Here's one way that works for me:
Firstly compile the cpp file into xkcd.o: 
g++ -c xkcd.cpp

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Then create a static library (named, say, libxkcd.a) from the generated xkcd.o: 
ar -rc libxkcd.a xkcd.o

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Then before the "use Inline CPP;" line in test.pl I inserted: 
use Inline CPP => Config =>
  BUILD_NOISY => 1,
  INC => '-ID:/w/xkcd',
  LIBS => '-LD:/w/xkcd -lxkcd',
;

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The "BUILD_NOISY" directive just allows you to see the compilation during the initial run.
The 'INC' and 'LIBS' directives allow xkcd.h and libxkcd.a to be located, as needed during the build.
Obviously, for me both of those files were located in the D:/w/xkcd directory. For me, the script then outputs: 
Perfect random number: 4
Perfect random number: 4
Perfect random number: 4

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I think it might be important that there's an empty line or 2 at the bottom of all three test.pl, xkcd.h and xkcd.cpp files.

Cheers,
Rob

In reply to Re: External (extra) files when using Inline::CPP by syphilis
in thread External (extra) files when using Inline::CPP by cavac

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