Details
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Bug
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Resolution: Out of scope
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Not Evaluated
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None
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5.12.0
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None
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windows10 + visual studio 2015 + Qt5.12.0 Debug Mode
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Windows
Description
I got an error msg when trying the plugins module --"Unexpected metadata contents". And I followed into the source codes and found the jsonFromCborMetaData() function. It shows that there is no valid meta data in the .dll file. So I searched the *.dll file for "*QTMEATADATA!" and got the following contents.
51 54 4d 45 54 41 44 41 54 41 20 21 20 05 0c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
It seems that Qt plugin module finds "QTMEATADATA!" but can't parse the following contents.
More, I manully modified the moc_XXX.cpp file, by replacing qPluginArchRequirements() with 1, and compiled again, the error disappeared.
QT_PLUGIN_METADATA_SECTION static constexpr unsigned char qt_pluginMetaData[] = { 'Q', 'T', 'M', 'E', 'T', 'A', 'D', 'A', 'T', 'A', ' ', '!', // metadata version, Qt version, architectural requirements 0, QT_VERSION_MAJOR, QT_VERSION_MINOR, 1/*qPluginArchRequirements()*/, 0xbf, // "IID" 0x02, 0x68, 'H', 'e', 'l', 'l', 'o', 'C', 'T', 'K', // "className" 0x03, 0x6e, 'H', 'e', 'l', 'l', 'o', 'A', 'c', 't', 'i', 'v', 'a', 't', 'o', 'r', 0xff, }; QT_MOC_EXPORT_PLUGIN(HelloActivator, HelloActivator)
I searched the *.dll file again and here is the resust
51 54 4d 45 54 41 44 41 54 41 20 21 20 05 0c 01 bf 02 68 48 65 6c 6c 6f 43 54 4b 03 6e 48 65 6c 6c 6f 41 63 74 69 76 61 74 6f 72 ff 00 00 00 00
The release mode is OK.
It seems that qt_pluginMetaData is not stored as a static array under debug mode due to the function call. Which will cause the fatal parsing when using *.dll.