Switched from Qt 5 to Qt 6

Mourad2024

"Hello everyone,
I am coding in C++/Qt, and I just switched from Qt 5 to Qt 6. Besides the numerous errors I've already fixed, there is one error that I don't understand, and it's the following:"

1 - C:\Qt\Tools\mingw1310_64\x86_64-w64-mingw32\include\objidlbase.h:2026: erreur : 'byte' has not been declared
In file included from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/combaseapi.h:155,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/objbase.h:14,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/ole2.h:17,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/wtypes.h:13,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/winscard.h:10,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/windows.h:97,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/winsock2.h:23,
                 from C:/Data/Fichiers_applications/C++/LibrairiesExternes/curl-8.8.0_1-win64-mingw/include/curl/curl.h:73,
                 from ..\..\Facturation\../Gestion/libcurlmodifiee.h:7,
                 from ..\..\Facturation\fen_de_facturation.h:51,
                 from ..\..\Facturation\fen_de_facturation.cpp:1:
C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/objidlbase.h:2026:5: error: 'byte' has not been declared
 2026 |     byte *pv,
      
2 - C:\Qt\Tools\mingw1310_64\x86_64-w64-mingw32\include\objidlbase.h:2026: erreur : reference to 'byte' is ambiguous
In file included from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/combaseapi.h:155,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/objbase.h:14,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/ole2.h:17,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/wtypes.h:13,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/winscard.h:10,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/windows.h:97,
                 from C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/winsock2.h:23,
                 from C:/Data/Fichiers_applications/C++/LibrairiesExternes/curl-8.8.0_1-win64-mingw/include/curl/curl.h:73,
                 from ..\..\Facturation\../Gestion/libcurlmodifiee.h:7,
                 from ..\..\Facturation\fen_de_facturation.h:51,
                 from ..\..\Facturation\fen_de_facturation.cpp:1:
C:/Qt/Tools/mingw1310_64/x86_64-w64-mingw32/include/objidlbase.h:2026:5: error: reference to 'byte' is ambiguous
 2026 |     byte *pv,

if anyone can help me please.
Thanks in advance to all.

Axel Spoerl

That's probably due to a change in the C++ version.
Check your headers for using namespace std and remove it.

J.Hilk

To add on to @Axel-Spoerl

std::byte is a thing since c++17

I think Qt6 requires c++17 now by default ? Anyway in your own code you have somewhere a byte type and the compiler is now confusing those too

Pro tipp namespaces are a thing use them :p

I had the same issue where I had a byte(order) enum type that caused all kind of problems, changed it to a capital B and that solved it.

Mourad2024

Hello,

Thank you 'Hilk' for your response. I will test that this weekend and will keep you updated.