How to use older compiler with CMake Integration of Visual Studio 2019 - cmake

Question

I'm trying to compile gRPC on Windows into a DLL that is compatible with our C++ application that has to be compiled with the Visual Studio 2015 toolset.
Through the Visual Studio 2019 Installer I installed VS2019 together with the old C++ toolset (not IDE) of Visual Studio 2015.
When I open the freshly cloned gRPC source folder in VS2019 its CMake Integration creates the following CMakeSettings.json with default values:
{
// See https://go.microsoft.com//fwlink//?linkid=834763 for more information about this file.
"configurations": [
{
"name": "x64-Debug",
"generator": "Ninja",
"configurationType": "Debug",
"inheritEnvironments": [ "msvc_x64_x64" ],
"buildRoot": "${projectDir}\\out\\build\\${name}",
"installRoot": "${projectDir}\\out\\install\\${name}",
"cmakeCommandArgs": "",
"buildCommandArgs": "-v",
"ctestCommandArgs": ""
}
]
}
How can I specify in the CMakeSettings.json file the following -A and -T options that I could specify when using CMake on the command line or the CMake GUI?

Answer 1

I solved this with the help of user squarekittles:
The -T argument goes into cmakeCommandArgs.
The -A argument must not be specified or you get an error because it is specified twice. It will be set through either generator or inheritEnvironments (not sure which one).
generator has to be set to Visual Studio {installed IDE version}, not Ninja
Due to the generator change, buildCommandArgs must be changed from -v to /v:{desired verbosity level, see msbuild doc}
All of these settings can be changed from the UI. Example: