Rakefile

require 'bundler/gem_tasks'
require 'rspec/core/rake_task'
require 'rake/extensiontask'

EXAMPLES_BASE_DIR = 'examples/c'
EXAMPLES_BIN_DIR = 'bin/examples'
OS = Gem::Platform::local.os

CLEAN << EXAMPLES_BIN_DIR

RSpec::Core::RakeTask.new(:spec)

Rake::ExtensionTask.new ('sound_io') { |ext| ext.lib_dir = 'lib/sound_io' }

task build: :compile

task 'compile:examples' => :clean do  
  raise "Unssuported OS: #{OS}" unless OS == 'darwin' || OS == 'linux'

  Dir.mkdir(EXAMPLES_BIN_DIR)
  lib_path = '/usr/local/lib'

  raise "#{lib_path} not found" unless File.exist?(lib_path)

  Dir["#{EXAMPLES_BASE_DIR}/*.c"].each do |c_file|
    exe_name = File.basename(c_file, '.c')
    libm = exe_name == 'play' ? '-lm' : ''
    out_path = "#{EXAMPLES_BIN_DIR}/#{exe_name}"

    puts `cc #{c_file} -L#{lib_path} -lsoundio #{libm} -o #{out_path}`
  end
end

task default: [:clobber, :compile, :spec]