From: nobu.nokada@...
Date: 2004-04-22T04:14:06+09:00
Subject: Re: C ext best practices

Hi,

At Wed, 21 Apr 2004 23:04:11 +0900,
Ara.T.Howard wrote in [ruby-talk:97854]:
> i guess i'm thinking more along the lines of smallish packages, and would like
> avoid having site_ruby/1.8/i686/foobar.so depend on
> /usr/local/lib/libfoobar.so....  (i just had a bad experience supporting some
> software that required LD_RUN_PATH to manage dependancies).  it would be ideal
> if 
> 
>   foobar.so
> 
> was the result of compiling
> 
>   foobar.c  # original C source
>   _foobar.c # ruby binding to it
> 
> obviously this wouldn't apply to packages likely to be updated independently
> (like ImageMagick) but might be o.k. for smallish things like cdb, lockfile
> utils, etc.

Though, makefile created by configure and one created by
extconf.rb, could conflict.  I think you would have to separate
the directories.

One thought (but not tested),

---------- depend:
$(DLLIB): src/foobar.$(LIBEXT)

src/foobar.$(LIBEXT):
	$(RUBY) -C "$(@D)" -e "exec *ARGV" $(MAKE) $(MFLAGS) $(@F)


---------- extconf.rb:
topdir = Dir.pwd
IO.foreach(File.join($srcdir, "depend")) do |line|
  /\$\(DLLLIB\):\s*(.*\.\$\(LIBEXT\))/ =~ line or next
  lib = $1
  subdir = File.dirname(lib)
  Dir.mkdir(subdir) rescue nil
  Dir.chdir(subdir) do
    srcdir = $srcdir
    unless File.expand_path(srcdir, topdir) == File.expand_path(srcdir)
      srcdir = File.join("..", srcdir)
    end
    system(File.join(srcdir, "configure"), *ARGV) or exit
  end
  $LOCAL_LIBS << " " + lib
end
create_makefile("foobar")

-- 
Nobu Nakada