$MAJOR, $MINOR, $TEENY =
  open(File.join($srcdir, "eruby.h")).grep(/ERUBY_VERSION/)[0].scan(/(\d+).(\d+).(\d+)/)[0]
$MAJOR_MINOR = format("%02d", ($MAJOR.to_i * 10 + $MINOR.to_i))
AC_SUBST("MAJOR")
AC_SUBST("MINOR")
AC_SUBST("TEENY")
AC_SUBST("MAJOR_MINOR")

AC_MSG_CHECKING("whether we are using gcc")
if $CC == "gcc" || `#{$CC} -v 2>&1` =~ /gcc/
  $using_gcc = true
  $CFLAGS += " -Wall"
else
  $using_gcc = false
end
AC_MSG_RESULT($using_gcc)

AC_MSG_CHECKING("Ruby version")
AC_MSG_RESULT(RUBY_VERSION)
if RUBY_VERSION < "1.6"
  AC_MSG_ERROR("eruby requires Ruby 1.6.x or later.")
end

AC_MSG_CHECKING("for default charset")
$DEFAULT_CHARSET = "iso-8859-1"
AC_ARG_WITH("charset",
"  --with-charset=CHARSET  default charset is CHARSET [iso-8859-1]") { |withval|
  $DEFAULT_CHARSET = withval
}
AC_MSG_RESULT($DEFAULT_CHARSET)
AC_DEFINE("ERUBY_DEFAULT_CHARSET", $DEFAULT_CHARSET)

AC_MSG_CHECKING("whether enable shared")
$ENABLE_SHARED = false
AC_ARG_ENABLE("shared",
	      "  --enable-shared         build a shared library for eruby") { |enableval|
  if enableval == "yes"
    if /-mswin32/ =~ RUBY_PLATFORM
      AC_MSG_ERROR("can't enable shared on mswin32")
    end
    $ENABLE_SHARED = true
  end
}
AC_MSG_RESULT($ENABLE_SHARED)

$LIBERUBY_A = "liberuby.a"
$LIBERUBY = "${LIBERUBY_A}"
$LIBERUBYARG="$(LIBERUBY_A)"

$LIBERUBY_SO = "liberuby.#{CONFIG['DLEXT']}.$(MAJOR).$(MINOR).$(TEENY)"
$LIBERUBY_ALIASES = "liberuby.#{CONFIG['DLEXT']}"

if $ENABLE_SHARED
  $LIBERUBY = "${LIBERUBY_SO}"
  $LIBERUBYARG = "-L. -leruby"
  case RUBY_PLATFORM
  when /-sunos4/
    $LIBERUBY_ALIASES = "liberuby.so.$(MAJOR).$(MINOR) liberuby.so"
  when /-linux/
    $DLDFLAGS = '-Wl,-soname,liberuby.so.$(MAJOR).$(MINOR)'
    $LIBERUBY_ALIASES = "liberuby.so.$(MAJOR).$(MINOR) liberuby.so"
  when /-(freebsd|netbsd)/
    $LIBERUBY_SO = "liberuby.so.$(MAJOR).$(MINOR)"
    if /elf/ =~ RUBY_PLATFORM || /-freebsd[3-9]/ =~ RUBY_PLATFORM
      $LIBERUBY_SO = "liberuby.so.$(MAJOR_MINOR)"
      $LIBERUBY_ALIASES = "liberuby.so"
    else
      $LIBERUBY_ALIASES = "liberuby.so.$(MAJOR) liberuby.so"
    end
  when /-solaris/
    $XLDFLAGS = "-R$(prefix)/lib"
  when /-hpux/
    $XLDFLAGS = "-Wl,+s,+b,$(prefix)/lib"
    $LIBERUBY_SO = "liberuby.sl.$(MAJOR).$(MINOR).$(TEENY)"
    $LIBERUBY_ALIASES = 'liberuby.sl.$(MAJOR).$(MINOR) liberuby.sl'
  when /-aix/
    $DLDFLAGS = '-Wl,-bE:eruby.imp'
    $LIBERUBYARG = "-L$(prefix)/lib -Wl,liberuby.so"
    if $DLDFLAGS !~ /-Wl,/
      $LIBRUBYARG.gsub!(/-Wl,/, '')
      $XLDFLAGS.gsub!(/-Wl,/, '')
      $DLDFLAGS.gsub!(/-Wl,/, '')
    end
    print "creating eruby.imp\n"
    ifile = open("eruby.imp", "w")
    begin
      ifile.write <<EOIF
#!
ruby_filename
eruby_mode
eruby_noheader
eruby_charset
EOIF
    ensure
      ifile.close
    end
  end
end

if /-mswin32/ =~ RUBY_PLATFORM
  $AR = "lib"
  $AROPT = "/out:$@"
  $LIBERUBY_A = "liberuby.lib"
  $LIBERUBY = "$(LIBERUBY_A)"
  $LIBRUBYARG.gsub!(Regexp.compile(Regexp.quote(CONFIG["RUBY_SO_NAME"] + ".lib")), CONFIG["LIBRUBY_A"])
  if /nmake/i =~ $make
    $LD = "$(CC)"
    $VPATH = "{$(VPATH)}"
  elsif RUBY_VERSION < "1.8"
    $LD = "env LIB='$(subst /,\\\\,$(libdir));$(LIB)' $(CC)"
  else
    $LD = "$(CC)"
  end
else
  $AROPT = "rcu $@"
end

AC_SUBST("LIBERUBY_A")
AC_SUBST("LIBERUBY")
AC_SUBST("LIBERUBYARG")
AC_SUBST("LIBERUBY_SO")
AC_SUBST("LIBERUBY_ALIASES")
AC_SUBST("AROPT")

$EXT_DLDFLAGS = CONFIG["DLDFLAGS"]
if $RUBY_SHARED || /mswin32/ =~ RUBY_PLATFORM
  $EXT_LIBRUBYARG = "$(LIBRUBYARG)"
else
  $EXT_LIBRUBYARG = ""
end

if /mswin32/ =~ RUBY_PLATFORM
  if RUBY_VERSION < "1.8"
  if /nmake/i =~ $make
      $MKERUBY = "set LIB=$(libdir:/=\\);$(LIB)\n\t"
  else
      $MKERUBY = "\tenv LIB='$(subst /,\\\\,$(LIBPATH)); $(EXT_LIBRUBYARG) $(LIB)' \\\n\t"
  end
    $MKERUBY << "$(LD) $(LDFLAGS) $(XLDFLAGS) $(OBJS) $(LIBERUBYARG) $(LIBRUBYARG) $(LIBS) -Fe$@"
  else
    $MKERUBY = "$(LD) $(OBJS) $(LIBERUBYARG) $(LIBRUBYARG) $(LIBS) -Fe$@ $(LDFLAGS) $(XLDFLAGS)"
  end
else
  $MKERUBY = "$(LD) $(LDFLAGS) $(XLDFLAGS) $(OBJS) $(LIBERUBYARG) $(LIBRUBYARG) $(LIBS) -o $@"
end

if $DLEXT != $OBJEXT
  if /mswin32/ =~ RUBY_PLATFORM
    if RUBY_VERSION < "1.8"
    if /nmake/i =~ $make
        $MKDLLIB = "set LIB=$(libdir:/=\\);$(LIB)\n\t"
      else
        $MKDLLIB = "\tenv LIB='$(subst /,\\\\,$(LIBPATH)); $(EXT_LIBRUBYARG) $(LIB)' \\\n\t"
      end
      $MKDLLIB << "$(LDSHARED) $(EXT_DLDFLAGS) -Fe$(DLLIB) $(EXT_OBJS) $(XLDFLAGS) $(LIBERUBYARG) $(EXT_LIBRUBYARG) $(LIBS) -link /INCREMENTAL:no /EXPORT:Init_eruby"
    else
      $DEFFILE = 'eruby.def'
      File.open($DEFFILE, 'w') do |deffile|
        deffile.puts "EXPORTS"
        deffile.puts "Init_eruby"
    end
      $MKDLLIB = "$(LDSHARED) $(EXT_OBJS) $(LIBS) $(LIBERUBYARG) $(EXT_LIBRUBYARG) -Fe$(DLLIB) $(EXT_DLDFLAGS) $(XLDFLAGS)"
  end
  else
    $MKDLLIB = "$(LDSHARED) $(EXT_DLDFLAGS) -o $(DLLIB) $(EXT_OBJS) $(XLDFLAGS) $(LIBERUBYARG) $(EXT_LIBRUBYARG) $(LIBS)"
  end
else
  case RUBY_PLATFORM
  when "m68k-human"
    $MKDLLIB = "ar cru $(DLLIB) $(EXT_OBJS) $(LIBS)"
  else
    $MKDLLIB = "ld $(DLL_DLDFLAGS) -r -o $(DLLIB) $(EXT_OBJS) $(LIBERUBYARG) $(EXT_LIBRUBYARG) $(LIBS)"
  end
end

AC_SUBST("EXT_DLDFLAGS")
AC_SUBST("EXT_LIBRUBYARG")
AC_SUBST("MKERUBY")
AC_SUBST("MKDLLIB")
AC_SUBST("DEFFILE")

AC_CONFIG_HEADER("config.h")
AC_OUTPUT("Makefile")

# Local variables:
# mode: Ruby
# tab-width: 8
# End: