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.org 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] [sctp] [386] [--prefix=DIR] [--openssldir=OPENSSLDIR] [--with-xxx[=vvv]] [--test-sanity] [--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.
# --openssldir  install OpenSSL in OPENSSLDIR (Default: DIR/ssl if the
#               --prefix option is given; /usr/local/ssl otherwise)
# --prefix      prefix for the OpenSSL include, lib and bin directories
#               (Default: the OPENSSLDIR directory)
#
# --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".
#
# --test-sanity Make a number of sanity checks on the data in this file.
#               This is a debugging tool for OpenSSL developers.
#
# --cross-compile-prefix Add specified prefix to binutils components.
#
# 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-]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 -DCRYPTO_MDEBUG_ALL -DCRYPTO_MDEBUG_ABORT -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";

# 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";

#$bits1="SIXTEEN_BIT ";
#$bits2="THIRTY_TWO_BIT ";
my $bits1="THIRTY_TWO_BIT ";
my $bits2="SIXTY_FOUR_BIT ";

# 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";

# table of known configurations, read in from files
#
# The content of each entry can take one of two forms:
#
# - old style config-string, colon seperated fields with exactly the
#   following structure.:
#
#	$cc : $cflags : $unistd : $thread_cflag : $sys_id : $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
#
#   We use the stringtohash function - defined below - to combine with the
#   fields and form a proper hash table from the string.
#
# - direct transfer of old style config string to hash table, using the names
#   of the fields as keys:
#
#	{
#	  cc => $cc,
#	  cflags => $cflags,
#	  unistd => $unistd,
#	  thread_cflag => $thread_cflag,
#	  sys_id => $sys_id,
#	  lflags => $lflags,
#	  bn_ops => $bn_ops,
#	  cpuid_obj => $cpuid_obj,
#	  bn_obj => $bn_obj,
#	  ec_obj => $ec_obj,
#	  des_obj => $des_obj,
#	  aes_obj => $aes_obj,
#	  bf_obj => $bf_obj,
#	  md5_obj => $md5_obj,
#	  sha1_obj => $sha1_obj,
#	  cast_obj => $cast_obj,
#	  rc4_obj => $rc4_obj,
#	  rmd160_obj => $rmd160_obj,
#	  rc5_obj => $rc5_obj,
#	  wp_obj => $wp_obj,
#	  cmll_obj => $cmll_obj,
#	  modes_obj => $modes_obj,
#	  engines_obj => $engines_obj,
#	  perlasm_scheme => $perlasm_scheme,
#	  dso_scheme => $dso_scheme,
#	  shared_target => $shared_target,
#	  shared_cflag => $shared_cflag,
#	  shared_ldflag => $shared_ldflag,
#	  shared_extension => $shared_extension,
#	  ranlib => $ranlib,
#	  arflags => $arflags,
#	  multilib => $multilib
#	}
#
# - new style config hash table, which has additional attributes for debug
#   and non-debug flags to be added to the common flags, for cflags and lflags:
#
#	{
#	  cc => $cc,
#	  cflags => $cflags,
#	  debug_cflags => $debug_cflags,
#	  release_cflags => $release_cflags,
#	  unistd => $unistd,
#	  thread_cflag => $thread_cflag,
#	  sys_id => $sys_id,
#	  lflags => $lflags,
#	  debug_lflags => $debug_lflags,
#	  release_lflags => $release_lflags,
#	  bn_ops => $bn_ops,
#	  cpuid_obj => $cpuid_obj,
#	  bn_obj => $bn_obj,
#	  ec_obj => $ec_obj,
#	  des_obj => $des_obj,
#	  aes_obj => $aes_obj,
#	  bf_obj => $bf_obj,
#	  md5_obj => $md5_obj,
#	  sha1_obj => $sha1_obj,
#	  cast_obj => $cast_obj,
#	  rc4_obj => $rc4_obj,
#	  rmd160_obj => $rmd160_obj,
#	  rc5_obj => $rc5_obj,
#	  wp_obj => $wp_obj,
#	  cmll_obj => $cmll_obj,
#	  modes_obj => $modes_obj,
#	  engines_obj => $engines_obj,
#	  dso_scheme => $dso_scheme,
#	  shared_target => $shared_target,
#	  shared_cflag => $shared_cflag,
#	  shared_ldflag => $shared_ldflag,
#	  shared_extension => $shared_extension,
#	  ranlib => $ranlib,
#	  arflags => $arflags,
#	  multilib => $multilib
#	}
#
# The configuration reader will do what it can to translate everything into
# new style config hash tables, including merging $target and debug-$target
# if they are similar enough.
#
# The configuration hashes can refer to templates in two different manners:
#
# - as part of the hash, one can have a key called 'inherit_from' that
#   indicate what other configuration hashes to inherit data from.
#   These are resolved recursively.
#
#   Inheritance works as a set of default values that can be overriden
#   by corresponding attribute values in the inheriting configuration.
#
#   If several configurations are given in the 'inherit_from' array, the
#   values of same attribute are concatenated with space separation.
#   With this, it's possible to have several smaller templates for
#   different configuration aspects that can be combined into a complete
#   configuration.
#
#   Example:
#
#	"foo" => {
#		template => 1,
#		haha => "haha",
#		hoho => "ho"
#	},
#	"bar" => {
#		template => 1,
#		hoho => "ho",
#		hehe => "hehe"
#	},
#	"laughter" => {
#		inherit_from => [ "foo", "bar" ],
#	}
#
#	The entry for "foo" will become as follows after processing:
#
#	"laughter" => {
#		haha => "haha",
#		hoho => "ho ho",
#		hehe => "hehe"
#	}
#
#   Note 1: any entry from the table can be used as a template.
#   Note 2: pure templates have the attribute 'template => 1' and cannot
#           be used as targets.
#
# - instead of a string, one can have a code block of the form
#   'sub { /* your code here */ }', where the arguments are the list of
#   inherited values for that key.  In fact, the concatenation of strings
#   is really done by using 'sub { join(" ",@_) }' on the list of inherited
#   values.
#
#   Example:
#
#	"foo" => {
#		template => 1,
#		haha => "ha ha",
#		hoho => "ho",
#		ignored => "This should not appear in the end result",
#	},
#	"bar" => {
#		template => 1,
#		haha => "ah",
#		hoho => "haho",
#		hehe => "hehe"
#	},
#	"laughter" => {
#		inherit_from => [ "foo", "bar" ],
#		hehe => sub { join(" ",(@_,"!!!")) },
#		ignored => "",
#	}
#
#	The entry for "foo" will become as follows after processing:
#
#	"laughter" => {
#		haha => "ha ha ah",
#		hoho => "ho haho",
#		hehe => "hehe !!!",
#		ignored => ""
#	}
#

my %table=(

    # All these templates are merely a translation of the corresponding
    # variables further up.
    #
    # Note: as long as someone might use old style configuration strings,
    # or we bother supporting that, those variables need to stay

    x86_asm => {
	template	=> 1,
	cpuid_obj	=> "x86cpuid.o",
	bn_obj		=> "bn-586.o co-586.o x86-mont.o x86-gf2m.o",
	ec_obj		=> "ecp_nistz256.o ecp_nistz256-x86.o",
	des_obj		=> "des-586.o crypt586.o",
	aes_obj		=> "aes-586.o vpaes-x86.o aesni-x86.o",
	bf_obj		=> "bf-586.o",
	md5_obj		=> "md5-586.o",
	sha1_obj	=> "sha1-586.o sha256-586.o sha512-586.o",
	rc4_obj		=> "rc4-586.o",
	rmd160_obj	=> "rmd-586.o",
	rc5_obj		=> "rc5-586.o",
	wp_obj		=> "wp_block.o wp-mmx.o",
	cmll_obj	=> "cmll-x86.o",
	modes_obj	=> "ghash-x86.o",
	engines_obj	=> "e_padlock-x86.o"
    },
    x86_elf_asm => {
	template	=> 1,
	inherit_from	=> [ "x86_asm" ],
	perlasm_scheme	=> "elf"
    },
    x86_64_asm => {
	template	=> 1,
	cpuid_obj       => "x86_64cpuid.o",
	bn_obj          => "x86_64-gcc.o x86_64-mont.o x86_64-mont5.o x86_64-gf2m.o rsaz_exp.o rsaz-x86_64.o rsaz-avx2.o",
	ec_obj          => "ecp_nistz256.o ecp_nistz256-x86_64.o",
	aes_obj         => "aes-x86_64.o vpaes-x86_64.o bsaes-x86_64.o aesni-x86_64.o aesni-sha1-x86_64.o aesni-sha256-x86_64.o aesni-mb-x86_64.o",
	md5_obj         => "md5-x86_64.o",
	sha1_obj        => "sha1-x86_64.o sha256-x86_64.o sha512-x86_64.o sha1-mb-x86_64.o sha256-mb-x86_64.o",
	rc4_obj         => "rc4-x86_64.o rc4-md5-x86_64.o",
	wp_obj          => "wp-x86_64.o",
	cmll_obj        => "cmll-x86_64.o cmll_misc.o",
	modes_obj       => "ghash-x86_64.o aesni-gcm-x86_64.o",
	engines_obj     => "e_padlock-x86_64.o"
    },
    ia64_asm => {
	template	=> 1,
	cpuid_obj       => "ia64cpuid.o",
	bn_obj          => "bn-ia64.o ia64-mont.o",
	aes_obj         => "aes_core.o aes_cbc.o aes-ia64.o",
	md5_obj         => "md5-ia64.o",
	sha1_obj        => "sha1-ia64.o sha256-ia64.o sha512-ia64.o",
	rc4_obj         => "rc4-ia64.o rc4_skey.o",
	modes_obj       => "ghash-ia64.o",
	perlasm_scheme	=> "void"
    },
    sparcv9_asm => {
	template	=> 1,
	cpuid_obj       => "sparcv9cap.o sparccpuid.o",
	bn_obj          => "bn-sparcv9.o sparcv9-mont.o sparcv9a-mont.o vis3-mont.o sparct4-mont.o sparcv9-gf2m.o",
        ec_obj          => "ecp_nistz256.o ecp_nistz256-sparcv9.o",
	des_obj         => "des_enc-sparc.o fcrypt_b.o dest4-sparcv9.o",
	aes_obj         => "aes_core.o aes_cbc.o aes-sparcv9.o aest4-sparcv9.o",
	md5_obj         => "md5-sparcv9.o",
	sha1_obj        => "sha1-sparcv9.o sha256-sparcv9.o sha512-sparcv9.o",
	cmll_obj        => "camellia.o cmll_misc.o cmll_cbc.o cmllt4-sparcv9.o",
	modes_obj       => "ghash-sparcv9.o",
	perlasm_scheme	=> "void"
    },
    sparcv8_asm => {
	template	=> 1,
	cpuid_obj       => "",
	bn_obj          => "sparcv8.o",
	des_obj         => "des_enc-sparc.o fcrypt_b.o",
	perlasm_scheme	=> "void"
    },
    alpha_asm => {
	template	=> 1,
	cpuid_obj       => "alphacpuid.o",
	bn_obj          => "bn_asm.o alpha-mont.o",
	sha1_obj        => "sha1-alpha.o",
	modes_obj       => "ghash-alpha.o",
	perlasm_scheme	=> "void"
    },
    mips32_asm => {
	template	=> 1,
	bn_obj          => "bn-mips.o mips-mont.o",
	aes_obj         => "aes_cbc.o aes-mips.o",
	sha1_obj        => "sha1-mips.o sha256-mips.o",
    },
    mips64_asm => {
	inherit_from	=> [ "mips32_asm" ],
	template	=> 1,
	sha1_obj        => sub { join(" ", @_, "sha512-mips.o") }
    },
    s390x_asm => {
	template	=> 1,
	cpuid_obj       => "s390xcap.o s390xcpuid.o",
	bn_obj          => "bn-s390x.o s390x-mont.o s390x-gf2m.o",
	aes_obj         => "aes-s390x.o aes-ctr.o aes-xts.o",
	sha1_obj        => "sha1-s390x.o sha256-s390x.o sha512-s390x.o",
	rc4_obj         => "rc4-s390x.o",
	modes_obj       => "ghash-s390x.o",
    },
    armv4_asm => {
	template	=> 1,
	cpuid_obj       => "armcap.o armv4cpuid.o",
	bn_obj          => "bn_asm.o armv4-mont.o armv4-gf2m.o",
	ec_obj          => "ecp_nistz256.o ecp_nistz256-armv4.o",
	aes_obj         => "aes_cbc.o aes-armv4.o bsaes-armv7.o aesv8-armx.o",
	sha1_obj        => "sha1-armv4-large.o sha256-armv4.o sha512-armv4.o",
	modes_obj       => "ghash-armv4.o ghashv8-armx.o",
	perlasm_scheme	=> "void"
    },
    aarch64_asm => {
	template	=> 1,
	cpuid_obj       => "armcap.o arm64cpuid.o mem_clr.o",
	ec_obj          => "ecp_nistz256.o ecp_nistz256-armv8.o",
	bn_obj          => "bn_asm.o armv8-mont.o",
	aes_obj         => "aes_core.o aes_cbc.o aesv8-armx.o vpaes-armv8.o",
	sha1_obj        => "sha1-armv8.o sha256-armv8.o sha512-armv8.o",
	modes_obj       => "ghashv8-armx.o",
    },
    parisc11_asm => {
	template	=> 1,
	cpuid_obj       => "pariscid.o",
	bn_obj          => "bn_asm.o parisc-mont.o",
	aes_obj         => "aes_core.o aes_cbc.o aes-parisc.o",
	sha1_obj        => "sha1-parisc.o sha256-parisc.o sha512-parisc.o",
	rc4_obj         => "rc4-parisc.o",
	modes_obj       => "ghash-parisc.o",
	perlasm_scheme	=> "32"
    },
    parisc20_64_asm => {
	template	=> 1,
	inherit_from	=> [ "parisc11_asm" ],
	bn_obj          => sub { my $r=join(" ",@_); $r=~s/bn_asm/pa-risc2W/; $r; },
	perlasm_scheme	=> "64",
    },
    ppc64_asm => {
	template	=> 1,
	cpuid_obj       => "ppccpuid.o ppccap.o",
	bn_obj          => "bn-ppc.o ppc-mont.o ppc64-mont.o",
	aes_obj         => "aes_core.o aes_cbc.o aes-ppc.o vpaes-ppc.o aesp8-ppc.o",
	sha1_obj        => "sha1-ppc.o sha256-ppc.o sha512-ppc.o sha256p8-ppc.o sha512p8-ppc.o",
	modes_obj       => "ghashp8-ppc.o",
    },
    ppc32_asm => {
	inherit_from	=> [ "ppc64_asm" ],
	template	=> 1
    },
);

{   my $no_asm_templates=0;
    foreach (@ARGV) { $no_asm_templates=1 if (/^\-?no\-asm$/); }
    sub asm { $no_asm_templates?():@_; }
}


sub stringtohash {
    my $in = shift @_;
    if (ref($in) eq "HASH") {
	return $in;
    }
    my @stringsequence = (
	"cc",
	"cflags",
	"unistd",
	"thread_cflag",
	"sys_id",
	"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",
	);

    # return a ref to a hash, that's what the outer braces are for.
    return { map { shift @stringsequence => $_ } split /:/, $in };
};

# Read configuration target stanzas from a file, so that people can have
# local files with their own definitions
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 = ();
	eval $content;

	# Make sure we have debug- targets first
	my @keys =
	    sort {
		my $a_nd = $a =~ m/^debug-/ ? $' :$a;
		my $b_nd = $b =~ m/^debug-/ ? $' :$b;
		my $res = 0;

		if (($a_nd == $a) == ($b_nd == $b)) {
		    # they are both debug- or not, compare them as they are
		    $res = $a cmp $b;
		} elsif ($a_nd != $a) {
		    # $a is debug-, make it lesser
		    $res = -1;
		} else {
		    # $b is debug-, make $a greater
		    $res = 1;
		}
		$res;
	    } keys %targets;

	foreach (@keys) {
	    if (ref($targets{$_}) ne "HASH") {
		# Value is assumed to be a string.  Split it up to
		# become a hash table of parameters.  Also, try to
		# merge debug- variants with the non-debug target.

		# Start with converting the value from a string to a
		# standardised hash of fields.  Using $tohash is safe,
		# if the input is already a hash ref, it's just returned
		# back.
		$targets{$_} = stringtohash($targets{$_});

		# If the current target is a debug target, there might
		# be a corresponding non-debug target that we can merge
		# with.  If it isn't a debug- target, we've already done
		# as much merging as we can and do not need to bother
		# with that any more.
		if ($_ =~ m/^debug-/) {
		    my $debugkey = $_;
		    my $nondebugkey = $';
		    my $debug = $targets{$debugkey};
		    my $nondebug;

		    if ($targets{$nondebugkey}) {
			$nondebug = stringtohash($targets{$nondebugkey});
		    }

		    if ($nondebug) {
			# There's both a debug and non-debug variant of
			# this target, so we should try to merge them
			# together.

			# First, check that the non-debug variant isn't
			# already built up with all it should have.
			if ($nondebug->{debug_cflags}
			    || $nondebug->{release_cflags}
			    || $nondebug->{debug_lflags}
			    || $nondebug->{release_lflags}) {
			    warn "there's a debug target $debugkey to be merged with a target $nondebugkey, but the latter seems to already have both nodebug and debug information.  This requires human intervention.  Skipping $debugkey...";
			    next;
			}

			# Now, check similarity.
			# For keys they have in common, support that
			# cflags and lflags can differ, otherwise they
			# must have exactly the same values for them
			# to be merged into one.
			my $similarenough = 1;
			for (keys %{$debug}) {
			    if ($nondebug->{$_} ne $debug->{$_}
				&& $_ !~ m/^[cl]flags$/) {
				$similarenough = 0;
				last;
			    }
			}

			if ($similarenough) {
			    # Here's where the magic happens, split the
			    # options in the debug and non-debug variants
			    # cflags and ldflags into three strings each,
			    # one with common flags, one with extra debug
			    # flags and one with extra non-debug flags.

			    # The result ends up in %h_nondebug, which
			    # becomes the merged variant when we're done.
			    # for each of cflags and lflags, they are
			    # replaced with cflags, debug_cflags,
			    # release_cflags and similar for lflags.
			    #
			    # The purpose is that 'cflags' should be
			    # used together with 'debug_cflags' or
			    # 'release_cflags' depending on what the
			    # user asks for.
			    foreach (("cflags", "lflags")) {
				my @list_d = split /\s+/, $debug->{$_};
				my @list_nd = split /\s+/, $nondebug->{$_};
				my %presence = (); # bitmap
						   # 1: present in @list_d
						   # 2: present in @list_nd
						   # 3: present in both
				map { $presence{$_} += 1; } @list_d;
				map { $presence{$_} += 2; } @list_nd;

				delete $nondebug->{$_};
				# Note: we build from the original lists to
				# preserve order, it might be important
				$nondebug->{"debug-".$_} =
				    join(" ",
					 grep { $presence{$_} == 1 } @list_d);
				$nondebug->{"nodebug-".$_} =
				    join(" ",
					 grep { $presence{$_} == 2 } @list_nd);
				$nondebug->{$_} =
				    join(" ",
					 grep { $presence{$_} == 3 } @list_d);
			    }

			    $targets{$nondebugkey} = $nondebug;
			    delete $targets{$debugkey};
			}
		    }
		}
	    }
	}

	%table = (%table, %targets);

	# Local function to resolve inheritance
	my $resolve_inheritance;
	$resolve_inheritance =
	    sub {
		my $target = shift;
		my @breadcrumbs = @_;

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

		# 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}) {
		    foreach (@{$table{$target}->{inherit_from}}) {
			my %inherited_config =
			    $resolve_inheritance->($_, $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 = sub { join(' ',@_) };

		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 "") {
			# 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.
		%{$table{$target}};
	};

	# Go through all new targets and resolve inheritance and template
	# references.
	foreach (keys %targets) {
	    # We're ignoring the returned values here, they are only valuable
	    # to the inner recursion of this function.
	    $resolve_inheritance->($_);
	}
}

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

my @MK1MF_Builds=qw(VC-WIN64I VC-WIN64A
		    debug-VC-WIN64I debug-VC-WIN64A
		    VC-NT VC-CE VC-WIN32 debug-VC-WIN32
		    BC-32
		    netware-clib netware-clib-bsdsock
		    netware-libc netware-libc-bsdsock);

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