Adapted from BoringSSL. Added a test.

The extension parsing code is already attempting to already handle this for
some individual extensions, but it is doing so inconsistently. Duplicate
efforts in individual extension parsing will be cleaned up in a follow-up.
Reviewed-by: NStephen Henson <steve@openssl.org>

All those flags existed because we had all the dependencies versioned
in the repository, and wanted to have it be consistent, no matter what
the local configuration was.  Now that the dependencies are gone from
the versioned Makefile.ins, it makes much more sense to use the exact
same flags as when compiling the object files.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Add -DBIO_DEBUG to --strict-warnings.
Remove comments about outdated debugging ifdef guards.
Remove md_rand ifdef guarding an assert; it doesn't seem used.
Remove the conf guards in conf_api since we use OPENSSL_assert, not assert.
For pkcs12 stuff put OPENSSL_ in front of the macro name.
Merge TLS_DEBUG into SSL_DEBUG.
Various things just turned on/off asserts, mainly for checking non-NULL
arguments, which is now removed: camellia, bn_ctx, crypto/modes.
Remove some old debug code, that basically just printed things to stderr:
  DEBUG_PRINT_UNKNOWN_CIPHERSUITES, DEBUG_ZLIB, OPENSSL_RI_DEBUG,
  RL_DEBUG, RSA_DEBUG, SCRYPT_DEBUG.
Remove OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Thanks to Viktor for additional review.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NTim Hudson <tjh@openssl.org>

It's near impossible to figure out what goes wrong with the execution
of sub-commands otherwise.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

Reported in GH#684
Reviewed-by: NMatt Caswell <matt@openssl.org>

mk1mf was wondering about the options no-heartbeats and
no-crypto-mdebug-backtrace, so we add option hooks them.  They only
need to become OPENSSL_NO_ macros in opensslconf.h, so nothing
additional needs to be done.

Also, add "-DOPENSSL_PIC" when shared libraries are produced.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Reviewed-by: NAndy Polyakov <appro@openssl.org>

Three header files from crypto/include/internal were used by
util/mkdef.pl.  This should never be needed.  Some test program used
these, which made it a valid reason at the time to make the some
internal symbols public in the shared libraries, but that's not the
case any more.

However, to be able to link libssl.so, some symbols found in
include/internal headers still need to be made public.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

While IO::Socket::IP is a core perl module (since Perl v5.19.8, or so
says corelist), IO::Socket::INET6 has been around longer, is said to
be more widely deployed, and most importantly, seems to have less bugs
hitting us.  We therefore prefer IO::Socket::INET6, and only fall back
to IO::Socket::IP if the former doesn't exist on the local system.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

INSTALL_PREFIX is a confusing name, as there's also --prefix.
Instead, tag along with the rest of the open source world and adopt
the Makefile variable DESTDIR to designate the desired staging
directory.

The Configure option --install_prefix is removed, the only way to
designate a staging directory is with the Makefile variable (this is
also implemented for VMS' descrip.mms et al).
Reviewed-by: NRich Salz <rsalz@openssl.org>

Once upon a time, there was chop, which somply chopped off the last
character of $_ or a given variable, and it was used to take off the
EOL character (\n) of strings.

... but then, you had to check for the presence of such character.

So came chomp, the better chop which checks for \n before chopping it
off.  And this worked well, as long as Perl made internally sure that
all EOLs were converted to \n.

These days, though, there seems to be a mixture of perls, so lines
from files in the "wrong" environment might have \r\n as EOL, or just
\r (Mac OS, unless I'm misinformed).

So it's time we went for the more generic variant and use s|\R$||, the
better chomp which recognises all kinds of known EOLs and chops them
off.

A few chops were left alone, as they are use as surgical tools to
remove one last slash or one last comma.

NOTE: \R came with perl 5.10.0.  It means that from now on, our
scripts will fail with any older version.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Trouble is that LINK variable assignment in make-file interferes with
LINK environment variable, which can be used to modify Microsoft's
LINK.EXE behaviour.

RT#4289
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Add utility macros REF_ASSERT_NOT and REF_PRINT_COUNT
This is also RT 4181
Reviewed-by: NRichard Levitte <levitte@openssl.org>

With this, Cygwin and Mingw builds stand a much better chance to be
able to build outside of the source tree with the unified build.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Make OPENSSL_INIT_SETTINGS an opaque structure.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Because ENGINESDIR and OPENSSLDIR typically contains backslashes, they
need to be escaped just right.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Have apps/openssl display the result along with OPENSSLDIR

As part of this, add ENGINESDIR in util/mk1mf.pl
Reviewed-by: NRich Salz <rsalz@openssl.org>

Man, there were a lot of renamings :)
Reviewed-by: NRichard Levitte <levitte@openssl.org>

The old building scripts get removed, they are hopelessly gone in bit
rot by now.

Also remove the old symbol hacks.  They were needed needed to shorten
some names to 31 characters, and to resolve other symbol clashes.
Because we now compile with /NAMES=(AS_IS,SHORTENED), this is no
longer required.
Reviewed-by: NRich Salz <rsalz@openssl.org>

As part of this, change util/mkdef.pl to stop adding libraries to
depend on in its output.  mkdef.pl should ONLY output a symbol
vector.

Because symbol names can't be longer than 31 characters, we use the
compiler to shorten those that are longer down to 23 characters plus
an 8 character CRC.  To make sure users of our header files will pick
up on that automatically, add the DEC C supported extra headers files
__decc_include_prologue.h and __decc_include_epilogue.h.

Furthermore, we add a config.com, so VMS people can configure just as
comfortably as any Unix folks, thusly:

    @config
Reviewed-by: NRich Salz <rsalz@openssl.org>

Under certain conditions, one might not want to output certain
sections of a template file.  This adds the functions output_off() and
output_on(), reachable inside the templates.  And example usage in a
Makefile template could be this:

	@ : {- output_off() if $config{no_shared}; "" -}
	... lines dealing with shared libraries
	@ : {- output_on() -}
Reviewed-by: NRich Salz <rsalz@openssl.org>

Rebased and merged by me, with Ben's approval.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NBen Laurie <ben@openssl.org>

Fixes for the auto-init/deinit code based on review comments
Reviewed-by: NRichard Levitte <levitte@openssl.org>

This option disables automatic loading of the crypto/ssl error strings in
order to keep statically linked executable file size down
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Building on the pervious commit to auto initialise and de-initialise libssl
Reviewed-by: NRichard Levitte <levitte@openssl.org>

This builds on the previous commit to auto initialise/deinitialise
libcrypto.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

This commit provides the basis and core code for an auto initialisation
and deinitialisation framework for libcrypto and libssl. The intention is
to remove the need (in many circumstances) to call explicit initialise and
deinitialise functions. Explicit initialisation will still be an option,
and if non-default initialisation is needed then it will be required.
Similarly for de-initialisation (although this will be a lot easier since
it will bring all de-initialisation into a single function).
Reviewed-by: NRichard Levitte <levitte@openssl.org>

util/mkdef.pl and Makefile.shared needs to know about the source and
the build directories.

Additionally, Makefile.shared needs to know how to build shared
libraries in a directory other than the current one.
Reviewed-by: NBen Laurie <ben@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Deprecate undocumented SSL_cache_hit(). Make SSL_session_reused() into a
real function.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

This works on Linux with Make already, and allows running only specified
tests.
Reviewed-by: NBen Laurie <ben@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>