This allows us to link the other tools against our libz and we do not
need the system zlib any more.

Only the static linked library is copied to the staging directory so we
have a statically linked library on all systems and not only on Linux.
This also adds the new dependencies of the packages which are depending
on zlib.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

Instead of inferring the availability of NEON support from the target
optimization flags, use a preprocessor test to decide whether to enable
ARMv8 NEON optimizations.

Fixes the following build error spotted by the mediatek/32 buildbot:

    [ 26%] Building C object CMakeFiles/zlib.dir/contrib/arm/inflate.o
    In file included from .../zlib-1.2.11/contrib/arm/chunkcopy.h:10:0,
                     from .../zlib-1.2.11/contrib/arm/inflate.c:87:
    .../arm_neon.h:31:2: error: #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
     #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
      ^
    In file included from .../zlib-1.2.11/contrib/arm/inflate.c:87:0:
    .../zlib-1.2.11/contrib/arm/chunkcopy.h:18:9: error: unknown type name 'uint8x16_t'
     typedef uint8x16_t chunkcopy_chunk_t;
             ^
    [...]
    CMakeFiles/zlib.dir/build.make:302: recipe for target 'CMakeFiles/zlib.dir/contrib/arm/inflate.o' failed

Fixes: 3acecba520 "package/libs/zlib: Add ARM and NEON optimizations"
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Some packages such as Python/Python3 (host pip/pip3) needs this
to compile.

More detailed explanation provided by Alexandru:

"i need the zlib/host for Python/Python3 ; because, it seems the
host pip/pip3 needs this to work ; i suspect in older versions
this worked, because some of the host's build env would be used
in the build, and then the zlib-dev from the host distro would
be used ; now, the host-build does not seem to have any
-I/usr/include stuff, which is good

and it also seems that Python/Python3 does not like it if the
zlib-dev package is too old, so using this zlib/host would be
good for this as well"

Source:
https://github.com/lede-project/source/pull/1329#issuecomment-351055861

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Add option to use O3 optimization as not all devices have
space constraints. This option is default using GCC in upstream
but isn't in the CMake makefile for some reason.

Source: https://github.com/madler/zlib/blob/master/configure#L170

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

This adds two optimizations for ARM:
NEON optimized Adler(-)32 checksum algorithm (ARMv7 and newer NEON CPUs)
ARM(v7+) specific optimization for inflate
I've also connected inflate optimization to the build using the following
source as template.
https://github.com/mirror/chromium/commit/0397489124ce7e6aced020f8b85f5034c7d5f49b#diff-a62ad2db6c83dbc205d34bb9a8884f16

Additional info:
https://codereview.chromium.org/2676493007/
https://codereview.chromium.org/2722063002/

Sources:
https://github.com/madler/zlib/pull/251 (only the first commit)
https://github.com/madler/zlib/pull/256

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Use build logic provided by toolchain instead of doing it manually.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

CPE ids helps to tracks CVE in packages.
https://cpe.mitre.org/specification/

Thanks to swalker for CPE to package mapping and
keep tracking CVEs.

Acked-by: Jo-Philipp Wich <jo@mein.io>
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

Update to 1.2.11 as suggested by upstream
Also add SF as primary source and main site as fallback

Note: SF doesn't carry the 1.2.11 update yet.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

* Fix bug in deflate_stored() for zero-length input
* Fix bug in gzwrite.c that produced corrupt gzip files

Signed-off-by: Magnus Kroken <mkroken@gmail.com>