#!/usr/bin/env ruby

require 'mkmf'

if defined?(CFLAGS)
  if CFLAGS.index(CONFIG['CCDLFLAGS'])
    $CFLAGS = CFLAGS
  else
    $CFLAGS = CFLAGS + ' ' + CONFIG['CCDLFLAGS']
  end
else
  $CFLAGS = CONFIG['CFLAGS']
end
$LDFLAGS = CONFIG['LDFLAGS']
$LIBPATH.push(Config::CONFIG['libdir'])

def crash(str)
  printf(" extconf failure: %s\n", str)
  exit 1
end

dir_config('iconv')
dir_config('xml2')
dir_config('zlib')

have_library('socket','socket')
have_library('nsl','gethostbyname')

unless have_library('m', 'atan')
  # try again for gcc 4.0
  saveflags = $CFLAGS
  $CFLAGS += ' -fno-builtin'
  unless have_library('m', 'atan')
    crash('need libm')
  end
  $CFLAGS = saveflags
end

unless have_library('z', 'inflate') or
       have_library('zlib1', 'inflate')
  crash('need zlib')
else
  $defs.push('-DHAVE_ZLIB_H')
end

unless have_library('iconv','iconv_open') or 
       have_library('iconv','libiconv_open') or
       have_library('c','iconv_open') or
       have_library('recode','iconv_open') or
       have_library('iconv')
  crash(<<EOL)
need libiconv.

	Install the libiconv or try passing one of the following options
	to extconf.rb:

	--with-iconv-dir=/path/to/iconv
	--with-iconv-lib=/path/to/iconv/lib
	--with-iconv-include=/path/to/iconv/include
EOL
end

unless (have_library('xml2', 'xmlParseDoc') or
        have_library('libxml2', 'xmlParseDoc') or
        find_library('xml2', '/opt/lib', '/usr/local/lib', '/usr/lib')) and 
       (have_header('libxml/xmlversion.h') or
        find_header('libxml/xmlversion.h',
        						"#{CONFIG['prefix']}/include", 
                    '/opt/include/libxml2', 
                    '/usr/local/include/libxml2', 
                    '/usr/include/libxml2'))
  crash(<<EOL)
need libxml2.

        Install the library or try one of the following options to extconf.rb:

        --with-xml2-dir=/path/to/libxml2
        --with-xml2-lib=/path/to/libxml2/lib
        --with-xml2-include=/path/to/libxml2/include
EOL
end

unless have_library('xml2', 'xmlDocFormatDump')
  crash('Your version of libxml2 is too old.  Please upgrade.')
end

unless have_func('docbCreateFileParserCtxt')
  crash('Need docbCreateFileParserCtxt')
end

if try_compile('int main() { return 0; }','-Wall')
  $CFLAGS << ' -Wall'
end

$CFLAGS << ' ' << $INCFLAGS
$INSTALLFILES = [["libxml.rb", "$(RUBYLIBDIR)", "../xml"]]

create_header()
create_makefile('xml/libxml_so')