Adding MSVC 2017 to Qt

You cannot add MSVC manually to Qt Creator. You do need to have it auto-detected.

Also the mechanisms of detection changes depending on MSVC version and Qt Creator version. So be sure to use the latest version of Qt Creator (4.9.2 at this time) to make sure all your installed MSVC toolchain are detected.

Also given you comment you seem to confuse 64-bit and 32-bit.

x86 means 32-bit and amd64 means 64-bit.

This gives:

• x86 32-bit compiler that produces 32-bit exe
• x86_amd64 32-bit compiler that produces 64-bit exe
• amd64 64-bit compiler that produces 64-bit exe
• amd_x86 64-bit compiler that produces 32-bit exe

So if you wan to produce 32-bit programs, you can use x86 or amd64_x86. If you want to produce 64-bit programs, you can use amd64 or x86_amd64.

If at some point you want to compile a Qt porgam, but Qt Creator does not recognize your MSVC toolchain, you still have a solution:

1. Open Qt 5.12.4 (MSVC 2017 64-bit) from the start menu
2. In the prompt run C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat amd64
3. Run qmake and enjoy

You can't manually add MSVC to Qt Creator. If you want to use it make sure to have the correct Visual Studio version installed.

I suggest reinstalling Visual Studio if the MSVC compiler don't appear in the Compilers tab.