I am having compiler and intellisense problems with the arduino RPC library.
The problem can be reproduced with an public example from https://github.com/hpssjellis/my-examples-for-the-arduino-portentaH7/blob/master... Attached the VS repository (jsc-sandbox-201210.zip) and ErrorList and OutputList (arduino_RPC.txt)
Thank you very much for your help and advice!
Johannes

Updates:

NOTE: Ensure the Serial Debugger is set to OFF (Change it to Serial, then change it back to Off)

For the referenced Example Code, making the below changes allows it to compile correctly in Visual Micro:

1) Right Click Project in Solution Explorer > Add > Local Board.txt
2) Add the below entries to the file and save it

vm.build.tools-8dot3=false
vm.build.path-8dot3=false
vm.build.compile-includes-8dot3=false
vm.build.compile-source-8dot3=false
 

3) Build Example project

For the Supplied Project, perform the same steps as above for the Local Board.txt, and Serial Debug Disable, then:
1) Remove the #include <RPC_client.h> from the top of the INO file
2) Remove the Project reference to the RPC Library in the project folder

It should now build as expected.

No problem, the board.txt allows overrides at a project level to the build properties, which are shown in the Build Output.

These specific properties are from vMicro, most properties come from the board packages board.txt and platform.txt.

We will investigate this further, and make the necessary changes within vMicro so this additional change is not needed in the future, and will update when this has been completed.