Helpful msg "...requires a C++17...On MSVC, pass the /Zc:__cplusplus" but no clue HOW to do that

BillyS

the error message from qglobal.h was "Qt requires a C++17 compiler, and a suitable value for __cplusplus. On MSVC, you must pass the /Zc:__cplusplus option to the compiler."

So, do these settings go into the Cmakelist file, or a header, or do i make default settings in microsoft visual studio, or what? I'm happy to comply. JUST TELL ME HOW. Thanks.

SGaist

Hi,

Which version of Visual Studio are you using ?
With which version of Qt ?

SamiV123

set(CMAKE_CXX_STANDARD 17)

BillyS

@SGaist I HAVE Visual Studio 2022 and 2019. 22 is Enterprise; 19 Pro and Community.
Qt6.7 .

BillyS

@SamiV123 Thank you. I believe this is just what i needed.

Sprezzatura

I'm using Qt 6, MSVC 2022, qmake. I had to add this to the .PRO file:

QMAKE_CFLAGS += -std:c++17
QMAKE_CFLAGS += -Zc:__cplusplus