From: Quintus <sutniuq@...>
Date: 2012-02-10T06:58:50+09:00
Subject: Ruby C-Extensions: Compile files in subdirectory?

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Hi folks,

I’m writing a C extension (it’s actually C++ but that doesn’t matter
for this problem) for Ruby that consists of many files that
are intended to be compiled into a _single_ C extension, not a dozen
ones. To structure the code, I’ve got some subdirectories under the ext/
directory, i.e. my directory structure looks something like this:

/
  ext/
    - extconf.rb
    - my_ext.c
    - my_ext.h
    thing1/
      - thing1.c
      - thing1.h
      - thing1_2.c
      - thing1_2.h
    thing2/
      - thing2.c
      - thing2.h
      thing2_1/
        - something.c
        - something.h

Now, as I said before I want a single C extension "my_ext.so", but I
just can't find out how to instruct mkmf to recognise subdiretories.
It just compiles the files residing in the toplevel directory into
object files, completely ignoring all the subdirectories. So, my
question is: How to tell mkmf about the subdirectories?

Valete,
Marvin
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