Visual Studio: user depended defines - c++

Question

In our team is an old developer, who likes Debug-Message-Boxes. Not for just the current debugging session, no, forever. So when running the program in debugging mode, the boxes are nagging all the other developers. But we are not allowed to remove the boxes.
So, is there a possibility to define a DEFINE deepened on user / computer? So, we can do this:
#ifdef _DEBUG
#ifndef NONAG
MessageBox(...);
#endif
#endif
-> and now, we can define "NONAG" and have more fun..
Thanks

Answer 1

With a standard setup, a {ProjectName}.vcxproj.user props file will be created next to your normal project.
Its a standard props file which shouldn't be checked into source control and so lets each individual user set personal project settings including preprocessor macros. So change that file to be something like:
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemDefinitionGroup>
<ClCompile>
<PreprocessorDefinitions>NONAG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
</ClCompile>
</ItemDefinitionGroup>
</Project>
Alternatively you can setup custom props file by including something like in your project or common props file:
<ImportGroup Label="PropertySheets">
<Import Project="{some custom props file path}" Condition="exists('{some custom props file path}')"/>
</ImportGroup>