Misc afalg build fixes as suggested by Richard Levitte for the latest
Configure changes.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

1. Cleaned up eventfd handling
2. Reworked socket setup code to allow other algorithms to be added in
   future
3. Fixed compile errors for static build
4. Added error to error stack in all cases of ALG_PERR/ALG_ERR
5. Called afalg_aes_128_cbc() from bind() to avoid race conditions
6. Used MAX_INFLIGHT define in io_getevents system call
7. Coding style fixes
Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

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

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

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

MR: #2203

RC4 based ciphersuites in libssl have been disabled by default. They can
be added back by building OpenSSL with the "enable-weak-ssl-ciphers"
Configure option at compile time.
Reviewed-by: NRich Salz <rsalz@openssl.org>

The proper logic is that both zlib and zlib-dynamic are disabled by
default and that enabling zlib-dynamic would enable zlib.  Somewhere
along the way, the logic got changed, zlib-dynamic was enabled by
default and zlib didn't get automatically enabled.

This change restores the original logic.
Reviewed-by: NRich Salz <rsalz@openssl.org>

We copied $target{cflags}, $target{defines} and a few more to %config,
just to add to the entries.  Avoid doing so, and let the build templates
deal with combining the two.

There are a few cases where we still fiddle with %target, but that's
acceptable.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

The thread_cflag setting filled a double role, as kinda sorta an
indicator of thread scheme, and as cflags.  Some configs also added
lflags and ex_libs for multithreading regardless of if threading would
be enabled or not.

Instead of this, add threading cflags among in the cflag setting,
threading lflags in the lflag setting and so on if and only if threads
are enabled (which they are by default).

Also, for configs where there are no special cflags for threading (the
VMS configs are of that kind), this makes it possible to still clearly
mention what thread scheme is used.

The exact value of thread scheme is currently ignored except when it's
"(unknown)", and thereby only serves as a flag to tell if we know how
to build for multi-threading in a particular config.  Yet, the
currently used values are "(unknown)", "pthreads", "uithreads" (a.k.a
solaris threads) and "winthreads".
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Instead, make the build type ("debug" or "release") available through
$config{build_type} and let the configs themselves figure out what the
usual settings (such as "cflags", "lflags" and so on) should be
accordingly.

The benefit with this is that we can now have debug and release
variants of any setting, not just those Configure supports, and may
also involve other factors (the MSVC flags /MD[d] and /MT[d] involve
both build type and whether threading is enabled or not)
Reviewed-by: NAndy Polyakov <appro@openssl.org>

$target{lflags} and $target{plib_flag} were copied to %config for no
good reason.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Configure had the Unix centric addition of -lz when linking with zlib
is enabled, which doesn't work on other platforms.  Therefore, we move
it to the BASE_unix config template and add corresponding ones in the
other BASE_* config templates.  The Windows one is probably incomplete,
but that doesn't matter for the moment, as mk1mf does it's own thing
anyway.

This required making the %withargs table global, so perl snippets in
the configs can use it.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

These BASE templates are intended to hold values that are common for
all configuration variants for whole families of configurations.

So far, three "families" are identified: Unix, Windows and VMS, mostly
characterised by the build system they currently use.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

This provides for more powerful lazy evaluation and buildup of the
setting contents.  For example, something like this becomes possible:

    defines => [ sub { $config{thisorthat} ? "FOO" : () } ]

Any undefined result of such functions (such as 'undef' or the empty
list) will be ignored.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

We allow some commands to be overriden, but didn't handle that in a
consistent manner.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

There are cases, for example when configuring no-asm, that the added
uplink source files got in the way of the cpuid ones.  The best way to
solve this is to separate the two.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

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

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

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

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

Reviewed-by: NMatt Caswell <matt@openssl.org>

They now default to " " as separator, but that can be overridden by
having a hash with parameters as last argument.  The only currently
recognised parameter is `separator'.

The special separator `undef' will force the result to become a list
rather than a concatenated string.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

In the earlier change, where static libraries get built with position
independent code, OPENSSL_PIC was removed by mistake.  This adds it
back.
Reviewed-by: NTim Hudson <tjh@openssl.org>

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

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

The commit 1288f26f says that it fixes no-async, but instead seems to break
it. Therefore revert that change and fix no-async.
Reviewed-by: NRich Salz <rsalz@openssl.org>

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

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

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

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

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

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

This way, we can use them as conditions instead of relying to more or
less obscure aliases in %config or variables directly in Configure.
Reviewed-by: NRich Salz <rsalz@openssl.org>

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

Preserved for now for those who have scripts with the option
"no-ssl2".  We warn that it's deprecated, and ignore it otherwise.

In response to RT#4330
Reviewed-by: NRich Salz <rsalz@openssl.org>

Building shared libraries or not is not the same as building position
independent code or not.  It's true that if you don't build PIC, you
can't build shared libraries.  However, you may very well want to
build only static libraries but still want PIC code.

Therefore, we introduce a new configuration option "pic", which is
enabled by default or explicitely with "enable-pic", or disabled with
"no-pic" or "disable-pic".  Of course, if "pic" is disabled, "shared"
and "dynamic-engine" are automatically disabled as well.
Reviewed-by: NRich Salz <rsalz@openssl.org>

We were kinda sorta using a mix of $disabled{"static-engine" and
$disabled{"dynamic-engine"} in Configure.  Let's avoid confusion,
choose one of them and stick to it.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Until now, the engines in engines/ were only built as dynamicaly
loadable ones if shared libraries were built.

We not dissociate the two and can build dynamicaly loadable engines
even if we only build static libcrypto and libssl.  This is controlled
with the option (enable|disable|no)-static-engine, defaulting to
no-static-engine.

Note that the engines in crypto/engine/ (dynamic and cryptodev) will
always be built into libcrypto.
Reviewed-by: NRich Salz <rsalz@openssl.org>

This takes us away from the idea that we know exactly how our static
libraries are going to get used.  Instead, we make them available to
build shareable things with, be it other shared libraries or DSOs.

On the other hand, we also have greater control of when the shared
library cflags.  They will never be used with object files meant got
binaries, such as apps/openssl or test/test*.

With unified, we take this a bit further and prepare for having to
deal with extra cflags specifically to be used with DSOs (dynamic
engines), libraries and binaries (applications).
Reviewed-by: NRich Salz <rsalz@openssl.org>

Better libclean that removes the exact files that have been built,
nothing more and nothing less.

Corrected typo

A couple of editorial changes.
Reviewed-by: NAndy Polyakov <appro@openssl.org>