Setting the Source Search Path - GNAT User's Guide for Native Platforms / Unix and Windows

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13.1.6 Setting the Source Search Path

To define the search path for the input source file, gnatpp uses the same switches as the GNAT compiler, with the same effects.

-Idir: The same as the corresponding gcc switch
-I-: The same as the corresponding gcc switch
-gnatec=path: The same as the corresponding gcc switch