openssl/Configure

#! /usr/bin/env perl
# -*- mode: perl; -*-

##
##  Configure -- OpenSSL source tree configuration script
##  If editing this file, run this command before committing
##	make -f Makefile.in TABLE
##

require 5.000;
use strict;
use File::Basename;
use File::Spec::Functions;

# see INSTALL for instructions.

my $usage="Usage: Configure [no-<cipher> ...] [enable-<cipher> ...] [experimental-<cipher> ...] [-Dxxx] [-lxxx] [-Lxxx] [-fxxx] [-Kxxx] [no-hw-xxx|no-hw] [[no-]threads] [[no-]shared] [[no-]zlib|zlib-dynamic] [no-asm] [no-dso] [no-egd] [sctp] [386] [--prefix=DIR] [--openssldir=OPENSSLDIR] [--with-xxx[=vvv]] [--config=FILE] os/compiler[:flags]\n";

# Options:
#
# --config      add the given configuration file, which will be read after
#               any "Configurations*" files that are found in the same
#               directory as this script.
# --prefix      prefix for the OpenSSL installation, which includes the
#               directories bin, lib, include, share/man, share/doc/openssl
#               This becomes the value of INSTALLTOP in Makefile
#               (Default: /usr/local)
# --openssldir  OpenSSL data area, such as openssl.cnf, certificates and keys.
#               If it's a relative directory, it will be added on the directory
#               given with --prefix.
#               This becomes the value of OPENSSLDIR in Makefile and in C.
#               (Default: PREFIX/ssl)
#
# --install_prefix  Additional prefix for package builders (empty by
#               default).  This needn't be set in advance, you can
#               just as well use "make INSTALL_PREFIX=/whatever install".
#
# --cross-compile-prefix Add specified prefix to binutils components.
#
# --api         One of 0.9.8, 1.0.0 or 1.1.0.  Do not compile support for
#               interfaces deprecated as of the specified OpenSSL version.
#
# no-hw-xxx     do not compile support for specific crypto hardware.
#               Generic OpenSSL-style methods relating to this support
#               are always compiled but return NULL if the hardware
#               support isn't compiled.
# no-hw         do not compile support for any crypto hardware.
# [no-]threads  [don't] try to create a library that is suitable for
#               multithreaded applications (default is "threads" if we
#               know how to do it)
# [no-]shared	[don't] try to create shared libraries when supported.
# no-asm        do not use assembler
# no-dso        do not compile in any native shared-library methods. This
#               will ensure that all methods just return NULL.
# no-egd        do not compile support for the entropy-gathering daemon APIs
# [no-]zlib     [don't] compile support for zlib compression.
# zlib-dynamic	Like "zlib", but the zlib library is expected to be a shared
#		library and will be loaded in run-time by the OpenSSL library.
# sctp          include SCTP support
# 386           generate 80386 code
# no-sse2	disables IA-32 SSE2 code, above option implies no-sse2
# no-<cipher>   build without specified algorithm (rsa, idea, rc5, ...)
# -<xxx> +<xxx> compiler options are passed through
#
# DEBUG_SAFESTACK use type-safe stacks to enforce type-safety on stack items
#		provided to stack calls. Generates unique stack functions for
#		each possible stack type.
# DES_PTR	use pointer lookup vs arrays in the DES in crypto/des/des_locl.h
# DES_RISC1	use different DES_ENCRYPT macro that helps reduce register
#		dependancies but needs to more registers, good for RISC CPU's
# DES_RISC2	A different RISC variant.
# DES_UNROLL	unroll the inner DES loop, sometimes helps, somtimes hinders.
# DES_INT	use 'int' instead of 'long' for DES_LONG in crypto/des/des.h
#		This is used on the DEC Alpha where long is 8 bytes
#		and int is 4
# BN_LLONG	use the type 'long long' in crypto/bn/bn.h
# MD2_CHAR	use 'char' instead of 'int' for MD2_INT in crypto/md2/md2.h
# MD2_LONG	use 'long' instead of 'int' for MD2_INT in crypto/md2/md2.h
# IDEA_SHORT	use 'short' instead of 'int' for IDEA_INT in crypto/idea/idea.h
# IDEA_LONG	use 'long' instead of 'int' for IDEA_INT in crypto/idea/idea.h
# RC2_SHORT	use 'short' instead of 'int' for RC2_INT in crypto/rc2/rc2.h
# RC2_LONG	use 'long' instead of 'int' for RC2_INT in crypto/rc2/rc2.h
# RC4_CHAR	use 'char' instead of 'int' for RC4_INT in crypto/rc4/rc4.h
# RC4_LONG	use 'long' instead of 'int' for RC4_INT in crypto/rc4/rc4.h
# RC4_INDEX	define RC4_INDEX in crypto/rc4/rc4_locl.h.  This turns on
#		array lookups instead of pointer use.
# RC4_CHUNK	enables code that handles data aligned at long (natural CPU
#		word) boundary.
# RC4_CHUNK_LL	enables code that handles data aligned at long long boundary
#		(intended for 64-bit CPUs running 32-bit OS).
# BF_PTR	use 'pointer arithmatic' for Blowfish (unsafe on Alpha).
# BF_PTR2	intel specific version (generic version is more efficient).
#
# Following are set automatically by this script
#
# MD5_ASM	use some extra md5 assember,
# SHA1_ASM	use some extra sha1 assember, must define L_ENDIAN for x86
# RMD160_ASM	use some extra ripemd160 assember,
# SHA256_ASM	sha256_block is implemented in assembler
# SHA512_ASM	sha512_block is implemented in assembler
# AES_ASM	ASE_[en|de]crypt is implemented in assembler

# Minimum warning options... any contributions to OpenSSL should at least get
# past these.

my $gcc_devteam_warn = "-Wall -pedantic -DPEDANTIC -Wno-long-long -Wsign-compare -Wmissing-prototypes -Wshadow -Wformat -Wtype-limits -Werror -DREF_CHECK -DDEBUG_UNUSED";

# These are used in addition to $gcc_devteam_warn when the compiler is clang.
# TODO(openssl-team): fix problems and investigate if (at least) the
# following warnings can also be enabled:
# -Wswitch-enum, -Wunused-macros, -Wmissing-field-initializers,
# -Wcast-align,
# -Wunreachable-code -Wunused-parameter -Wlanguage-extension-token
# -Wextended-offsetof
my $clang_devteam_warn = "-Wno-unused-parameter -Wno-missing-field-initializers -Wno-language-extension-token -Wno-extended-offsetof -Wconditional-uninitialized -Qunused-arguments -Wincompatible-pointer-types-discards-qualifiers -Wmissing-variable-declarations";

# Warn that "make depend" should be run?
my $warn_make_depend = 0;

# These are used in addition to $gcc_devteam_warn unless this is a mingw build.
# This adds backtrace information to the memory leak info.
my $memleak_devteam_backtrace = "-rdynamic -DCRYPTO_MDEBUG_BACKTRACE";


my $strict_warnings = 0;

my $x86_gcc_des="DES_PTR DES_RISC1 DES_UNROLL";

# MD2_CHAR slags pentium pros
my $x86_gcc_opts="RC4_INDEX MD2_INT";

# As for $BSDthreads. Idea is to maintain "collective" set of flags,
# which would cover all BSD flavors. -pthread applies to them all,
# but is treated differently. OpenBSD expands is as -D_POSIX_THREAD
# -lc_r, which is sufficient. FreeBSD 4.x expands it as -lc_r,
# which has to be accompanied by explicit -D_THREAD_SAFE and
# sometimes -D_REENTRANT. FreeBSD 5.x expands it as -lc_r, which
# seems to be sufficient?
my $BSDthreads="-pthread -D_THREAD_SAFE -D_REENTRANT";

#
# API compability name to version number mapping.
#
my $maxapi = "1.1.0";           # API for "no-deprecated" builds
my $apitable = {
    "1.1.0" => "0x10100000L",
    "1.0.0" => "0x10000000L",
    "0.9.8" => "0x00908000L",
};

my $base_target = "BASE";   # The template that all other inherit from
our %table = ();
our %config = ();

# Forward declarations ###############################################

# read_config(filename)
#
# Reads a configuration file and populates %table with the contents
# (which the configuration file places in %targets).
sub read_config;

# resolve_config(target)
#
# Resolves all the late evalutations, inheritances and so on for the
# chosen target and any target it inherits from.
sub resolve_config;


# Information collection #############################################

# Collect version numbers
$config{version} = "unknown";
$config{version_num} = "unknown";
$config{shlib_version_number} = "unknown";
$config{shlib_version_history} = "unknown";

collect_information(
    '<include/openssl/opensslv.h',
    undef,
    qr/OPENSSL.VERSION.TEXT.*OpenSSL (\S+) / => sub { $config{version} = $1; },
    qr/OPENSSL.VERSION.NUMBER.*(0x\S+)/	     => sub { $config{version_num}=$1 },
    qr/SHLIB_VERSION_NUMBER *"([^"]+)"/	     => sub { $config{shlib_version_number}=$1 },
    qr/SHLIB_VERSION_HISTORY *"([^"]*)"/     => sub { $config{shlib_version_history}=$1 }
    );
if ($config{shlib_version_history} ne "") { $config{shlib_version_history} .= ":"; }

($config{major}, $config{minor})
    = ($config{version} =~ /^([0-9]+)\.([0-9\.]+)/);
($config{shlib_major}, $config{shlib_minor})
    = ($config{shlib_version_number} =~ /^([0-9]+)\.([0-9\.]+)/);
die "erroneous version information in opensslv.h: ",
    "$config{major}, $config{minor}, $config{shlib_major}, $config{shlib_minor}\n"
    if ($config{major} eq "" || $config{minor} eq ""
	|| $config{shlib_major} eq "" ||  $config{shlib_minor} eq "");

# Collect target configurations

my ($vol, $dir, $dummy) = File::Spec->splitpath($0);
my $pattern = File::Spec->catpath($vol, $dir, "Configurations/*.conf");
foreach (sort glob($pattern) ) {
    &read_config($_);
}


print "Configuring OpenSSL version $config{version} (0x$config{version_num})\n";

$config{perl};
$config{prefix}="";
$config{openssldir}="";
$config{processor}="";
$config{libdir}="";
$config{install_prefix}= "$ENV{'INSTALL_PREFIX'}";
$config{cross_compile_prefix}="";
$config{fipslibdir}="/usr/local/ssl/fips-2.0/lib/";
my $nofipscanistercheck=0;
$config{baseaddr}="0xFB00000";
my $no_threads=0;
my $threads=0;
$config{no_shared}=0; # but "no-shared" is default
my $zlib=1;      # but "no-zlib" is default
my $no_rfc3779=0;
my $no_asm=0;
my $no_dso=0;
my $Makefile="Makefile";
my $default_ranlib;
$config{fips}=0;

# Top level directories to build
$config{dirs} = [ "crypto", "ssl", "engines", "apps", "test", "tools" ];
# crypto/ subdirectories to build
$config{sdirs} = [
    "objects",
    "md2", "md4", "md5", "sha", "mdc2", "hmac", "ripemd", "whrlpool", "poly1305",
    "des", "aes", "rc2", "rc4", "rc5", "idea", "bf", "cast", "camellia", "seed", "chacha", "modes",
    "bn", "ec", "rsa", "dsa", "dh", "dso", "engine",
    "buffer", "bio", "stack", "lhash", "rand", "err",
    "evp", "asn1", "pem", "x509", "x509v3", "conf", "txt_db", "pkcs7", "pkcs12", "comp", "ocsp", "ui",
    "cms", "ts", "jpake", "srp", "store", "cmac", "ct", "async", "kdf"
    ];

# Known TLS and DTLS protocols
my @tls = qw(ssl3 tls1 tls1_1 tls1_2);
my @dtls = qw(dtls1 dtls1_2);

# Explicitelly known options that are possible to disable.  They can
# be regexps, and will be used like this: /^no-${option}$/
# For developers: keep it sorted alphabetically

my @disablables = (
    "aes",
    "asm",
    "bf",
    "camellia",
    "capieng",
    "cast",
    "chacha",
    "cmac",
    "cms",
    "comp",
    "crypto-mdebug",
    "ct",
    "deprecated",
    "des",
    "dgram",
    "dh",
    "dsa",
    "dso",
    "dtls",
    "dynamic[-_]engine",
    "ec",
    "ec2m",
    "ecdh",
    "ecdsa",
    "ec_nistp_64_gcc_128",
    "engine",
    "err",			# Really???
    "gost",
    "heartbeats",
    "hmac",
    "hw(-.+)?",
    "idea",
    "jpake",
    "locking",			# Really???
    "md2",
    "md4",
    "md5",
    "mdc2",
    "md[-_]ghost94",
    "nextprotoneg",
    "ocb",
    "ocsp",
    "poly1305",
    "posix-io",
    "psk",
    "rc2",
    "rc4",
    "rc5",
    "rdrand",
    "rfc3779",
    "rijndael",			# Old AES name
    "rmd160",
    "rsa",
    "scrypt",
    "sct",
    "sctp",
    "seed",
    "sha",
    "shared",
    "sock",
    "srp",
    "srtp",
    "sse2",
    "ssl",
    "ssl-trace",
    "static-engine",
    "stdio",
    "store",
    "threads",
    "tls",
    "unit-test",
    "whirlpool",
    "zlib",
    "zlib-dynamic",
    );
foreach my $proto ((@tls, @dtls))
	{
	push(@disablables, $proto);
	push(@disablables, "$proto-method");
	}

# All of the following is disabled by default (RC5 was enabled before 0.9.8):

my %disabled = ( # "what"         => "comment" [or special keyword "experimental"]
		 "ec_nistp_64_gcc_128" => "default",
		 "egd"            => "default",
		 "jpake"          => "experimental",
		 "md2"            => "default",
		 "rc5"            => "default",
		 "sctp"           => "default",
		 "shared"         => "default",
		 "ssl-trace"	  => "default",
		 "store"	  => "experimental",
		 "unit-test"	  => "default",
		 "zlib"           => "default",
		 "zlib-dynamic"   => "default",
		 "crypto-mdebug"  => "default",
	       );
my @experimental = ();

# Note: => pair form used for aesthetics, not to truly make a hash table
my @disable_cascades = (
    # "what"		=> [ "cascade", ... ]
    sub { $config{processor} eq "386" }
			=> [ "sse2" ],
    "ssl"		=> [ "ssl3" ],
    "ssl3-method"	=> [ "ssl3" ],
    "zlib"		=> [ "zlib-dynamic" ],
    "rijndael"		=> [ "aes" ],
    "des"		=> [ "mdc2" ],
    "ec"		=> [ "ecdsa", "ecdh", "gost" ],
    "dsa"		=> [ "gost" ],
    "dh"		=> [ "gost" ],
    "psk"		=> [ "jpake" ],

    "dgram"		=> [ "dtls" ],
    "dtls"		=> [ @dtls ],

    # SSL 3.0, (D)TLS 1.0 and TLS 1.1 require MD5 and SHA
    "md5"		=> [ "ssl", "tls1", "tls1_1", "dtls1" ],
    "sha"		=> [ "ssl", "tls1", "tls1_1", "dtls1" ],

    # Additionally, SSL 3.0 requires either RSA or DSA+DH
    sub { $disabled{rsa}
	  && ($disabled{dsa} || $disabled{dh}); }
			=> [ "ssl" ],

    # (D)TLS 1.0 and TLS 1.1 also require either RSA or DSA+DH
    # or ECDSA + ECDH.  (D)TLS 1.2 has this requirement as well.
    # (XXX: We don't support PSK-only builds).
    sub { $disabled{rsa}
	  && ($disabled{dsa} || $disabled{dh})
	  && ($disabled{ecdsa} || $disabled{ecdh}); }
			=> [ "tls1", "tls1_1", "tls1_2",
			     "dtls1", "dtls1_2" ],

    "tls"		=> [ @tls ],

    # SRP and HEARTBEATS require TLSEXT
    "tlsext"		=> [ "srp", "heartbeats" ],
    );

# Avoid protocol support holes.  Also disable all versions below N, if version
# N is disabled while N+1 is enabled.
#
my @list = (reverse @tls);
while ((my $first, my $second) = (shift @list, shift @list)) {
    last unless @list;
    push @disable_cascades, ( sub { !$disabled{$first} && $disabled{$second} }
			      => [ @list ] );
    unshift @list, $second;
}
my @list = (reverse @dtls);
while ((my $first, my $second) = (shift @list, shift @list)) {
    last unless @list;
    push @disable_cascades, ( sub { !$disabled{$first} && $disabled{$second} }
			      => [ @list ] );
    unshift @list, $second;
}

# Construct the string of what $config{depflags} should look like with the defaults
# from %disabled above.  (we need this to see if we should advise the user
# to run "make depend"):
my $default_depflags = join(" ",
    map { my $x = $_; $x =~ tr{[a-z]-}{[A-Z]_}; "-DOPENSSL_NO_$x"; }
    grep { $disabled{$_} !~ /\(no-depflags\)$/ }
    sort keys %disabled);

# Explicit "no-..." options will be collected in %disabled along with the defaults.
# To remove something from %disabled, use "enable-foo" (unless it's experimental).
# For symmetry, "disable-foo" is a synonym for "no-foo".

# For features called "experimental" here, a more explicit "experimental-foo" is needed to enable.
# We will collect such requests in @experimental.
# To avoid accidental use of experimental features, applications will have to use -DOPENSSL_EXPERIMENTAL_FOO.


my $no_sse2=0;

&usage if ($#ARGV < 0);

my $flags="";
$config{depflags}="";
$config{openssl_experimental_defines}=[];
$config{openssl_api_defines}=[];
$config{openssl_algorithm_defines}=[];
$config{openssl_thread_defines}=[];
$config{openssl_sys_defines}=[];
$config{openssl_other_defines}=[];
my $libs="";
my $target="";
$config{options}="";
my $make_depend=0;
my %withargs=();
my $build_prefix = "release_";

my @argvcopy=@ARGV;

if (grep /^reconf(igure)?$/, @argvcopy) {
    if (-f "./configdata.pm") {
	my $file = "./configdata.pm";
	unless (my $return = do $file) {
	    die "couldn't parse $file: $@" if $@;
            die "couldn't do $file: $!"    unless defined $return;
            die "couldn't run $file"       unless $return;
	}

	@argvcopy = defined($configdata::config{perlargv}) ?
	    @{$configdata::config{perlargv}} : ();
	die "Incorrect data to reconfigure, please do a normal configuration\n"
	    if (grep(/^reconf/,@argvcopy));
	$ENV{CROSS_COMPILE} = $configdata::config{cross_compile_prefix}
	    if defined($configdata::config{cross_compile_prefix});
	$ENV{CROSS_COMPILE} = $configdata::config{cc}
	    if defined($configdata::config{cc});

	print "Reconfiguring with: ", join(" ",@argvcopy), "\n";
	print "    CROSS_COMPILE = ",$ENV{CROSS_COMPILE},"\n"
	    if $ENV{CROSS_COMPILE};
	print "    CC = ",$ENV{CC},"\n" if $ENV{CC};
    } elsif (open IN, "<Makefile") {
        #
        # THIS SECTION IS TEMPORARY, it helps transitioning from Makefile
        # centered information gathering the reading configdata.pm
        #
        while (<IN>) {
            chomp;
            if (/^CONFIGURE_ARGS=\s*(.*)\s*/) {
                # Older form, we split the string and hope for the best
                @argvcopy = split /\s+/, $_;
                die "Incorrect data to reconfigure, please do a normal configuration\n"
                    if (grep(/^reconf/,@argvcopy));
            } elsif (/^CROSS_COMPILE=\s*(.*)/) {
                $ENV{CROSS_COMPILE}=$1;
            } elsif (/^CC=\s*(?:\$\(CROSS_COMPILE\))?(.*?)$/) {
                $ENV{CC}=$1;
            }
        }
        #
        # END OF TEMPORARY SECTION
        #
    } else {
	die "Insufficient data to reconfigure, please do a normal configuration\n";
    }
}

$config{perlargv} = [ @argvcopy ];

my %unsupported_options = ();
foreach (@argvcopy)
	{
	s /^-no-/no-/; # some people just can't read the instructions

	# rewrite some options in "enable-..." form
	s /^-?-?shared$/enable-shared/;
	s /^sctp$/enable-sctp/;
	s /^threads$/enable-threads/;
	s /^zlib$/enable-zlib/;
	s /^zlib-dynamic$/enable-zlib-dynamic/;

        if (/^(no|disable|enable|experimental)-(.+)$/)
		{
		my $word = $2;
		if (!grep { $word =~ /^${_}$/ } @disablables)
			{
			$unsupported_options{$_} = 1;
			next;
			}
		}
	if (/^no-(.+)$/ || /^disable-(.+)$/)
		{
		if (!($disabled{$1} eq "experimental"))
			{
			foreach my $proto ((@tls, @dtls))
				{
				if ($1 eq "$proto-method")
					{
					$disabled{"$proto"} = "option($proto-method)";
					last;
					}
				}
			if ($1 eq "dtls")
				{
                                foreach my $proto (@dtls)
					{
					$disabled{$proto} = "option(dtls)";
					}
				}
			elsif ($1 eq "ssl")
				{
				# Last one of its kind
				$disabled{"ssl3"} = "option(ssl)";
				}
			elsif ($1 eq "tls")
				{
                                # XXX: Tests will fail if all SSL/TLS
                                # protocols are disabled.
                                foreach my $proto (@tls)
					{
					$disabled{$proto} = "option(tls)";
					}
				}
			else
				{
				$disabled{$1} = "option";
				}
			}
		}
	elsif (/^enable-(.+)$/ || /^experimental-(.+)$/)
		{
		my $algo = $1;
		if ($disabled{$algo} eq "experimental")
			{
			die "You are requesting an experimental feature; please say 'experimental-$algo' if you are sure\n"
				unless (/^experimental-/);
			push @experimental, $algo;
			}
		delete $disabled{$algo};

		$threads = 1 if ($algo eq "threads");
		}
	elsif (/^--strict-warnings$/)
		{
		$strict_warnings = 1;
		}
	elsif (/^--debug$/)
		{
		$build_prefix = "debug_";
		}
	elsif (/^--release$/)
		{
		$build_prefix = "release_";
		}
	elsif (/^386$/)
		{ $config{processor}=386; }
	elsif (/^fips$/)
		{
		$config{fips}=1;
		}
	elsif (/^rsaref$/)
		{
		# No RSAref support any more since it's not needed.
		# The check for the option is there so scripts aren't
		# broken
		}
	elsif (/^nofipscanistercheck$/)
		{
		$config{fips} = 1;
		$nofipscanistercheck = 1;
		}
	elsif (/^[-+]/)
		{
		if (/^--prefix=(.*)$/)
			{
			$config{prefix}=$1;
			}
		elsif (/^--api=(.*)$/)
			{
			$config{api}=$1;
			}
		elsif (/^--libdir=(.*)$/)
			{
			$config{libdir}=$1;
			}
		elsif (/^--openssldir=(.*)$/)
			{
			$config{openssldir}=$1;
			}
		elsif (/^--install.prefix=(.*)$/)
			{
			$config{install_prefix}=$1;
			}
		elsif (/^--with-zlib-lib=(.*)$/)
			{
			$withargs{"zlib-lib"}=$1;
			}
		elsif (/^--with-zlib-include=(.*)$/)
			{
			$withargs{"zlib-include"}="-I$1";
			}
		elsif (/^--with-fipslibdir=(.*)$/)
			{
			$config{fipslibdir}="$1/";
			}
		elsif (/^--with-baseaddr=(.*)$/)
			{
			$config{baseaddr}="$1";
			}
		elsif (/^--cross-compile-prefix=(.*)$/)
			{
			$config{cross_compile_prefix}=$1;
			}
		elsif (/^--config=(.*)$/)
			{
			read_config $1;
			}
		elsif (/^-[lL](.*)$/ or /^-Wl,/)
			{
			$libs.=$_." ";
			}
		else	# common if (/^[-+]/), just pass down...
			{
			$_ =~ s/%([0-9a-f]{1,2})/chr(hex($1))/gei;
			$flags.=$_." ";
			}
		}
	elsif ($_ =~ /^([^:]+):(.+)$/)
		{
		eval "\$table{\$1} = \"$2\""; # allow $xxx constructs in the string
		$target=$1;
		}
	else
		{
		die "target already defined - $target (offending arg: $_)\n" if ($target ne "");
		$target=$_;
		}
	unless ($_ eq $target || /^no-/ || /^disable-/)
		{
		# "no-..." follows later after implied disactivations
		# have been derived.  (Don't take this too seroiusly,
		# we really only write OPTIONS to the Makefile out of
		# nostalgia.)

		if ($config{options} eq "")
			{ $config{options} = $_; }
		else
			{ $config{options} .= " ".$_; }
		}

        if (defined($config{api}) && !exists $apitable->{$config{api}}) {
		die "***** Unsupported api compatibility level: $config{api}\n",
        }

	if (keys %unsupported_options)
		{
		die "***** Unsupported options: ",
			join(", ", keys %unsupported_options), "\n";
		}
	}

if ($config{fips})
	{
	delete $disabled{"shared"} if ($disabled{"shared"} =~ /^default/);
	}
else
	{
	@{$config{dirs}} = grep !/^fips$/, @{$config{dirs}};
	}

my @tocheckfor = (keys %disabled);
while (@tocheckfor) {
    my %new_tocheckfor = ();
    my @cascade_copy = (@disable_cascades);
    while (@cascade_copy) {
	my ($test, $descendents) = (shift @cascade_copy, shift @cascade_copy);
	if (ref($test) eq "CODE" ? $test->() : defined($disabled{$test})) {
	    map {
		$new_tocheckfor{$_} => 1; $disabled{$_} = "forced";
	    } grep { !defined($disabled{$_}) } @$descendents;
	}
    }
    @tocheckfor = (keys %new_tocheckfor);
}

if ($target eq "TABLE") {
    foreach (sort keys %table) {
	print_table_entry($_, "TABLE");
    }
    exit 0;
}

if ($target eq "LIST") {
    foreach (sort keys %table) {
	print $_,"\n" unless $table{$_}->{template};
    }
    exit 0;
}

if ($target eq "HASH") {
    print "%table = (\n";
    foreach (sort keys %table) {
	print_table_entry($_, "HASH");
    }
    exit 0;
}

# Backward compatibility?
if ($target =~ m/^CygWin32(-.*)$/) {
    $target = "Cygwin".$1;
}

foreach (sort (keys %disabled))
	{
	$config{options} .= " no-$_";

	printf "    no-%-12s %-10s", $_, "[$disabled{$_}]";

	if (/^dso$/)
		{ $no_dso = 1; }
	elsif (/^threads$/)
		{ $no_threads = 1; }
	elsif (/^shared$/)
		{ $config{no_shared} = 1; }
	elsif (/^zlib$/)
		{ $zlib = 0; }
	elsif (/^static-engine$/)
		{ }
	elsif (/^zlib-dynamic$/)
		{ }
	elsif (/^sse2$/)
		{ $no_sse2 = 1; }
	elsif (/^engine$/)
		{ @{$config{dirs}} = grep !/^engine$/, @{$config{dirs}}; }
	elsif (/^gost$/)
		{ @{$config{engdirs}} = grep !/^ccgost$/, @{$config{engdirs}}; }
	else
		{
		my ($ALGO, $algo);
		($ALGO = $algo = $_) =~ tr/[\-a-z]/[_A-Z]/;

		if (/^asm$/ || /^err$/ || /^hw$/ || /^hw-/)
			{
			push @{$config{openssl_other_defines}}, "OPENSSL_NO_$ALGO";
			print " OPENSSL_NO_$ALGO";

			if (/^err$/)	{ $flags .= "-DOPENSSL_NO_ERR "; }
			elsif (/^asm$/)	{ $no_asm = 1; }
			}
		else
			{
			($ALGO,$algo) = ("RMD160","rmd160") if ($algo eq "ripemd");

			push @{$config{openssl_algorithm_defines}}, "OPENSSL_NO_$ALGO";
			$config{depflags} .= " -DOPENSSL_NO_$ALGO";
			print " OPENSSL_NO_$ALGO";

			# fix-up crypto/directory name(s)
			$algo="whrlpool" if $algo eq "whirlpool";
			$algo="ripemd" if $algo eq "rmd160";
			@{$config{sdirs}} = grep { $_ ne $algo} @{$config{sdirs}};

			print " (skip dir)";
			}
		}

	print "\n";
	}

my $exp_cflags = "";

foreach (sort @experimental)
	{
	my $ALGO;
	($ALGO = $_) =~ tr/[a-z]/[A-Z]/;

	# opensslconf.h will set OPENSSL_NO_... unless OPENSSL_EXPERIMENTAL_... is defined
	push @{$config{openssl_experimental_defines}}, "OPENSSL_NO_$ALGO";
	$exp_cflags .= " -DOPENSSL_EXPERIMENTAL_$ALGO";
	}

print "Configuring for $target\n";

# Support for legacy targets having a name starting with 'debug-'
my ($d, $t) = $target =~ m/^(debug-)?(.*)$/;
if ($d) {
    $build_prefix = "debug_";

    # If we do not find debug-foo in the table, the target is set to foo.
    if (!$table{$target}) {
	$target = $t;
    }
}
$config{target} = $target;
delete $table{$base_target}->{template}; # or the next test will fail.
my %target = ( %{$table{$base_target}}, resolve_config($target) );

&usage if (!%target || $target{template});

$target{exe_extension}="";
$target{exe_extension}=".exe" if ($config{target} eq "Cygwin" || $config{target} eq "DJGPP" || $config{target} =~ /^mingw/);
$target{exe_extension}=".nlm" if ($config{target} =~ /netware/);
$target{exe_extension}=".pm"  if ($config{target} =~ /vos/);

$default_ranlib	= which("ranlib") || "true";
$config{perl}	= $ENV{'PERL'} || which("perl5") || which("perl") || "perl";
my $make	= $ENV{'MAKE'} || "make";

$config{cross_compile_prefix} = $ENV{'CROSS_COMPILE'}
    if $config{cross_compile_prefix} eq "";

$config{prefix} = "/usr/local" if !$config{prefix};
$config{openssldir} = "ssl" if !$config{openssldir};
$config{openssldir} = catdir($config{prefix}, $config{openssldir})
    unless file_name_is_absolute($config{openssldir});

# Allow environment CC to override compiler...
$target{cc} = $ENV{CC} || $target{cc};

# For cflags and lflags, add the debug_ or release_ attributes
# Do it in such a way that no spurious space is appended (hence the grep).
$config{cflags} = join(" ",
		       grep { $_ ne "" } ($target{cflags},
					  $target{$build_prefix."cflags"}));
$config{lflags} = join(" ",
		       grep { $_ ne "" } ($target{lflags},
					  $target{$build_prefix."lflags"}));

$target{ranlib} = $ENV{'RANLIB'} || $target{ranlib} || $default_ranlib;
$target{ar} = $ENV{'AR'} || "ar";
$target{arflags} = "" if !defined($target{arflags});
$target{nm} = "nm";
# Make sure build_scheme is consistent.
$target{build_scheme} = [ $target{build_scheme} ]
    if ref($target{build_scheme}) ne "ARRAY";

# if $config{prefix}/lib$target{multilib} is not an existing directory, then
# assume that it's not searched by linker automatically, in
# which case adding $target{multilib} suffix causes more grief than
# we're ready to tolerate, so don't...
$target{multilib}="" if !-d "$config{prefix}/lib$target{multilib}";

$config{libdir}="lib$target{multilib}" if $config{libdir} eq "";
$config{enginesdir}=$config{prefix} . "/" . $config{libdir}  . "/engines";

$config{cflags} .= "$exp_cflags";

# '%' in $config{lflags} is used to split flags to "pre-" and post-flags
my ($pre,$post)=split('%',$config{lflags});
if (defined($post))	{ $config{prelflags}=$pre; $config{lflags}=$post;	}
else			{ $config{prelflags}="";   $config{lflags}=$pre;	}

if ($target =~ /^mingw/ && `$target{cc} --target-help 2>&1` !~ m/-mno-cygwin/m)
	{
	$config{cflags} =~ s/-mno-cygwin\s*//;
	$target{shared_ldflag} =~ s/-mno-cygwin\s*//;
	}

if ($target =~ /linux.*-mips/ && !$no_asm && $flags !~ /-m(ips|arch=)/) {
	# minimally required architecture flags for assembly modules
	$config{cflags}="-mips2 $config{cflags}" if ($target =~ /mips32/);
	$config{cflags}="-mips3 $config{cflags}" if ($target =~ /mips64/);
}

my $no_shared_warn=0;
my $no_user_cflags=0;

if ($flags ne "")	{ $config{cflags}="$flags$config{cflags}"; }
else			{ $no_user_cflags=1;       }

# The DSO code currently always implements all functions so that no
# applications will have to worry about that from a compilation point
# of view. However, the "method"s may return zero unless that platform
# has support compiled in for them. Currently each method is enabled
# by a define "DSO_<name>" ... we translate the "dso_scheme" config
# string entry into using the following logic;
my $dso_cflags;
if (!$no_dso && $target{dso_scheme} ne "")
	{
	$target{dso_scheme} =~ tr/[a-z]/[A-Z]/;
	if ($target{dso_scheme} eq "DLFCN")
		{
		$dso_cflags = "-DDSO_DLFCN -DHAVE_DLFCN_H";
		}
	elsif ($target{dso_scheme} eq "DLFCN_NO_H")
		{
		$dso_cflags = "-DDSO_DLFCN";
		}
	else
		{
		$dso_cflags = "-DDSO_$target{dso_scheme}";
		}
	$config{cflags} = "$dso_cflags $config{cflags}";
	}

my $thread_cflags;
my @thread_defines;
if ($target{thread_cflag} ne "(unknown)" && !$no_threads)
	{
	# If we know how to do it, support threads by default.
	$threads = 1;
	}
if ($target{thread_cflag} eq "(unknown)" && $threads)
	{
	# If the user asked for "threads", [s]he is also expected to
	# provide any system-dependent compiler options that are
	# necessary.
	if ($no_user_cflags)
		{
		print "You asked for multi-threading support, but didn't\n";
		print "provide any system-specific compiler options\n";
		exit(1);
		}
	$thread_cflags="-DOPENSSL_THREADS $config{cflags}" ;
	push @thread_defines, "OPENSSL_THREADS";
	}
else
	{
	$thread_cflags="-DOPENSSL_THREADS $target{thread_cflag} $config{cflags}";
	push @thread_defines, "OPENSSL_THREADS";
#	my $def;
#	foreach $def (split ' ',$target{thread_cflag})
#		{
#		if ($def =~ s/^-D// && $def !~ /^_/)
#			{
#			push @thread_defines, "$def";
#			}
#		}
	}

$config{lflags}="$libs$config{lflags}" if ($libs ne "");

if ($no_asm)
	{
	$config{cflags}=~s/-D[BL]_ENDIAN//		if ($config{fips});
	$thread_cflags=~s/-D[BL]_ENDIAN//	if ($config{fips});
	}

if ($threads)
	{
	$config{cflags}=$thread_cflags;
	push @{$config{openssl_thread_defines}}, @thread_defines;
	}

if ($zlib)
	{
	$config{cflags} = "-DZLIB $config{cflags}";
	if (defined($disabled{"zlib-dynamic"}))
		{
		if (defined($withargs{"zlib-lib"}))
			{
			$config{lflags} .= " -L" . $withargs{"zlib-lib"} . " -lz";
			}
		else
			{
			$config{lflags} .= " -lz";
			}
		}
	else
		{
		$config{cflags} = "-DZLIB_SHARED $config{cflags}";
		}
	}

# With "deprecated" disable all deprecated features.
if (defined($disabled{"deprecated"})) {
        $config{api} = $maxapi;
}

if ($target{shared_target} eq "")
	{
	$no_shared_warn = 1 if !$config{no_shared} && !$config{fips};
	$config{no_shared} = 1;
	}
if (!$config{no_shared})
	{
	if ($target{shared_cflag} ne "")
		{
		$config{cflags} = "$target{shared_cflag} -DOPENSSL_PIC $config{cflags}";
		}
	}

if ($target{build_scheme}->[0] ne "mk1mf")
	{
	# add {no-}static-engine to options to allow mkdef.pl to work without extra arguments
	if ($config{no_shared})
		{
		push @{$config{openssl_other_defines}}, "OPENSSL_NO_DYNAMIC_ENGINE";
		$config{options}.=" static-engine";
		}
	else
		{
		push @{$config{openssl_other_defines}}, "OPENSSL_NO_STATIC_ENGINE";
		$config{options}.=" no-static-engine";
		}
	}

#
# Platform fix-ups
#
if ($target =~ /-icc$/)	# Intel C compiler
	{
	my $iccver=0;
	if (open(FD,"$target{cc} -V 2>&1 |"))
		{
		while(<FD>) { $iccver=$1 if (/Version ([0-9]+)\./); }
		close(FD);
		}
	if ($iccver>=8)
		{
		$config{cflags}=~s/-KPIC/-fPIC/;
		# Eliminate unnecessary dependency from libirc.a. This is
		# essential for shared library support, as otherwise
		# apps/openssl can end up in endless loop upon startup...
		$config{cflags}.=" -Dmemcpy=__builtin_memcpy -Dmemset=__builtin_memset";
		}
	if ($iccver>=9)
		{
		$config{lflags}.=" -i-static";
		$config{lflags}=~s/-no_cpprt/-no-cpprt/;
		}
	if ($iccver>=10)
		{
		$config{lflags}=~s/-i-static/-static-intel/;
		}
	if ($iccver>=11)
		{
		$config{cflags}.=" -no-intel-extensions";	# disable Cilk
		$config{lflags}=~s/-no-cpprt/-no-cxxlib/;
		}
	}

# Unlike other OSes (like Solaris, Linux, Tru64, IRIX) BSD run-time
# linkers (tested OpenBSD, NetBSD and FreeBSD) "demand" RPATH set on
# .so objects. Apparently application RPATH is not global and does
# not apply to .so linked with other .so. Problem manifests itself
# when libssl.so fails to load libcrypto.so. One can argue that we
# should engrave this into Makefile.shared rules or into BSD-* config
# lines above. Meanwhile let's try to be cautious and pass -rpath to
# linker only when --prefix is not /usr.
if ($target =~ /^BSD-/)
	{
	$target{shared_ldflag}.=" -Wl,-rpath,\$\$(LIBRPATH)" if ($config{prefix} !~ m|^/usr[/]*$|);
	}

if ($target{sys_id} ne "")
	{
	#$config{cflags}="-DOPENSSL_SYS_$target{sys_id} $config{cflags}";
	push @{$config{openssl_sys_defines}}, "OPENSSL_SYS_$target{sys_id}";
	}

if ($target{ranlib} eq "")
	{
	$target{ranlib} = $default_ranlib;
	}

if (!$no_asm) {
    $target{cpuid_obj}=$table{BASE}->{cpuid_obj} if ($config{processor} eq "386");
    $target{cpuid_obj}.=" uplink.o uplink-x86.o" if ($config{cflags} =~ /-DOPENSSL_USE_APPLINK/);

    $target{bn_obj} =~ s/\w+-gf2m.o// if (defined($disabled{ec2m}));

    # bn-586 is the only one implementing bn_*_part_words
    $config{cflags}.=" -DOPENSSL_BN_ASM_PART_WORDS" if ($target{bn_obj} =~ /bn-586/);
    $config{cflags}.=" -DOPENSSL_IA32_SSE2" if (!$no_sse2 && $target{bn_obj} =~ /86/);

    $config{cflags}.=" -DOPENSSL_BN_ASM_MONT" if ($target{bn_obj} =~ /-mont/);
    $config{cflags}.=" -DOPENSSL_BN_ASM_MONT5" if ($target{bn_obj} =~ /-mont5/);
    $config{cflags}.=" -DOPENSSL_BN_ASM_GF2m" if ($target{bn_obj} =~ /-gf2m/);

    if ($config{fips}) {
	push @{$config{openssl_other_defines}}, "OPENSSL_FIPS";
    }

    if ($target{sha1_obj} =~ /\.o$/) {
	$config{cflags}.=" -DSHA1_ASM"   if ($target{sha1_obj} =~ /sx86/ || $target{sha1_obj} =~ /sha1/);
	$config{cflags}.=" -DSHA256_ASM" if ($target{sha1_obj} =~ /sha256/);
	$config{cflags}.=" -DSHA512_ASM" if ($target{sha1_obj} =~ /sha512/);
	if ($target{sha1_obj} =~ /sse2/) {
	    if ($no_sse2) {
		$target{sha1_obj} =~ s/\S*sse2\S+//;
	    } elsif ($config{cflags} !~ /OPENSSL_IA32_SSE2/) {
		$config{cflags}.=" -DOPENSSL_IA32_SSE2";
	    }
	}
    }
    if ($target{md5_obj} =~ /\.o$/) {
	$config{cflags}.=" -DMD5_ASM";
    }
    $target{cast_obj}=$table{BASE}->{cast_obj} if (!$config{no_shared}); # CAST assembler is not PIC
    if ($target{rmd160_obj} =~ /\.o$/) {
	$config{cflags}.=" -DRMD160_ASM";
    }
    if ($target{aes_obj} =~ /\.o$/) {
	$config{cflags}.=" -DAES_ASM" if ($target{aes_obj} =~ m/\baes-/);;
	# aes-ctr.o is not a real file, only indication that assembler
	# module implements AES_ctr32_encrypt...
	$config{cflags}.=" -DAES_CTR_ASM" if ($target{aes_obj} =~ s/\s*aes-ctr\.o//);
	# aes-xts.o indicates presence of AES_xts_[en|de]crypt...
	$config{cflags}.=" -DAES_XTS_ASM" if ($target{aes_obj} =~ s/\s*aes-xts\.o//);
	$target{aes_obj} =~ s/\s*(vpaes|aesni)-x86\.o//g if ($no_sse2);
	$config{cflags}.=" -DVPAES_ASM" if ($target{aes_obj} =~ m/vpaes/);
	$config{cflags}.=" -DBSAES_ASM" if ($target{aes_obj} =~ m/bsaes/);
    }
    if ($target{wp_obj} =~ /mmx/ && $config{processor} eq "386") {
	$target{wp_obj}=$table{BASE}->{wp_obj};
    } elsif (!$disabled{"whirlpool"}) {
	$config{cflags}.=" -DWHIRLPOOL_ASM";
    }
    if ($target{modes_obj} =~ /ghash-/) {
	$config{cflags}.=" -DGHASH_ASM";
    }
    if ($target{ec_obj} =~ /ecp_nistz256/) {
	$config{cflags}.=" -DECP_NISTZ256_ASM";
    }
    if ($target{poly1305_obj} =~ /\.o$/) {
	$config{cflags}.=" -DPOLY1305_ASM";
    }
}

$config{makedepprog} = "makedepend";
if ($target{cc} eq "gcc" || ($target{cc} eq 'cc' && $config{target} =~ /darwin/)) {
    $config{makedepprog} = $target{cc};
}
# On different platforms, shared library suffixes takes interesting forms.
# On Most Unixen, it's .so.{version} or .sl.{version}, while on MacOS X,
# it's .{version}.dylib.  We're want to separate the two so we can calculate
# symlinks.
# FIXME: is this actually needed any more?  Makefile.shared seems to just
# symlink a file name without SOVER to the file with full SOVER, nothing in
# between.
if ($target{shared_extension} =~ /^(|(?<e>\.s[ol])(?<v>\..*)|(?<v>\..*)(?<e>\.dylib))$/) {
    my @vernums = split /\./, $+{v};
    shift @vernums;             # Because the initial period in shlib_extension.
    my @s = ();
    while (@vernums) {
	pop @vernums;
	push @s, join(".", $+{e} eq ".dylib" ? "" : $+{e},
		      @vernums,
		      $+{e} eq ".dylib" ? $+{e} : () );
    }
    $config{shared_link_extensions} = join(" ", @s);
} else {
    $config{shared_link_extensions} = "";
}
$config{depflags} =~ s/^\s*//;


# Deal with bn_ops ###################################################

$config{des_ptr}		=0;
$config{des_risc1}		=0;
$config{des_risc2}		=0;
$config{des_unroll}		=0;
$config{bn_ll}			=0;
$config{rc4_idx}		=0;
$config{bf_ptr}			=0;
$config{export_var_as_fn}	=0;
my $def_int="unsigned int";
$config{rc4_int}		=$def_int;
$config{rc4_chunk}		="";
$config{md2_int}		=$def_int;
$config{idea_int}		=$def_int;
$config{rc2_int}		=$def_int;
($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})=(0,0,1,0,0);

$config{des_int} = "unsigned long";

foreach (sort split(/\s+/,$target{bn_ops})) {
    $config{des_ptr}=1				if /DES_PTR/;
    $config{des_risc1}=1			if /DES_RISC1/;
    $config{des_risc2}=1			if /DES_RISC2/;
    $config{des_unroll}=1			if /DES_UNROLL/;
    $config{des_int}="unsigned int"		if /DES_INT/;
    $config{bn_ll}=1				if /BN_LLONG/;
    $config{rc4_int}="unsigned char"		if /RC4_CHAR/;
    $config{rc4_int}="unsigned long"		if /RC4_LONG/;
    $config{rc4_idx}=1				if /RC4_INDEX/;
    $config{rc4_chunk}="unsigned long"		if /RC4_CHUNK/;
    $config{rc4_chunk}="unsigned long long"	if /RC4_CHUNK_LL/;
    $config{md2_int}="unsigned char"		if /MD2_CHAR/;
    $config{md2_int}="unsigned long"		if /MD2_LONG/;
    $config{idea_int}="unsigned char"		if /IDEA_CHAR/;
    $config{idea_int}="unsigned long"		if /IDEA_LONG/;
    $config{rc2_int}="unsigned char"		if /RC2_CHAR/;
    $config{rc2_int}="unsigned long"		if /RC2_LONG/;
    $config{bf_ptr}=1				if $_ eq "BF_PTR";
    $config{bf_ptr}=2				if $_ eq "BF_PTR2";
    ($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})
	=(0,1,0,0,0)				if /SIXTY_FOUR_BIT/;
    ($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})
	=(1,0,0,0,0)				if /SIXTY_FOUR_BIT_LONG/;
    ($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})
	=(0,0,1,0,0)				if /THIRTY_TWO_BIT/;
    ($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})
	=(0,0,0,1,0)				if /SIXTEEN_BIT/;
    ($config{b64l},$config{b64},$config{b32},$config{b16},$config{b8})
	=(0,0,0,0,1)				if /EIGHT_BIT/;
    $config{export_var_as_fn}=1			if /EXPORT_VAR_AS_FN/;
}


# Hack cflags for better warnings (dev option) #######################

# "Stringify" the C flags string.  This permits it to be made part of a string
# and works as well on command lines.
$config{cflags} =~ s/([\\\"])/\\\1/g;

if (defined($config{api})) {
    $config{openssl_api_defines} = [ "OPENSSL_MIN_API=".$apitable->{$config{api}} ];
    my $apiflag = sprintf("-DOPENSSL_API_COMPAT=%s", $apitable->{$config{api}});
    $default_depflags .= " $apiflag";
    $config{cflags} .= " $apiflag";
}

my $ecc = $target{cc};
$ecc = "clang" if `$target{cc} --version 2>&1` =~ /clang/;

if ($strict_warnings)
	{
	my $wopt;
	die "ERROR --strict-warnings requires gcc or clang" unless ($ecc =~ /gcc(-\d(\.\d)*)?$/ or $ecc =~ /clang$/);
	foreach $wopt (split /\s+/, $gcc_devteam_warn)
		{
		$config{cflags} .= " $wopt" unless ($config{cflags} =~ /(^|\s)$wopt(\s|$)/)
		}
	if ($ecc eq "clang")
		{
		foreach $wopt (split /\s+/, $clang_devteam_warn)
			{
			$config{cflags} .= " $wopt" unless ($config{cflags} =~ /(^|\s)$wopt(\s|$)/)
			}
		}
	if ($target !~ /^mingw/)
		{
		foreach $wopt (split /\s+/, $memleak_devteam_backtrace)
			{
			$config{cflags} .= " $wopt" unless ($config{cflags} =~ /(^|\s)$wopt(\s|$)/)
			}
		if ($target =~ /^BSD-/)
			{
			$config{lflags} .= " -lexecinfo";
			}
		}
	}

# Write down our configuration where it fits #########################

open(OUT,">configdata.pm") || die "unable to create configdata.pm: $!\n";
print OUT <<"EOF";
package configdata;

use strict;
use warnings;

use Exporter;
#use vars qw(\@ISA \@EXPORT);
our \@ISA = qw(Exporter);
our \@EXPORT = qw(\%config \%target %withargs);

EOF
print OUT "our %config = (\n";
foreach (sort keys %config) {
    if (ref($config{$_}) eq "ARRAY") {
	print OUT "  ", $_, " => [ ", join(", ",
					   map { quotify("perl", $_) }
					   @{$config{$_}}), " ],\n";
    } else {
	print OUT "  ", $_, " => ", quotify("perl", $config{$_}), ",\n"
    }
}
print OUT <<"EOF";
);

EOF
print OUT "our %target = (\n";
foreach (sort keys %target) {
    if (ref($target{$_}) eq "ARRAY") {
	print OUT "  ", $_, " => [ ", join(", ",
					   map { quotify("perl", $_) }
					   @{$target{$_}}), " ],\n";
    } else {
	print OUT "  ", $_, " => ", quotify("perl", $target{$_}), ",\n"
    }
}
print OUT <<"EOF";
);

EOF
print OUT "our %withargs = (\n";
foreach (sort keys %withargs) {
    if (ref($withargs{$_}) eq "ARRAY") {
	print OUT "  ", $_, " => [ ", join(", ",
					   map { quotify("perl", $_) }
					   @{$withargs{$_}}), " ],\n";
    } else {
	print OUT "  ", $_, " => ", quotify("perl", $withargs{$_}), ",\n"
    }
}
print OUT <<"EOF";
);

1;
EOF
close(OUT);

print "IsMK1MF       =", ($target{build_scheme}->[0] eq "mk1mf" ? "yes" : "no"), "\n";
print "CC            =$target{cc}\n";
print "CFLAG         =$config{cflags}\n";
print "EX_LIBS       =$config{lflags}\n";
print "CPUID_OBJ     =$target{cpuid_obj}\n";
print "BN_ASM        =$target{bn_obj}\n";
print "EC_ASM        =$target{ec_obj}\n";
print "DES_ENC       =$target{des_obj}\n";
print "AES_ENC       =$target{aes_obj}\n";
print "BF_ENC        =$target{bf_obj}\n";
print "CAST_ENC      =$target{cast_obj}\n";
print "RC4_ENC       =$target{rc4_obj}\n";
print "RC5_ENC       =$target{rc5_obj}\n";
print "MD5_OBJ_ASM   =$target{md5_obj}\n";
print "SHA1_OBJ_ASM  =$target{sha1_obj}\n";
print "RMD160_OBJ_ASM=$target{rmd160_obj}\n";
print "CMLL_ENC      =$target{cmll_obj}\n";
print "MODES_OBJ     =$target{modes_obj}\n";
print "ENGINES_OBJ   =$target{engines_obj}\n";
print "CHACHA_ENC    =$target{chacha_obj}\n";
print "POLY1305_OBJ  =$target{poly1305_obj}\n";
print "PROCESSOR     =$config{processor}\n";
print "RANLIB        =$target{ranlib}\n";
print "ARFLAGS       =$target{arflags}\n";
print "PERL          =$config{perl}\n";

run_dofile("$Makefile.in","$Makefile.new");

run_dofile("include/openssl/opensslconf.h.in", "include/openssl/opensslconf.h");

run_dofile("include/openssl/opensslconf.h.in", "include/openssl/opensslconf.h");

foreach my $alg ( 'bf', 'bn', 'des', 'rc4' ) {
    run_dofile("crypto/include/internal/${alg}_conf.h.in",
	       "crypto/include/internal/${alg}_conf.h");
}

# Fix the date

print "SIXTY_FOUR_BIT_LONG mode\n" if $config{b64l};
print "SIXTY_FOUR_BIT mode\n" if $config{b64};
print "THIRTY_TWO_BIT mode\n" if $config{b32};
print "SIXTEEN_BIT mode\n" if $config{b16};
print "EIGHT_BIT mode\n" if $config{b8};
print "DES_PTR used\n" if $config{des_ptr};
print "DES_RISC1 used\n" if $config{des_risc1};
print "DES_RISC2 used\n" if $config{des_risc2};
print "DES_UNROLL used\n" if $config{des_unroll};
print "DES_INT used\n" if $config{des_int} =~ / int$/;
print "BN_LLONG mode\n" if $config{bn_ll};
print "RC4 uses $config{rc4_int}\n" if $config{rc4_int} != $def_int;
print "RC4_INDEX mode\n" if $config{rc4_idx};
print "RC4_CHUNK is undefined\n" unless $config{rc4_chunk};
print "RC4_CHUNK is $config{rc4_chunk}\n" if $config{rc4_chunk};
print "MD2 uses $config{md2_int}\n" if $config{md2_int} != $def_int;
print "IDEA uses $config{idea_int}\n" if $config{idea_int} != $def_int;
print "RC2 uses $config{rc2_int}\n" if $config{rc2_int} != $def_int;
print "BF_PTR used\n" if $config{bf_ptr} == 1;
print "BF_PTR2 used\n" if $config{bf_ptr} == 2;

# Copy all Makefile.in to Makefile (except top-level)
use File::Find;
use IO::File;
find(sub {
        return if ($_ ne "Makefile.in" || $File::Find::dir eq ".");
        my $in = IO::File->new($_, "r") or
            die sprintf "Error reading Makefile.in in %s: !$\n",
                $File::Find::dir;
        my $out = IO::File->new("Makefile", "w") or
            die sprintf "Error writing Makefile in %s: !$\n",
                $File::Find::dir;
        print $out "# Generated from $_, do not edit\n";
        while (my $line = <$in>) { print $out $line }
        $in->close() or
            die sprintf "Error reading Makefile.in in %s: !$\n",
                $File::Find::dir;
        $out->close() or
            die sprintf "Error writing Makefile in %s: !$\n",
                $File::Find::dir;
    }, ".");

my %builders = (
    unixmake => sub {
	my $make_command = "$make PERL=\'$config{perl}\'";
	my $make_targets = "";
	$make_targets .= " depend" if $config{depflags} ne $default_depflags && $make_depend;
	(system $make_command.$make_targets) == 0 or die "make $make_targets failed"
	    if $make_targets ne "";
	if ($config{depflags} ne $default_depflags && !$make_depend) {
            $warn_make_depend++;
        }
    },
    mk1mf => sub {
	open (OUT,">crypto/buildinf.h") || die "Can't open buildinf.h";
	printf OUT <<"EOF";
#ifndef MK1MF_BUILD
  /* auto-generated by Configure for crypto/cversion.c:
   * for Unix builds, crypto/Makefile.ssl generates functional definitions;
   * Windows builds (and other mk1mf builds) compile cversion.c with
   * -DMK1MF_BUILD and use definitions added to this file by util/mk1mf.pl. */
  #error "Windows builds (PLATFORM=$target) use mk1mf.pl-created Makefiles"
#endif
EOF
	close(OUT);

	# create the ms/version32.rc file if needed
	if (! grep /^netware/, @{$target{build_scheme}}) {
	    my ($v1, $v2, $v3, $v4);
	    if ($config{version_num} =~ /^0x([0-9a-f]{1})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{1})L$/i) {
		$v1=hex $1;
		$v2=hex $2;
		$v3=hex $3;
		$v4=hex $4;
	    }
	    open (OUT,">ms/version32.rc") || die "Can't open ms/version32.rc";
	    print OUT <<"EOF";
#include <winver.h>

LANGUAGE 0x09,0x01

1 VERSIONINFO
  FILEVERSION $v1,$v2,$v3,$v4
  PRODUCTVERSION $v1,$v2,$v3,$v4
  FILEFLAGSMASK 0x3fL
#ifdef _DEBUG
  FILEFLAGS 0x01L
#else
  FILEFLAGS 0x00L
#endif
  FILEOS VOS__WINDOWS32
  FILETYPE VFT_DLL
  FILESUBTYPE 0x0L
BEGIN
    BLOCK "StringFileInfo"
    BEGIN
	BLOCK "040904b0"
	BEGIN
	    // Required:
	    VALUE "CompanyName", "The OpenSSL Project, http://www.openssl.org/\\0"
	    VALUE "FileDescription", "OpenSSL Shared Library\\0"
	    VALUE "FileVersion", "$config{version}\\0"
#if defined(CRYPTO)
	    VALUE "InternalName", "libeay32\\0"
	    VALUE "OriginalFilename", "libeay32.dll\\0"
#elif defined(SSL)
	    VALUE "InternalName", "ssleay32\\0"
	    VALUE "OriginalFilename", "ssleay32.dll\\0"
#endif
	    VALUE "ProductName", "The OpenSSL Toolkit\\0"
	    VALUE "ProductVersion", "$config{version}\\0"
	    // Optional:
	    //VALUE "Comments", "\\0"
	    VALUE "LegalCopyright", "Copyright © 1998-2015 The OpenSSL Project. Copyright © 1995-1998 Eric A. Young, Tim J. Hudson. All rights reserved.\\0"
	    //VALUE "LegalTrademarks", "\\0"
	    //VALUE "PrivateBuild", "\\0"
	    //VALUE "SpecialBuild", "\\0"
	END
    END
    BLOCK "VarFileInfo"
    BEGIN
        VALUE "Translation", 0x409, 0x4b0
    END
END
EOF
	    close(OUT);
	}
    },
    );

my ($builder, @builder_opts) = @{$target{build_scheme}};
$builders{$builder}->(@builder_opts);

print <<"EOF";

Configured for $target.
EOF

print <<"EOF" if (!$no_threads && !$threads);

The library could not be configured for supporting multi-threaded
applications as the compiler options required on this system are not known.
See file INSTALL for details if you need multi-threading.
EOF

print <<"EOF" if ($no_shared_warn);

You gave the option 'shared', which is not supported on this platform, so
we will pretend you gave the option 'no-shared'.  If you know how to implement
shared libraries, please let us know (but please first make sure you have
tried with a current version of OpenSSL).
EOF

print <<"EOF" if ($warn_make_depend);

*** Because of configuration changes, you MUST do the following before
*** building:

	make depend
EOF

exit(0);

######################################################################
#
# Helpers and utility functions
#

# Configuration file reading #########################################

# Helper function to implement conditional inheritance depending on the
# value of $no_asm.  Used in inherit_from values as follows:
#
#      inherit_from => [ "template", asm("asm_tmpl") ]
#
sub asm {
    my @x = @_;
    sub {
	$no_asm ? () : @x;
    }
}

# Helper function to implement adding values to already existing configuration
# values.  It handles elements that are ARRAYs, CODEs and scalars
sub _add {
    my $separator = shift;

    # If there's any ARRAY in the collection of values, we will return
    # an ARRAY of combined values, otherwise a string of joined values
    # with $separator as the separator.
    my $found_array = 0;

    my @values =
	map {
	    if (ref($_) eq "ARRAY") {
		$found_array = 1;
		@$_;
	    } else {
		$_;
	    }
    } (@_);

    if ($found_array) {
	[ @values ];
    } else {
	join($separator, @values);
    }
}
sub add_before {
    my $separator = shift;
    my @x = @_;
    sub { _add($separator, @x, @_) };
}
sub add {
    my $separator = shift;
    my @x = @_;
    sub { _add($separator, @_, @x) };
}

# configuration reader, evaluates the input file as a perl script and expects
# it to fill %targets with target configurations.  Those are then added to
# %table.
sub read_config {
    my $fname = shift;
    open(CONFFILE, "< $fname")
	or die "Can't open configuration file '$fname'!\n";
    my $x = $/;
    undef $/;
    my $content = <CONFFILE>;
    $/ = $x;
    close(CONFFILE);
    my %targets = ();
    {
	local %table = %::table;    # Protect %table from tampering

	eval $content;
	warn $@ if $@;
    }

    # For each target, check that it's configured with a hash table.
    foreach (keys %targets) {
	if (ref($targets{$_}) ne "HASH") {
	    if (ref($targets{$_}) eq "") {
		warn "Deprecated target configuration for $_, ignoring...\n";
	    } else {
		warn "Misconfigured target configuration for $_ (should be a hash table), ignoring...\n";
	    }
	    delete $targets{$_};
	}
    }

    %table = (%table, %targets);

}

# configuration resolver.  Will only resolve all the lazy evalutation
# codeblocks for the chozen target and all those it inherits from,
# recursively
sub resolve_config {
    my $target = shift;
    my @breadcrumbs = @_;

    if (grep { $_ eq $target } @breadcrumbs) {
	die "inherit_from loop!  target backtrace:\n  "
	    ,$target,"\n  ",join("\n  ", @breadcrumbs),"\n";
    }

    if (!defined($table{$target})) {
	warn "Warning! target $target doesn't exist!\n";
	return ();
    }
    # Recurse through all inheritances.  They will be resolved on the
    # fly, so when this operation is done, they will all just be a
    # bunch of attributes with string values.
    # What we get here, though, are keys with references to lists of
    # the combined values of them all.  We will deal with lists after
    # this stage is done.
    my %combined_inheritance = ();
    if ($table{$target}->{inherit_from}) {
	my @inherit_from =
	    map { ref($_) eq "CODE" ? $_->() : $_ } @{$table{$target}->{inherit_from}};
	foreach (@inherit_from) {
	    my %inherited_config = resolve_config($_, $target, @breadcrumbs);

	    # 'template' is a marker that's considered private to
	    # the config that had it.
	    delete $inherited_config{template};

	    map {
		if (!$combined_inheritance{$_}) {
		    $combined_inheritance{$_} = [];
		}
		push @{$combined_inheritance{$_}}, $inherited_config{$_};
	    } keys %inherited_config;
	}
    }

    # We won't need inherit_from in this target any more, since we've
    # resolved all the inheritances that lead to this
    delete $table{$target}->{inherit_from};

    # Now is the time to deal with those lists.  Here's the place to
    # decide what shall be done with those lists, all based on the
    # values of the target we're currently dealing with.
    # - If a value is a coderef, it will be executed with the list of
    #   inherited values as arguments.
    # - If the corresponding key doesn't have a value at all or is the
    #   emoty string, the inherited value list will be run through the
    #   default combiner (below), and the result becomes this target's
    #   value.
    # - Otherwise, this target's value is assumed to be a string that
    #   will simply override the inherited list of values.
    my $default_combiner = add(" ");

    my %all_keys =
	map { $_ => 1 } (keys %combined_inheritance,
			 keys %{$table{$target}});
    foreach (sort keys %all_keys) {

	# Current target doesn't have a value for the current key?
	# Assign it the default combiner, the rest of this loop body
	# will handle it just like any other coderef.
	if (!exists $table{$target}->{$_}) {
	    $table{$target}->{$_} = $default_combiner;
	}

	my $valuetype = ref($table{$target}->{$_});
	if ($valuetype eq "CODE") {
	    # CODE reference, execute it with the inherited values as
	    # arguments.
	    $table{$target}->{$_} =
		$table{$target}->{$_}->(@{$combined_inheritance{$_}});
	} elsif ($valuetype eq "ARRAY" || $valuetype eq "") {
	    # ARRAY or Scalar, just leave it as is.
	} else {
	    # Some other type of reference that we don't handle.
	    # Better to abort at this point.
	    die "cannot handle reference type $valuetype,"
		," found in target $target -> $_\n";
	}
    }

    # Finally done, return the result.
    return %{$table{$target}};
}

sub usage
	{
	print STDERR $usage;
	print STDERR "\npick os/compiler from:\n";
	my $j=0;
	my $i;
        my $k=0;
	foreach $i (sort keys %table)
		{
		next if $table{$i}->{template};
		next if $i =~ /^debug/;
		$k += length($i) + 1;
		if ($k > 78)
			{
			print STDERR "\n";
			$k=length($i);
			}
		print STDERR $i . " ";
		}
	foreach $i (sort keys %table)
		{
		next if $table{$i}->{template};
		next if $i !~ /^debug/;
		$k += length($i) + 1;
		if ($k > 78)
			{
			print STDERR "\n";
			$k=length($i);
			}
		print STDERR $i . " ";
		}
	print STDERR "\n\nNOTE: If in doubt, on Unix-ish systems use './config'.\n";
	exit(1);
	}

sub run_dofile()
{
    my $in = shift;
    my $out = shift;

    # should we remove $out ?
    system("$config{perl} -I. -Mconfigdata util/dofile.pl <$in >$out.new");
    exit 1 if $? != 0;
    rename("$out.new", $out) || die "Can't rename $out.new, $!";
}

# Configuration printer ##############################################

sub print_table_entry
{
    my $target = shift;
    my %target = resolve_config($target);
    my $type = shift;

    # Don't print the templates
    return if $target{template};

    my @sequence = (
	"cc",
	"cflags",
	"debug_cflags",
	"release_cflags",
	"unistd",
	"thread_cflag",
	"sys_id",
	"lflags",
	"debug_lflags",
	"release_lflags",
	"bn_ops",
	"cpuid_obj",
	"bn_obj",
	"ec_obj",
	"des_obj",
	"aes_obj",
	"bf_obj",
	"md5_obj",
	"sha1_obj",
	"cast_obj",
	"rc4_obj",
	"rmd160_obj",
	"rc5_obj",
	"wp_obj",
	"cmll_obj",
	"modes_obj",
	"engines_obj",
	"perlasm_scheme",
	"dso_scheme",
	"shared_target",
	"shared_cflag",
	"shared_ldflag",
	"shared_extension",
	"ranlib",
	"arflags",
	"multilib",
	);

    if ($type eq "TABLE") {
	print "\n";
	print "*** $target\n";
	printf "\$%-12s = %s\n", $_, $target{$_} foreach (@sequence);
    } elsif ($type eq "HASH") {
	my $largest =
	    length((sort { length($a) <=> length($b) } @sequence)[-1]);
	print "    '$target' => {\n";
	foreach (@sequence) {
	    if ($target{$_}) {
		print "      '",$_,"'"," " x ($largest - length($_))," => '",$target{$_},"',\n";
	    }
	}
	print "    },\n";
    }
}

# Utility routines ###################################################

sub which
	{
	my($name)=@_;
	my $path;
	foreach $path (split /:/, $ENV{PATH})
		{
		if (-f "$path/$name$target{exe_extension}" and -x _)
			{
			return "$path/$name$target{exe_extension}" unless ($name eq "perl" and
			 system("$path/$name$target{exe_extension} -e " . '\'exit($]<5.0);\''));
			}
		}
	}

sub print_table_entry
	{
	my $target = shift;
	my %target = resolve_config($target);
	my $type = shift;

	# Don't print the templates
	return if $target{template};

	if ($type eq "TABLE") {
	    print <<"EOF"

*** $target
\$cc           = $target{cc}
\$cflags       = $target{cflags}
\$debug_cflags   = $target{debug_cflags}
\$release_cflags = $target{release_cflags}
\$unistd       = $target{unistd}
\$thread_cflag = $target{thread_cflag}
\$sys_id       = $target{sys_id}
\$lflags       = $target{lflags}
\$debug_lflags   = $target{debug_lflags}
\$release_lflags = $target{release_lflags}
\$bn_ops       = $target{bn_ops}
\$cpuid_obj    = $target{cpuid_obj}
\$bn_obj       = $target{bn_obj}
\$ec_obj       = $target{ec_obj}
\$des_obj      = $target{des_obj}
\$aes_obj      = $target{aes_obj}
\$bf_obj       = $target{bf_obj}
\$md5_obj      = $target{md5_obj}
\$sha1_obj     = $target{sha1_obj}
\$cast_obj     = $target{cast_obj}
\$rc4_obj      = $target{rc4_obj}
\$rmd160_obj   = $target{rmd160_obj}
\$rc5_obj      = $target{rc5_obj}
\$wp_obj       = $target{wp_obj}
\$cmll_obj     = $target{cmll_obj}
\$modes_obj    = $target{modes_obj}
\$engines_obj  = $target{engines_obj}
\$chacha_obj   = $target{chacha_obj}
\$poly1305_obj = $target{poly1305_obj}
\$perlasm_scheme = $target{perlasm_scheme}
\$dso_scheme   = $target{dso_scheme}
\$shared_target= $target{shared_target}
\$shared_cflag = $target{shared_cflag}
\$shared_ldflag = $target{shared_ldflag}
\$shared_extension = $target{shared_extension}
\$ranlib       = $target{ranlib}
\$arflags      = $target{arflags}
\$multilib     = $target{multilib}
EOF
	} elsif ($type eq "HASH") {
	    my @sequence = (
		"cc",
		"cflags",
		"debug_cflags",
		"release_cflags",
		"unistd",
		"thread_cflag",
		"sys_id",
		"lflags",
		"debug_lflags",
		"release_lflags",
		"bn_ops",
		"cpuid_obj",
		"bn_obj",
		"ec_obj",
		"des_obj",
		"aes_obj",
		"bf_obj",
		"md5_obj",
		"sha1_obj",
		"cast_obj",
		"rc4_obj",
		"rmd160_obj",
		"rc5_obj",
		"wp_obj",
		"cmll_obj",
		"modes_obj",
		"engines_obj",
		"chacha_obj",
		"poly1305_obj",
		"perlasm_scheme",
		"dso_scheme",
		"shared_target",
		"shared_cflag",
		"shared_ldflag",
		"shared_extension",
		"ranlib",
		"arflags",
		"multilib",
		);
	    my $largest =
		length((sort { length($a) <=> length($b) } @sequence)[-1]);
	    print "    '$target' => {\n";
	    foreach (@sequence) {
		if ($target{$_}) {
		    print "      '",$_,"'"," " x ($largest - length($_))," => '",$target{$_},"',\n";
		}
	    }
	    print "    },\n";
	}
	}

sub quotify {
    my %processors = (
	perl    => sub { my $x = shift;
			 $x =~ s/([\\\$\@"])/\\$1/g;
			 return '"'.$x.'"'; },
	);
    my $for = shift;
    my $processor =
	defined($processors{$for}) ? $processors{$for} : sub { shift; };

    map { $processor->($_); } @_;
}

# collect_information($filename, $line_continue, $regexp => $CODEref, ...)
# $filename is the file to read.
# $line_continue is either undef (which is a noop), or two arguments, where
# the first is a regexp detecting a line continuation ending, and the
# following argument is a CODEref that takes care of concatenating two
# lines.
# All following arguments are regex/CODEref pairs, where the regexp detects a
# line and the CODEref does something with the result of the regexp.
sub collect_information {
    my $filename = shift;
    my $line_continue_re = shift;
    my $line_concat = defined($line_continue_re) ? shift : undef;
    my %collectors = @_;

    my $saved_line = "";
    open IN, $filename || die "unable to read $filename: $!\n";
    while(<IN>) {
	chomp;
	if (defined $line_concat) {
	    $_ = $line_concat->($saved_line, $_);
	}
	if (defined $line_continue_re && /$line_continue_re/) {
	    $saved_line = $_;
	    next;
	}
	foreach my $re (keys %collectors) {
	    if (/$re/) { $collectors{$re}->() };
	}
    }
    close IN;
}