Included mono libraries interfere with applications that embed mono/xamarin.mac

Type: Debugger

Describe the bug

• OS and Version: macOS 11.0.1
• VS Code Version: 1.51.1
• C/C++ Extension Version: 1.1.3

When debugging an application that embeds mono, the MONO_PATH environment variable that is set during debugging in debugAdapters/OpenDebugAD7 causes the application's embedded mono to use the assemblies included in this extension instead of their own. This environment variable should be avoided, or unset before launching the application.

To Reproduce
This is my launch.json:

        {
            "name": "Launch My App",
            "type": "cppdbg",
            "request": "launch",
            "program": "/path/to/MyApp.app/Contents/MacOS/MyApp",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "externalConsole": false,
            "MIMode": "lldb",
        }

An easy way to avoid this problem I found is to add this line to launch.json, but it should not be necessary:

            "environment": [ { "name": "MONO_PATH", "value": "" }]

Start in debugAdapters/OpenDebugAD7, where MONO_PATH is set during debugging, and inspect how the launch environment is assembled for the launch.json example. Reproduce the macOS case with an application embedding Mono; done means the application no longer uses the extension's assemblies without requiring a MONO_PATH override.