The MSVC based builds still have the old flag -d2Zi+ set; this is as far as I know undocumented, the name of the flag is since VS2013 -Zo .
However the flag is enabled by default for a long time , so it should be fine to remove it completely.

See the VS2017 documentation :
https://docs.microsoft.com/en-us/cpp/build/reference/zo-enhance-optimized-debugging?view=vs-2017

"The /Zo option is enabled by default in Visual Studio when you specify debugging information with /Zi or /Z7. Specify /Zo- to explicitly disable this compiler option.
The /Zo switch is available starting in Visual Studio 2013 Update 3, and it replaces the previously undocumented /d2Zi+ switch."