#!/usr/bin/perl -w

use strict;
use warnings;
use Getopt::Long;
use File::Temp;

my %global_options = (
		      'prefix' => '/usr/local',
		      'enable-google-japanese-input' => !0,
		      'enable-https' => !0,
		      'enable-gnutls' => !0,
		      'enable-openssl' => !0,
		     );
my %global;
$global{'project_identifier'} = 'YASKKSERV';
$global{'version'} = '0.6.1';

# CompilerIsSupport($compiler_version, 3, 2, 1);
sub CompilerIsSupport ($$$$) {
    my $compiler_version = $_[0];
    my $major = $_[1];
    my $minor = $_[2];
    my $sub = $_[3];

    if ($compiler_version >= $major * 1000000 + $minor * 1000 + $sub * 1) {
	return !0;
    } else {
	return 0;
    }
}

sub CompilerCheck ($$;$) {
    my $check_header = $_[0];
    my $check_body = $_[1];
    my $check_option = defined($_[2]) ? $_[2] : '';

    # thanks! KURASHIKI-san and Debian
    my $temporary_filename_base = '/tmp/yaskkserv.configure.XXXXX';
    my ($wfh_dummy, $temporary_filename_o) = File::Temp::mkstemps($temporary_filename_base, '.o');
    my ($wfh, $temporary_filename_c) = File::Temp::mkstemps($temporary_filename_base, '.c');
    print $wfh $check_header;
    print $wfh qq!int main(int argc, char *argv[])\n{\n!;
    print $wfh $check_body;
    print $wfh qq!return 0;\n}\n!;
    close($wfh);

    # thanks! KURASHIKI-san
    my $c = "$global{'compiler'} $check_option -c $temporary_filename_c -o $temporary_filename_o >/dev/null 2>&1";
    system($c);
    my $result = $? ? 0 : !0;

    unlink($temporary_filename_o);
    unlink($temporary_filename_c);

    return $result;
}

sub LinkerCheckLibrary ($) {
    my $library_option = $_[0];

    my $temporary_filename_base = '/tmp/yaskkserv.configure.XXXXX';
    my ($wfh_dummy, $temporary_filename_execute) = File::Temp::mkstemps($temporary_filename_base, '');
    my ($wfh, $temporary_filename_c) = File::Temp::mkstemps($temporary_filename_base, '.c');
    print $wfh qq!int main(int argc, char *argv[])\n{\n!;
    print $wfh qq!return 0;\n}\n!;
    close($wfh);

    my $c = "$global{'compiler'} $temporary_filename_c -o $temporary_filename_execute $library_option >/dev/null 2>&1";
    system($c);
    my $result = $? ? 0 : !0;

    unlink($temporary_filename_execute);
    unlink($temporary_filename_c);

    return $result;
}

sub isGcc () {
    if ($global{'compiler'} =~ /gcc/) {
	return !0;
    }
    0;
}

sub isClang () {
    if ($global{'compiler'} =~ /clang/) {
	return !0;
    }
    0;
}

sub getPkgConfig {
    my $command = $_[0];
    my $args = $_[1];
    my $result;
    if (defined($global{'pkg-config'})) {
	my $tmp = `pkg-config $command $args 2>&1`;
	if ($? == 0) {
	    chomp($tmp);
	    $result = $tmp;
	}
    }
    return $result;
}

$global{'data'} .= "# -*- Makefile -*-\n";
$global{'data'} .= "#\n";
$global{'data'} .= "# $0";
foreach (@ARGV) {
    $global{'data'} .= " $_";
}
$global{'data'} .= "\n";
$global{'data'} .= "#\n";
$global{'data'} .= "# " . localtime() . "\n";
$global{'data'} .= "#\n";
$global{'data'} .= "# * DO NOT EDIT! *\n";
$global{'data'} .= "#\n";

GetOptions('gplusplus=s' => \$global_options{'gplusplus'},
	   'compiler=s' => \$global_options{'compiler'},
           'help' => \$global_options{'help'},
           'enable-google-japanese-input' => \$global_options{'enable-google-japanese-input'},
           'disable-google-japanese-input' => \$global_options{'disable-google-japanese-input'},
           'enable-google-suggest' => \$global_options{'enable-google-suggest'},
           'disable-google-suggest' => \$global_options{'disable-google-suggest'},
           'enable-syslog' => \$global_options{'enable-syslog'},
           'disable-syslog' => \$global_options{'disable-syslog'},
           'enable-error-message' => \$global_options{'enable-error-message'},
           'disable-error-message' => \$global_options{'disable-error-message'},
           'enable-https' => \$global_options{'enable-https'},
           'disable-https' => \$global_options{'disable-https'},
           'enable-gnutls' => \$global_options{'enable-gnutls'},
           'disable-gnutls' => \$global_options{'disable-gnutls'},
           'enable-openssl' => \$global_options{'enable-openssl'},
           'disable-openssl' => \$global_options{'disable-openssl'},
           'precompile' => \$global_options{'precompile'},
           'prefix=s' => \$global_options{'prefix'});

if (defined($global_options{'help'})) {
    print "$0 usage\n";
    print "    --gplusplus=COMPILER            *DEPRECATED* compiler [default g++]\n";
    print "    --compiler=COMPILER             compiler (g++, clang++ or etc) [default g++]\n";
    print "    --help                          print this message\n";
    print "    --enable-google-japanese-input  enable google japanese input (for yaskkserv_hairy) [default enable]\n";
    print "    --disable-google-japanese-input disable google japanese input (for yaskkserv_hairy) [default enable]\n";
    print "    --enable-google-suggest         enable google suggest (for yaskkserv_hairy) [default disable]\n";
    print "    --disable-google-suggest        disable google suggest (for yaskkserv_hairy) [default disable]\n";
    print "    --enable-syslog                 enable syslog [default]\n";
    print "    --disable-syslog                disable syslog\n";
    print "    --enable-error-message          enable error message [default]\n";
    print "    --disable-error-message         disable error message\n";
    print "    --enable-https                  enable HTTPS [default]\n";
    print "    --disable-https                 disable HTTPS\n";
    print "    --enable-gnutls                 enable GnuTLS [default]\n";
    print "    --disable-gnutls                disable GnuTLS\n";
    print "    --enable-openssl                enable OpenSSL [default]\n";
    print "    --disable-openssl               disable OpenSSL\n";
    print "    --precompile                    use precompile (for G++ 4.0 or newer)\n";
    print "    --prefix=PREFIX                 install root directory [/usr/local]\n";
    die;
}

{
    $_ = `pkg-config --version 2>&1`;
    if (defined($_)) {
	$global{'pkg-config'} = $_;
	print "pkg-config (found)\n";
    } else {
	print "pkg-config (not found)\n";
    }
}

{
    if (defined($global_options{'gplusplus'})) {
	$global{'compiler'} = $global_options{'gplusplus'};
	print "*** Warning : --gplusplus is deprecated\n";
    } elsif (defined($global_options{'compiler'})) {
	$global{'compiler'} = $global_options{'compiler'};
    } else {
	my $tmp = 'g++';
	$_ = `$tmp -v 2>&1`;
	if (defined($_)) {
	} else {
	    $tmp = 'clang++';
	    $_ = `$tmp -v 2>&1`;
	    unless (defined($_)) {
		print STDERR "*** Warning : compiler not found!\n";
	    }
	}
	$global{'compiler'} = $tmp;
    }
    $global{'data'} .= "export COMPILER				= $global{'compiler'}\n";
}

{
    my $tmp = 'make';
    $_ = `$tmp -v 2>&1`;
    if (defined($_) and /gnu\s*make/im) {
	print "GNU Make ($tmp)\n";
    } else {
	$tmp = 'gmake';
	$_ = `$tmp -v 2>&1`;
	if (defined($_) and /gnu\s*make/im) {
	    print "GNU Make ($tmp)\n";
	} else {
	    $tmp = 'gnumake';
	    $_ = `$tmp -v 2>&1`;
	    if (defined($_) and /gnu\s*make/im) {
		print "GNU Make ($tmp)\n";
	    } else {
		print STDERR "*** Warning : GNU Make not found!\n";
	    }
	}
    }
}

{
    $global{'data'} .= "export MKDIR				= mkdir\n";
}

{
    $global{'data'} .= "export RM				= rm\n";
}

{
    $global{'data'} .= "export PERL				= perl\n";
}

{
    $global{'data'} .= "export INSTALL				= install\n";
}

{
    $global{'data'} .= "export PREFIX				= $global_options{'prefix'}\n";
}

{
    $global{'data'} .= "export PROJECT_IDENTIFIER		= $global{'project_identifier'}\n";
    $_ = $global{'project_identifier'};
    tr/A-Z/a-z/;
    $global{'data'} .= "export PROJECT_IDENTIFIER_LOWER_CASE	= $_\n";
}

{
    $global{'data'} .= "export PROJECT_VERSION			= $global{'version'}\n";
}

{
    $_ = `pwd 2>&1`;
    chomp;
    $global{'project_root'} = $_;
    $global{'data'} .= "export PROJECT_ROOT			= $global{'project_root'}\n";
}

{
    my @compiler_version;
    foreach (split(/[\r\n]+/, `$global{'compiler'} -v 2>&1`)) {
	if (/\s*clang\s+version/ and m!\s+(\d+)\.(\d+)\.?(\d+)?!) {
	    @compiler_version = ($1, $2, $3);
	    last;
	} elsif (/^\s*gcc\s+version/ and m!\s+(\d+)\.(\d+)\.?(\d+)?!) {
	    @compiler_version = ($1, $2, $3);
	    last;
	}
    }

    if ($#compiler_version == -1) {
	$global{'compiler_version'} = 0;
	print STDERR "*** Warning : compiler version check failed.\n";
    } else {
	my $pow = $#compiler_version;
	foreach (@compiler_version) {
	    $_ = 0 unless defined($_);
	    $global{'compiler_version'} += $_ * (1000 ** $pow);
	    --$pow;
	}
	my $tmp;
	foreach (@compiler_version) {
	    $tmp .= "$_.";
	}
	chop $tmp;
	print "compiler $global{'compiler'} ($tmp)\n";
    }

    if (isGcc()) {
	unless (CompilerIsSupport($global{'compiler_version'}, 3, 3, 0)) {
	    print STDERR "*** Warning : G++ is too old. need version 3.3 or newer.\n";
	}
    }
}

if (defined($global_options{'precompile'})) {
    if (isClang()) {
	$global{'data'} .= "export USE_PRECOMPILE   		= t\n";
    } elsif (isGcc()) {
	if (CompilerIsSupport($global{'compiler_version'}, 4, 0, 0)) {
	    $global{'data'} .= "export USE_PRECOMPILE   		= t\n";
	} else {
	    print STDERR "*** Warning : G++ is too old. need version 4.0 or newer.\n";
	}
    }
}

{
    $_ = pack('V', 1);
    if (unpack('C', $_) == 1) {
	$global{'data'} .= "export CXXFLAGS_BYTE_ORDER		= -D $global{'project_identifier'}_ARCHITECTURE_BYTE_ORDER_VAX\n";
    } else {
	$global{'data'} .= "export CXXFLAGS_BYTE_ORDER		= -D $global{'project_identifier'}_ARCHITECTURE_BYTE_ORDER_NETWORK\n";
    }

    $global{'data'} .= "export CXXFLAGS_CONFIG			= \n";
    unless (defined($global_options{'disable-syslog'})) {
	$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ENABLE_SYSLOG\n";
    }

    unless (defined($global_options{'disable-error-message'})) {
	$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ENABLE_ERROR_MESSAGE\n";
    }

    if (defined($global_options{'enable-google-japanese-input'}) and
	!defined($global_options{'disable-google-japanese-input'})) {
	{
	    $_ = 'iconv.h';
	    my $found_flag;
	    my $header_symbol = $_;
	    $header_symbol =~ tr/a-z/A-Z/;
	    $header_symbol =~ s![\./]!_!g;
	    if (CompilerCheck("#include <$_>\n", '')) {
		my $const_char_code = <<EOT;
iconv_t icd;
const char *in_buffer = 0;
char *out_buffer = 0;
size_t in_size = 0;
size_t out_size = 0;
iconv(icd, &in_buffer, &in_size, &out_buffer, &out_size);
EOT
		my $char_code = <<EOT;
iconv_t icd;
char *in_buffer = 0;
char *out_buffer = 0;
size_t in_size = 0;
size_t out_size = 0;
iconv(icd, &in_buffer, &in_size, &out_buffer, &out_size);
EOT
		if (CompilerCheck("#include <$_>\n", $const_char_code)) {
		    $found_flag = !0;
		    print qq{$_ (argument "const char *" found)\n};
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ICONV_ARGUMENT_CONST_CHAR\n";
		} elsif (CompilerCheck("#include <$_>\n", $char_code)) {
		    $found_flag = !0;
		    print qq{$_ (argument "char *" found)\n};
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ICONV_ARGUMENT_CHAR\n";
		} else {
		    print STDERR "*** Warning : iconv not found\n";
		}
		if (defined($found_flag)) {
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ENABLE_GOOGLE_JAPANESE_INPUT\n";
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HEADER_HAVE_$header_symbol\n";
		    if (defined($global_options{'enable-google-suggest'}) and
			!defined($global_options{'disable-google-suggest'})) {
			$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_ENABLE_GOOGLE_SUGGEST\n";
		    }
		}
	    }
	    unless (defined($found_flag)) {
		print "$_ (not found : DISABLE --enable-google-japanese-input)\n";
		$global_options{'enable-google-japanese-input'} = undef;
	    }
	}
	if (defined($global_options{'enable-https'}) and !defined($global_options{'disable-https'})) {
	    if (defined($global_options{'enable-gnutls'}) and !defined($global_options{'disable-gnutls'})) {
		if (CompilerCheck("#include <gnutls/gnutls.h>\n" .
				  "#include <gnutls/crypto.h>\n" .
				  "#include <gnutls/openssl.h>\n"
				  ,
				  '')) {
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HEADER_HAVE_GNUTLS_OPENSSL\n";
		    $global{'HAVE_GNUTLS_OPENSSL'} = !0;
		    print STDERR "SSL GnuTLS\n";
		}
		if (defined($global{'HAVE_GNUTLS_OPENSSL'})) {
		    if (CompilerCheck("#include <gnutls/gnutls.h>\n" .
				      "#include <gnutls/crypto.h>\n" .
				      "#include <gnutls/openssl.h>\n"
				      ,
				      'RAND_poll();')) {
			$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HEADER_HAVE_RAND_POLL\n";
			print STDERR "SSL GnuTLS RAND_poll() (found)\n";
		    } else {
			print STDERR "SSL GnuTLS RAND_poll() (not found)\n";
		    }
		}
	    }
	    if (!defined($global{'HAVE_GNUTLS_OPENSSL'}) and
		defined($global_options{'enable-openssl'}) and !defined($global_options{'disable-openssl'})) {
		if (CompilerCheck("#include <openssl/crypto.h>\n" .
				  "#include <openssl/ssl.h>\n" .
				  "#include <openssl/err.h>\n" .
				  "#include <openssl/rand.h>\n"
				  ,
				  '')) {
		    $global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HEADER_HAVE_OPENSSL\n";
		    $global{'HAVE_OPENSSL'} = !0;
		    print STDERR "SSL OpenSSL\n";
		}
		if (defined($global{'HAVE_OPENSSL'})) {
		    if (CompilerCheck("#include <openssl/crypto.h>\n" .
				      "#include <openssl/ssl.h>\n" .
				      "#include <openssl/err.h>\n" .
				      "#include <openssl/rand.h>\n"
				      ,
				      'RAND_poll();')) {
			$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HEADER_HAVE_RAND_POLL\n";
			print STDERR "SSL OpenSSL RAND_poll() (found)\n";
		    } else {
			print STDERR "SSL OpenSSL RAND_poll() (not found)\n";
		    }
		}
	    }
	    if (!defined($global{'HAVE_GNUTLS_OPENSSL'}) and !defined($global{'HAVE_OPENSSL'})) {
		if (!defined($global{'HAVE_GNUTLS_OPENSSL'})) {
		    print STDERR "*** Warning : GnuTLS not found(or disable)\n";
		}
		if (!defined($global{'HAVE_OPENSSL'})) {
		    print STDERR "*** Warning : OpenSSL not found(or disable)\n";
		}
	    }
	} else {
	    print STDERR "*** Warning : HTTPS disabled\n";
	}
    } else {
	$global_options{'enable-google-japanese-input'} = undef;
    }
}

{
    if (CompilerCheck("#include <sys/socket.h>\n", "int tmp = MSG_NOSIGNAL;\n")) {
	$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_MACRO_HAVE_SYMBOL_MSG_NOSIGNAL\n";
	print "MSG_NOSIGNAL (found)\n";
    } else {
	print "MSG_NOSIGNAL (not found)\n";
    }
}

{
    if (CompilerCheck("#include <signal.h>\n" .
		      "#include <time.h>\n"
		      ,
		      "timer_t timer_id;\n" .
		      "timer_create(CLOCK_REALTIME, 0, &timer_id);\n")) {
	$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_FUNCTION_HAVE_TIMER_CREATE\n";
	$global{'HAVE_TIMER_CREATE'} = !0;
	print "timer_create() (found)\n";
    } else {
	print "timer_create() (not found)\n";
    }
}

{
    if (CompilerCheck("#include <signal.h>\n" .
		      "#include <pthread.h>\n"
		      ,
		      "sigset_t sigset;\n" .
		      "pthread_sigmask(SIG_SETMASK, &sigset, NULL);\n")) {
	$global{'data'} .= "CXXFLAGS_CONFIG				+= -D $global{'project_identifier'}_CONFIG_HAVE_PTHREAD\n";
	$global{'HAVE_PTHREAD'} = !0;
	print "pthread (found)\n";
    } else {
	print "pthread (not found)\n";
    }
}

{
    $_ = `uname 2>&1`;
    if (/(bsd)/i or /(darwin)/i or /(cygwin)/i or /(linux)/i) {
	$global{'OSNAME'} = $1;
    } else {
	print STDERR "*** Warning : unknown architecture ($_)\n";
	$global{'OSNAME'} = 'linux';
    }
    $global{'architecture'} = 'BSD_CYGWIN_LINUX_GCC';
    $global{'CXXFLAGS_ARCHITECTURE'} = "-D $global{'project_identifier'}_ARCHITECTURE_BSD_CYGWIN_LINUX_GCC";
    if (CompilerCheck('', '', '-std=c++11')) {
	$global{'CXXFLAGS_ARCHITECTURE'} .= ' -std=c++11 -D YASKKSERV_ARCHITECTURE_CXX11';
	print STDERR "c++11 supported\n";
    }
    $global{'LDFLAGS_ARCHITECTURE'} = '';
    $global{'LDFLAGS_LIBRARY_SIMPLE'} = '';
    $global{'LDFLAGS_LIBRARY_NORMAL'} = '';
    $global{'LDFLAGS_LIBRARY_HAIRY'} = '';
    if (LinkerCheckLibrary('-liconv')) {
	$global{'LDFLAGS_LIBRARY_HAIRY'} .= ' -liconv';
    }
    $global{'LDFLAGS_LIBRARY_HAIRY'} .= ' -lrt' if defined($global{'HAVE_TIMER_CREATE'});
    if (defined($global{'HAVE_GNUTLS_OPENSSL'})) {
	my $tmp = getPkgConfig('gnutls', '--libs');
	my $libs;
	if (defined($tmp)) {
	    $libs = ' ' . $tmp . ' -lgnutls-openssl';
	    unless (LinkerCheckLibrary($libs)) {
		$libs = undef;
	    }
	}
	unless (defined($libs)) {
	    if (LinkerCheckLibrary('-lgnutls-openssl')) {
		$libs = ' -lgnutls-openssl';
	    }
	}
	if (defined($libs)) {
	    $global{'LDFLAGS_LIBRARY_HAIRY'} .= $libs;
	} else {
	    print STDERR "*** Warning : GnuTLS library NOT FOUND\n";
	}
    }
    if (defined($global{'HAVE_OPENSSL'})) {
	my $tmp = getPkgConfig('openssl', '--libs');
	my $libs;
	if (defined($tmp)) {
	    $libs = ' ' . $tmp;
	    unless (LinkerCheckLibrary($libs)) {
		$libs = undef;
	    }
	}
	unless (defined($libs)) {
	    if (LinkerCheckLibrary('-lssl -lcrypto')) {
		$libs = ' -lssl -lcrypto';
	    }
	}
	if (defined($libs)) {
	    $global{'LDFLAGS_LIBRARY_HAIRY'} .= $libs;
	} else {
	    print STDERR "*** Warning : OpenSSL library NOT FOUND\n";
	}
    }
    if (defined($global{'HAVE_PTHREAD'})) {
	if (LinkerCheckLibrary('-lpthread')) {
	    $global{'LDFLAGS_LIBRARY_HAIRY'} .= ' -lpthread';
	}
    }

    if (/cygwin/i) {
	$global{'EXECUTE_FILE_SUFFIX'} = '.exe';
    } else {
	$global{'EXECUTE_FILE_SUFFIX'} = '';
    }

    die "unknown architecture \"$_\"" unless defined($global{'architecture'});

    $global{'data'} .= "export CXXFLAGS_ARCHITECTURE		= $global{'CXXFLAGS_ARCHITECTURE'}\n";
    $global{'data'} .= "export LDFLAGS_ARCHITECTURE		= $global{'LDFLAGS_ARCHITECTURE'}\n";
    $global{'data'} .= "export LDFLAGS_LIBRARY_SIMPLE		= $global{'LDFLAGS_LIBRARY_SIMPLE'}\n";
    $global{'data'} .= "export LDFLAGS_LIBRARY_NORMAL		= $global{'LDFLAGS_LIBRARY_NORMAL'}\n";
    $global{'data'} .= "export LDFLAGS_LIBRARY_HAIRY		= $global{'LDFLAGS_LIBRARY_HAIRY'}\n";
    $global{'data'} .= "export ARCHITECTURE			= $global{'architecture'}\n";
    $_ = $global{'architecture'};
    tr/A-Z/a-z/;
    $global{'data'} .= "export ARCHITECTURE_LOWER_CASE		= $_\n";
    $global{'data'} .= "export EXECUTE_FILE_SUFFIX		= $global{'EXECUTE_FILE_SUFFIX'}\n";
    $global{'data'} .= "export OSNAME				= $global{'OSNAME'}\n";
}

{
    $_ = `ccache 2>&1`;
    if ($? >= 0) {
	$global{'data'} .= "export CCACHE				= ccache\n";
	print "ccache (found)\n";
    } else {
	print "ccache (not found)\n";
    }
}

{
    my $common = '';
    if (CompilerCheck('', '', '-march=native')) {
	$common .= '-march=native';
    }
    my $optimize = '';
    if (isClang() or CompilerIsSupport($global{'compiler_version'}, 4, 0, 0)) {
	if (CompilerCheck("#include <math.h>\n", '', '-Ofast')) {
	    $optimize .= '-Ofast';
	} elsif (CompilerCheck("#include <math.h>\n", '', '-O3')) {
	    $optimize .= '-O3';
	    print STDERR "*** Warning : -Ofast failed\n";
	} else {
	    $optimize .= '-Os';
	    print STDERR "*** Warning : -Ofast, -O3 failed\n";
	}
    } else {
	# gcc3 Ϥʪ꤬ꥵʲ뤤ϵ路ʤС
	# ѥХ򤱤뤿˥ץƥޥ٥򲼤ޤ
	$_ = `cat /proc/meminfo 2>&1`;
	my $memory_size = 0 * 1024;
	if (/^MemTotal:\s+(\d+)\s+kB/) {
	    $memory_size = $1;
	    print "memory ($memory_size kB)\n";
	} else {
	    print "memory (unknown)\n";
	}

	if ($memory_size < 320000) {
	    $optimize .= '-Os';
	    print STDERR "*** Warning : optimize level changed (-O3 to -Os)\n";
	} elsif (CompilerCheck("#include <math.h>\n", '', '-O3')) {
	    $optimize .= '-O3';
	} else {
	    $optimize .= '-Os';
	    print STDERR "*** Warning : -O3 failed\n";
	}
    }

    {
	$global{'data'} .= 'export CXXFLAGS_OPTIMIZE_SERVER_SIMPLE	= ';

	$global{'data'} .= "$common -Os\n";
    }

    {
	$global{'data'} .= 'export CXXFLAGS_OPTIMIZE_SERVER_NORMAL	= ';

	$global{'data'} .= "$common -Os\n";
    }

    {
	$global{'data'} .= 'export CXXFLAGS_OPTIMIZE_SERVER_HAIRY	= ';

	$global{'data'} .= "$common $optimize\n";
    }

    {
	$global{'data'} .= 'export CXXFLAGS_OPTIMIZE_TOOL		= ';

	$global{'data'} .= "$common $optimize\n";
    }
}

{
    my $common = '-Wall -Wextra -W -Weffc++ -Wold-style-cast -Woverloaded-virtual -Wsign-promo -Wsynth -Wundef -Wshadow -Wlarger-than-16384 -Wpointer-arith -Wcast-qual -Wcast-align -Wconversion -Wsign-compare -Waggregate-return -Wmissing-noreturn -Wredundant-decls -Wnon-virtual-dtor -Wreorder -Wswitch-default -Wswitch-enum';
    my $common_4_2_0 = '-Wabi -Wcomments -Wctor-dtor-privacy -Wdeprecated -Wendif-labels -Wfloat-equal -Wformat-extra-args -Wformat-nonliteral -Wformat-security -Wformat-y2k -Wimport -Winvalid-pch -Wmissing-include-dirs -Wmultichar -Wpragmas -Wredundant-decls -Wundef -Wunused-macros -Wvariadic-macros -Winvalid-offsetof -Wnon-template-friend -Wpmf-conversions -Wstrict-null-sentinel';
    {
	$global{'data'} .= 'export CXXFLAGS_WARNING_SERVER_SIMPLE	= ';

	$global{'data'} .= "$common_4_2_0 " if isClang() or CompilerIsSupport($global{'compiler_version'}, 4, 2, 0);
	$global{'data'} .= "$common\n";
    }

    {
	$global{'data'} .= 'export CXXFLAGS_WARNING_SERVER_NORMAL	= ';

	$global{'data'} .= "$common_4_2_0 " if isClang() or CompilerIsSupport($global{'compiler_version'}, 4, 2, 0);
	$global{'data'} .= "$common\n";
    }

    {
	$global{'data'} .= 'export CXXFLAGS_WARNING_SERVER_HAIRY	= ';

	$global{'data'} .= "$common_4_2_0 " if isClang() or CompilerIsSupport($global{'compiler_version'}, 4, 2, 0);
	$global{'data'} .= "$common\n";
    }

    {
	$global{'data'} .= "export CXXFLAGS_WARNING_TOOL		= ";

	$global{'data'} .= "$common_4_2_0 " if isClang() or CompilerIsSupport($global{'compiler_version'}, 4, 2, 0);
	$global{'data'} .= "$common\n";
    }
}

if (defined($global_options{'enable-google-japanese-input'})) {
    print "************************************\n";
    print "** enable google japanese input ! **\n";
    print "**     enable google suggest !    **\n" if defined $global_options{'enable-google-suggest'};
    print "************************************\n";
} else {
    if (defined($global_options{'enable-google-suggest'})) {
	die "illegal options --enable-google-suggest";
    }
}

{
    open(my $wfh, '>', 'Makefile.config') or die;
    print $wfh $global{'data'};
}