Automatically include/compile all Ruby C extension source files (including subdirectories) using mkmf

extconfig.rb

require "mkmf"

ext_name = 'my_extension'
excluded = ['x86', 'x64']

dir_config(ext_name)

$srcs = Dir.glob("#{$srcdir}/**/*.c").map { |path| File.basename(path) }
Dir.glob("#{$srcdir}/*/") do |path|
  dir =  File.basename(path)
  next if excluded.include?(dir)
  $VPATH << "$(srcdir)/#{dir}"
  $INCFLAGS << " -I$(srcdir)/#{dir}"
end

create_makefile(ext_name)