Buildsystem/CMake: Add the ability to avoid linking the core with jemalloc on linux through using the -DNOJEM parameter.

WARNING: This is a developer flag only, and as such NOT documented elsewhere - we need this for valgrind and related tools.
Again : YOU HAVE BEEN WARNED! DO NOT USE THIS FLAG UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!

cmake/platform/unix/settings.cmake

@@ -1,6 +1,8 @@
 # Package overloads - Linux
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
-  set(JEMALLOC_LIBRARY "jemalloc")
+  if (NOT NOJEM)
+    set(JEMALLOC_LIBRARY "jemalloc")
+  endif()
 endif()
 
 # set default configuration directory

cmake/showoptions.cmake

@@ -78,4 +78,10 @@ if( WIN32 )
   endif()
 endif( WIN32 )
 
-message("")
+if ( NOJEM )
+  message("")
+  message("*** WARNING: jemalloc linking has been disabled!")
+  message("*** Please note that this is for DEBUGGING WITH VALGRIND only!")
+  message("*** DO NOT DISABLE IT UNLESS YOU KNOW WHAT YOU'RE DOING!")
+endif()
+  message("")

dep/CMakeLists.txt

@@ -15,7 +15,7 @@ elseif( MSVC )
 endif()
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
-  if(SERVERS)
+  if(SERVERS AND NOT NOJEM)
     add_subdirectory(jemalloc)  
   endif()
 endif()

src/server/worldserver/CMakeLists.txt

@@ -201,4 +201,3 @@ if( USE_COREPCH )
     add_native_precompiled_header(worldserver ${CMAKE_CURRENT_SOURCE_DIR}/PrecompiledHeaders/worldPCH)
   endif()
 endif()
-