Details
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Bug
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Resolution: Unresolved
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P2: Important
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None
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5.12
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None
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Linux/Wayland
Description
moc generates invalid C++ code (invalid syntax) upon a complex situation involving macros, while trying to automate the creation of connections of signals to c++11 lambdas:
void LambdaConnector::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)\{ if (_c == QMetaObject::InvokeMetaMethod) { auto *_t = static_cast<LambdaConnector *>(_o); Q_UNUSED(_t) switch (_id) { case 0: _t->call((*reinterpret_cast< int int(*)>(_a[1])),(*reinterpret_cast< bool(*)>(_a[2]))); break; case 1: _t->call((*reinterpret_cast< QString(*)>(_a[1]))); break; case 2: _t->call(); break; default: ; } }}
It is reproducible by adding the attached file into a project and just compiling it. I have used for example: https://github.com/jasondegraw/Qt-CMake-HelloWorld.git and just added the header file into the CMake file and rebuilt the project. You will get the error like:
Qt-CMake-HelloWorld/build/helloworld_autogen/EWIEGA46WW/moc_LambdaConnector.cpp:75:55: error: two or more data types in declaration of ‘type name’ 75 | case 0: _t->call((*reinterpret_cast< int int(*)>(_a[1])),(*reinterpret_cast< bool(*)>(_a[2]))); break; | ^ make[2]: *** [CMakeFiles/helloworld.dir/build.make:89: CMakeFiles/helloworld.dir/helloworld_autogen/mocs_compilation.cpp.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:96: CMakeFiles/helloworld.dir/all] Error 2 make: *** [Makefile:103: all] Error 2
If you run the header file via the preprocessor the generated code is valid.