bperrybap:
All the other Arduino libraries like your Entropy library are still being treated like a library by the IDE.
The IDE doesn't create a library .a archive file for it but otherwise the library is being handled
very similar to a "normal" library.
The files in the library are each compiled separately from the users code (sketch files) and then
then the library objects are linked in with the users code.
(The library files are not included or merged into the same compilation unit as the users sketch)
The only difference between "real" libraries and what the IDE is doing
is that with the exception of the Arduino core library, the compiled objects in the other libraries
are not archived into a .a archive file before they are linked in.--- bill
It doesn't appear to me that the Arduino IDE is treating them as libraries, but rather as additional source files included in a make like environment. In that environment I would feed defines to my make file to control the compilation of the executable. That is what I am looking for here; however, I think the template specialization may make a cleaner solution, or perhaps I can simply rely on the linker to not include any methods which aren't used as you described above; however, that behavior wasn't what I thought occurred. I thought if you used some of a classes code, then all of it were included.