collides with enumerator in 
       'ProjectDataManagement::BiteComponentText' from file pdm_enums.idl line 447

Affected Enumerators:

  • BiteComponentText (duplicate type definition)
  • FirePurpose (enumerator collision)
  • GearClass (enumerator collision)
  • EventType (enumerator collision)
  • Multiple other enum values

Required Actions:

  1. Audit IDL files for duplicates:

    cd Lts/Services/ProjectDataManagement
grep -n "BiteComponentText" pdm.idl pdm_enums.idl
grep -n "enum.*FirePurpose" pdm.idl pdm_enums.idl
grep -n "enum.*GearClass" pdm.idl pdm_enums.idl
grep -n "enum.*EventType" pdm.idl pdm_enums.idl

  2. Resolve duplicates:

    • Remove duplicate type/enum definitions from pdm.idl
    • Keep canonical definitions in pdm_enums.idl
    • Add #include "pdm_enums.idl" to pdm.idl if needed
    • Ensure all modules reference canonical definitions

  3. Verify IDL compilation:

    cd build4
make svcPdmCommon_autogen_timestamp_deps

  4. Rebuild ddsfts:

    make -j8 ddsfts

Files to Fix:

  • Lts/Services/ProjectDataManagement/pdm.idl
  • Lts/Services/ProjectDataManagement/pdm_enums.idl
  • Lts/Plugins/ProjectDataManagement/ (dependent module)

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:

  1. Check Q_PLUGIN_METADATA declarations
  2. Verify interface classes have Q_DECLARE_INTERFACE
  3. Check for missing Q_OBJECT macros
  4. Verify AUTOMOC is enabled in CMakeLists.txt
  5. 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 - After IDL Fix)

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"

IDL Investigation Commands (Host)

cd /home/torsten/swy/sandbox/qt-migration-legatus/qt6-after/qt6-migrated-legatus/Lts/Services/ProjectDataManagement

# Find duplicate definitions
grep -n "BiteComponentText" pdm.idl pdm_enums.idl
grep -n "enum.*FirePurpose" pdm.idl pdm_enums.idl
grep -n "enum.*GearClass" pdm.idl pdm_enums.idl
grep -n "enum.*EventType" pdm.idl pdm_enums.idl

# Check include relationships
grep -n "#include" pdm.idl
grep -n "#include" pdm_enums.idl

# View specific lines
sed -n '40,50p' pdm.idl
sed -n '440,455p' pdm_enums.idl

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 - IDL Duplicate Symbols (CRITICAL)

  • Severity: Critical (blocks complete DDS module build)
  • Root Cause: Duplicate type/enum definitions in pdm.idl and pdm_enums.idl
  • Error: duplicate symbol 'ProjectDataManagement::BiteComponentText'
  • Workaround: Remove duplicates from pdm.idl, keep canonical in pdm_enums.idl
  • Files Involved:
    • Lts/Services/ProjectDataManagement/pdm.idl
    • Lts/Services/ProjectDataManagement/pdm_enums.idl
  • Status: Requires manual IDL cleanup

Issue: ProjectDataManagement Not Migrated

  • Severity: High (blocks ddsfts, affects Project plugins)
  • Root Cause: Not yet started in current migration wave
  • Workaround: None - requires full Qt6 migration
  • Files Involved: Lts/Plugins/ProjectDataManagement/, Lts/Services/ProjectDataManagement/
  • Status: Pending migration

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/
  • Status: Pending investigation

Testing Guidelines

After ddsfts Build

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

After ProjectDataManagement Migration

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

After Project Plugin Migration

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

Success Criteria

ddsfts Module

  • IDL duplicate symbols resolved in pdm.idl/pdm_enums.idl
  • 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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