Backport of Bug#16809055 MYSQL 5.6 AND 5.7 STILL USE LIBMYSQLCLIENT.SO.18

Backported only the softlink part of the patch,
*not* the bumping of library version.

With this patch, the libmysql/ directory contains:
libmysqlclient.a
libmysqlclient_r.a -> libmysqlclient.a
libmysqlclient_r.so -> libmysqlclient.so*
libmysqlclient_r.so.18 -> libmysqlclient.so.18*
libmysqlclient_r.so.18.0.0 -> libmysqlclient.so.18.0.0*
libmysqlclient.so -> libmysqlclient.so.18*
libmysqlclient.so.18 -> libmysqlclient.so.18.0.0*
libmysqlclient.so.18.0.0*

cmake/install_macros.cmake

-# Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
 # 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -111,28 +111,28 @@ FUNCTION(INSTALL_SCRIPT)
 ENDFUNCTION()
 
 # Install symbolic link to CMake target. 
-# the link is created in the same directory as target
-# and extension will be the same as for target file.
-MACRO(INSTALL_SYMLINK linkname target destination component)
+# We do 'cd path; ln -s target_name link_name'
+# We also add an INSTALL target for "${path}/${link_name}"
+MACRO(INSTALL_SYMLINK target target_name link_name destination component)
 IF(UNIX)
   GET_TARGET_PROPERTY(location ${target} LOCATION)
   GET_FILENAME_COMPONENT(path ${location} PATH)
-  GET_FILENAME_COMPONENT(name ${location} NAME)
-  SET(output ${path}/${linkname})
+
+  SET(output ${path}/${link_name})
   ADD_CUSTOM_COMMAND(
     OUTPUT ${output}
     COMMAND ${CMAKE_COMMAND} ARGS -E remove -f ${output}
     COMMAND ${CMAKE_COMMAND} ARGS -E create_symlink 
-      ${name} 
-      ${linkname}
+      ${target_name} 
+      ${link_name}
     WORKING_DIRECTORY ${path}
     DEPENDS ${target}
     )
   
-  ADD_CUSTOM_TARGET(symlink_${linkname}
+  ADD_CUSTOM_TARGET(symlink_${link_name}
     ALL
     DEPENDS ${output})
-  SET_TARGET_PROPERTIES(symlink_${linkname} PROPERTIES CLEAN_DIRECT_OUTPUT 1)
+  SET_TARGET_PROPERTIES(symlink_${link_name} PROPERTIES CLEAN_DIRECT_OUTPUT 1)
   IF(CMAKE_GENERATOR MATCHES "Xcode")
     # For Xcode, replace project config with install config
     STRING(REPLACE "${CMAKE_CFG_INTDIR}" 

cmake/mysql_version.cmake

-# Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
 # 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,6 +18,7 @@
 #
 
 SET(SHARED_LIB_MAJOR_VERSION "18")
+SET(SHARED_LIB_MINOR_VERSION "0")
 SET(PROTOCOL_VERSION "10")
 SET(DOT_FRM_VERSION "6")
 

libmysql/CMakeLists.txt

-# Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2006, 2014, Oracle and/or its affiliates. All rights reserved.
 # 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -174,6 +174,12 @@ IF(MSVC)
  INSTALL_DEBUG_TARGET(clientlib DESTINATION ${INSTALL_LIBDIR}/debug)
 ENDIF()
 
+MACRO(GET_TARGET_NAME target out_name)
+  GET_TARGET_PROPERTY(location ${target} LOCATION)
+  GET_FILENAME_COMPONENT(name ${location} NAME)
+  SET(${out_name} ${name})
+ENDMACRO()
+
 IF(UNIX)
   MACRO(GET_VERSIONED_LIBNAME LIBNAME EXTENSION VERSION OUTNAME)
     SET(DOT_VERSION ".${VERSION}")
@@ -186,11 +192,19 @@ IF(UNIX)
       SET(${OUTNAME} ${LIBNAME}${EXTENSION}${DOT_VERSION})
     ENDIF() 
   ENDMACRO()
-  INSTALL_SYMLINK(${CMAKE_STATIC_LIBRARY_PREFIX}mysqlclient_r.a mysqlclient ${INSTALL_LIBDIR} Development)
+ENDIF()
+
+IF(UNIX)
+  GET_TARGET_NAME(mysqlclient lib_name)
+  INSTALL_SYMLINK(mysqlclient
+    ${lib_name} ${CMAKE_STATIC_LIBRARY_PREFIX}mysqlclient_r.a
+    ${INSTALL_LIBDIR} Development)
 ENDIF()
 
 IF(NOT DISABLE_SHARED)
-  MERGE_LIBRARIES(libmysql SHARED ${LIBS} EXPORTS ${CLIENT_API_FUNCTIONS} COMPONENT SharedLibraries)
+  MERGE_LIBRARIES(libmysql SHARED ${LIBS}
+    EXPORTS ${CLIENT_API_FUNCTIONS}
+    COMPONENT SharedLibraries)
   IF(UNIX)
     # libtool compatability
     IF(CMAKE_SYSTEM_NAME MATCHES "FreeBSD" OR APPLE)
@@ -198,7 +212,8 @@ IF(NOT DISABLE_SHARED)
     ELSEIF(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
       SET(OS_SHARED_LIB_VERSION "${SHARED_LIB_MAJOR_VERSION}.0")
     ELSE()
-      SET(OS_SHARED_LIB_VERSION "${SHARED_LIB_MAJOR_VERSION}.0.0")
+      SET(OS_SHARED_LIB_VERSION
+        "${SHARED_LIB_MAJOR_VERSION}.${SHARED_LIB_MINOR_VERSION}.0")
     ENDIF()
     # Name of shared library is mysqlclient on Unix
     SET_TARGET_PROPERTIES(libmysql PROPERTIES 
@@ -224,8 +239,13 @@ IF(NOT DISABLE_SHARED)
       "${CMAKE_SHARED_LIBRARY_SUFFIX}"
       ""
       linkname)
-    INSTALL_SYMLINK(${linkname} libmysql ${INSTALL_LIBDIR} SharedLibraries)
-    SET(OS_SHARED_LIB_SYMLINKS "${SHARED_LIB_MAJOR_VERSION}" "${OS_SHARED_LIB_VERSION}")
+    GET_TARGET_NAME(libmysql lib_name)
+    GET_FILENAME_COMPONENT(lib_name_we ${lib_name} NAME_WE)
+    INSTALL_SYMLINK(libmysql
+      ${lib_name} ${linkname}
+      ${INSTALL_LIBDIR} SharedLibraries)
+    SET(OS_SHARED_LIB_SYMLINKS
+      "${SHARED_LIB_MAJOR_VERSION}" "${OS_SHARED_LIB_VERSION}")
     LIST(REMOVE_DUPLICATES OS_SHARED_LIB_SYMLINKS)
     FOREACH(ver ${OS_SHARED_LIB_SYMLINKS})
       GET_VERSIONED_LIBNAME(
@@ -233,7 +253,11 @@ IF(NOT DISABLE_SHARED)
         "${CMAKE_SHARED_LIBRARY_SUFFIX}"
         "${ver}"
         linkname)
-      INSTALL_SYMLINK(${linkname} libmysql ${INSTALL_LIBDIR} SharedLibraries)
+      GET_VERSIONED_LIBNAME(
+        ${lib_name_we} "${CMAKE_SHARED_LIBRARY_SUFFIX}" "${ver}" lib_name_ver)
+      INSTALL_SYMLINK(libmysql
+        ${lib_name_ver} ${linkname}
+        ${INSTALL_LIBDIR} SharedLibraries)
     ENDFOREACH()
   ENDIF()
 ENDIF()