MDEV-24034 Policy CMP0075 is not set during compile

The policy is not set for 10.2
If it is set, CMake would complain about bundled zlib for which the policy
is not set.

Fix:
- Set policy for 10.2 for the top level project.
For 10.3+ it was already set

- Cleanup zlib to remove unneeded stuff. It is an internal static library,
it needs none of PROJECT, library versioning, RC file on Windows.
The name of the library on Unix does not make any difference, since it is
static and compiled in.

2 files changed, 3 insertions, 39 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4734c6f7d5f..466b2a5bc3a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -37,6 +37,9 @@ ENDIF()
 IF(POLICY CMP0054)
   CMAKE_POLICY(SET CMP0054 NEW)
 ENDIF()
+IF(POLICY CMP0075)
+  CMAKE_POLICY(SET CMP0075 NEW)
+ENDIF()
 
 MESSAGE(STATUS "Running cmake version ${CMAKE_VERSION}")
 
diff --git a/zlib/CMakeLists.txt b/zlib/CMakeLists.txt
index 810ec8ae0cb..ee79bc0bd5f 100644
--- a/zlib/CMakeLists.txt
+++ b/zlib/CMakeLists.txt
@@ -13,12 +13,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA
 
-cmake_minimum_required(VERSION 2.4.4)
-set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
-
-project(zlib C)
-
-set(VERSION "1.2.11")
 
 include(CheckTypeSize)
 include(CheckFunctionExists)
@@ -110,40 +104,7 @@ set(ZLIB_SRCS
     zutil.c
 )
 
-if(NOT MINGW)
-    set(ZLIB_DLL_SRCS
-        win32/zlib1.rc # If present will override custom build rule below.
-    )
-endif()
-
-# parse the full version number from zlib.h and include in ZLIB_FULL_VERSION
-file(READ ${CMAKE_CURRENT_SOURCE_DIR}/zlib.h _zlib_h_contents)
-string(REGEX REPLACE ".*#define[ \t]+ZLIB_VERSION[ \t]+\"([-0-9A-Za-z.]+)\".*"
-    "\\1" ZLIB_FULL_VERSION ${_zlib_h_contents})
-
 ADD_CONVENIENCE_LIBRARY(zlib STATIC
   ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS})
 RESTRICT_SYMBOL_EXPORTS(zlib)
 
-
-if(NOT CYGWIN)
-    # This property causes shared libraries on Linux to have the full version
-    # encoded into their final filename.  We disable this on Cygwin because
-    # it causes cygz-${ZLIB_FULL_VERSION}.dll to be created when cygz.dll
-    # seems to be the default.
-    #
-    # This has no effect with MSVC, on that platform the version info for
-    # the DLL comes from the resource file win32/zlib1.rc
-    set_target_properties(zlib PROPERTIES VERSION ${ZLIB_FULL_VERSION})
-endif()
-
-if(CMAKE_SYSTEM_NAME MATCHES "SunOS")
-    # On unix-like platforms the library is almost always called libz
-   set_target_properties(zlib PROPERTIES OUTPUT_NAME z)
-elseif(UNIX)
-    # On unix-like platforms the library is almost always called libz
-   set_target_properties(zlib PROPERTIES OUTPUT_NAME z)
-endif()
-
-
-RESTRICT_SYMBOL_EXPORTS(zlib)