[SOLVED] How can Poplar codelets include code from other header files?

How can Poplar codelets include code from other header files?

Is it possible for codelets to reference code in other files, like header files?

If I have a codelet file

    //FileA.cpp
    #include "FileB.h"
    class SomeCustomVertex : public Vertex { 
    public:
       bool compute() {
          int a = SomeConstantDefinedInFileB; 
       }
    ... 
    }

and some other "codelet" file

    //FileB.h
    const int SomeConstantDefineInFileB = 42;

and in the host graph program:

graph.addCodelets({"codelets/FileA.cpp", "codelets/FileB.h"});

I get a compile error from popc:

fatal error: 'FileB.h' file not found
#include "FileB.h"
         ^~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
terminate called after throwing an instance of 'poplar::graph_program_compilation_error'
  what():  Codelet compilation failed (see compiler output for details)

Solution

I figured this out.

Graph::addCodelets has a parameter StringRef compileFlags = "", which you can use to inject compiler options.

popc --help shows an option

-I arg                        Add directory to include search path

So when I use graph.addCodelets({"codelets/FileA.cpp"}, "-I codelets"); in the host program, and have my codelets in 'codelets' subdirectory, this works. No need to explicitly list the ".h" files in the arguments.

Incidentally, also a good way to ensure compiler optimisation (-O3) for the custom codelets.