I am trying to have my exe use /MTd instead of the default /MTd, but when I generate my project, it will still have /MDd in the Code Generation and Command Line when looking at the TestFlags property page. I have tried both a string replace and a set for CMAKE_CXX_FLAGS_DEBUG . Is there something that I am missing?

I am attempting this with CMake 3.28.1 and Visual Studio 2022

cmake_minimum_required(VERSION 3.28)

#
project(CompileFlags CXX)

# 
add_executable(TestFlags main.cpp)

# set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Wall -g /MTd")
# Replace /MDd with /MTd for Debug configuration
string(REPLACE "/MDd" "/MTd" CMAKE_CXX_FLAGS_DEBUG ${CMAKE_CXX_FLAGS_DEBUG})

# Print out the debug flags
message("Debug flags: ${CMAKE_CXX_FLAGS_DEBUG}")

My output cmake output will be

Selecting Windows SDK version 10.0.22621.0 to target Windows 10.0.19045.
Debug flags: /MTd /Zi /Ob0 /Od /RTC1
Configuring done (0.0s)
Generating done (0.0s)