How to get rid of or change the cmake default compiler flags

Question

I'm working on a windows machine with git bash as my terminal. I have converted a Visual studio *.sln file to CMake with the tool cmake-converter.exe. It produces several CMakeLists.txt in different directories. I want to use MSVC as my compiler but I'm building for an embedded x86 system.

I have pointed out the MSVC compiler in a separate toolchain file like this

set(CMAKE_C_COMPILER cl.exe)
set(CMAKE_CXX_COMPILER cl.exe)

When printing I have used Ninja as generator like this.

$ cmake --toolchain=./msvc_toolchain.cmake -S . -B build -G "Ninja"

When I look in the generated build.ninja I can see in FLAGS a -MDd that I don't have set in any cmake file. It looks strange with -MDd and I guess it should be /MDd. I also want to change it to /MT.

Does anybody know where this flag come from? Are they possible to change and how?

Here is my configuration output when I build.

$ cmake --toolchain=./msvc_toolchain.cmake -S . -B build -G "Ninja" -- The C compiler identification is MSVC 19.38.33141.0 -- The CXX compiler identification is MSVC 19.38.33141.0 -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.38.33130/bin/Hostx86/x86/cl.exe - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done

Hello Tsyvarev. Here are the files you asked about.

file CMakeLists.txt

cmake_minimum_required(VERSION 3.16.0 FATAL_ERROR)
set(CMAKE_SYSTEM_VERSION 10.0 CACHE STRING "" FORCE)
project(Ninja_proj C CXX)
set(PROJECT_NAME Ninja_mini)
add_library(${PROJECT_NAME} STATIC ./n_test.cpp)

file msvc_toolchain.cmake

set(CMAKE_C_COMPILER cl.exe)
set(CMAKE_CXX_COMPILER cl.exe)

file n_test.cpp

int main(int argc char** argv)
{
    if (argc == 2)
        return 0;
    else
        return 1;
}