#!/usr/bin/env ruby
require 'mkmf'
require 'rbconfig'
dir_config("ffi_c")

unless Config::CONFIG['host_os'] =~ /mswin32|mingw32/
  if pkg_config("libffi") || find_header("ffi.h", "/usr/local/include")

    # We need at least ffi_call and ffi_prep_closure
    libffi_ok = have_library("ffi", "ffi_call", [ "ffi.h" ]) && have_func("ffi_prep_closure")
    
    # Check if the raw api is available.
    $defs << "-DHAVE_RAW_API" if have_func("ffi_raw_call") && have_func("ffi_prep_raw_closure")
  end
end

have_func('rb_thread_blocking_region')
have_func('ruby_thread_has_gvl_p')
have_func('ruby_native_thread_p')
have_func('rb_thread_call_with_gvl')

$defs << "-DHAVE_EXTCONF_H" if $defs.empty? # needed so create_header works
$defs << "-DUSE_INTERNAL_LIBFFI" unless libffi_ok
$defs << "-DRUBY_1_9" if RUBY_VERSION >= "1.9.0"

create_header

$CFLAGS << " -mwin32 " if Config::CONFIG['host_os'] =~ /cygwin/
#$CFLAGS << " -Werror -Wunused -Wformat -Wimplicit -Wreturn-type "

create_makefile("ffi_c")
unless libffi_ok
  File.open("Makefile", "a") do |mf|
    mf.puts "LIBFFI_HOST=--host=#{Config::CONFIG['host_alias']}" if Config::CONFIG.has_key?("host_alias")
    if Config::CONFIG['host_os'].downcase =~ /darwin/
      mf.puts "include ${srcdir}/libffi.darwin.mk"
    elsif Config::CONFIG['host_os'].downcase =~ /bsd/
      mf.puts '.include "${srcdir}/libffi.bsd.mk"'
    else
      mf.puts "include ${srcdir}/libffi.mk"
    end
  end
end
