Hello,

Is it possible to add additional directories to the complier's search path? Either through -I or -iquote command line variables? 

I'm trying to make this work:
Solution
+ Shared Project
++ ComplierDefinitions
+++ Definitions.h
+ Arduino Project
+ CLR Project
++ ComplierDefinitions
+++ Definitions.h


Various files in the Shared Project and Arduino Project do
#include "Definitions.h"

For the Arduino Project I want this to reference the one in Shared Project/Compiler Definitions; for the CLR Project I want it to reference the one in CLR Project/CompilerDefinitions

So I hoped I could add $(ProjectDir)CompilerDefintions to the include path property for the Arduino Project and CLR Project projects. 

I tried adding $(ProjectDir)CompilerDefinitions to my Arduino Project but that doesn't seem to do it (I see the avr-g++ call in the output window when building Arduino Project but it doesn't include my extra folder). 

Kind regards
Paul.

Thanks for the update. Yes the extra flags are a simple way to add paths. 

Using Visual Studio shared projects can also be useful and make it easier to edit and see the code in the solution explorer.