Can we rename COMPlus_ to DOTNET_ for environment variables?

[stephentoub]

We have a lot of configuration possible via environment variables that begin with the prefix "COMPlus", e.g. all of the values in https://github.com/dotnet/runtime/blob/16c48d6a45d4d706c327fc840e1a5d450fb189ae/src/coreclr/inc/clrconfigvalues.h.

This is 20-year old legacy finding its way into user-visible configuration for the platform.

Can we rename this to "DOTNET"?

If there are concerns about tools that have hardcoded "COMPlus", we could support both for a few releases and then delete the "COMPlus" support when the majority of hardcodings have switched over.

[huoyaoyuan]

COMPLUS used in code can also be renamed, for example COMPLUSTHROW. This can have less impact.

[danmoseley]

I think I suggested this a while back as we have some DOTNET_ already eg DOTNET_DiagnosticPorts. Presumably it would be easy to support both for several releases, or even indefinitely for some selected ones that are widely used.

I think it comes down to whether these are temporary things that aren't really documented, where names don't matter much, or they are supported dials and it seems increasingly some of them are de-facto supported and it's confusing.

[gfoidl]

In case of the rename it should be double-checked if / how this interferes with Generic Host configuration. Just to be on the safe side.

[danmoseley]

I think it comes down to whether these are temporary things that aren't really documented, where names don't matter much, or they are supported dials and it seems increasingly some of them are de-facto supported and it's confusing.

It also occurs to me, is it clear enough which are supported and which are not? Is it simply - which ones are documented? Eg., COMPlus_GCRetainVM is documented even though in the code it is UNSUPPORTED_GCRetainVM

[vanbukin]

Maybe CLR_ instead of DOTNET_?

[AraHaan]

How about create dummy ones that loop back to the renamed ones but mark them as obsolete to warn the users against using them (and have it state the renamed copy)?