Add proper use of precompiled headers on linux - this removes an approx 50% reduction of total compiletime

--HG--
branch : trunk

src/game/CMakeLists.txt

@@ -1,5 +1,7 @@
-
-########### next target ###############
+# Enable precompiled headers when using the GCC compiler.
+IF(DO_PCH AND CMAKE_COMPILER_IS_GNUCXX)
+        INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})
+ENDIF(DO_PCH AND CMAKE_COMPILER_IS_GNUCXX)
 
 SET(game_STAT_SRCS
    AccountMgr.cpp
@@ -317,6 +319,7 @@ include_directories(
   ${CMAKE_SOURCE_DIR}/src/shared
   ${CMAKE_SOURCE_DIR}/src/shared/vmap
   ${CMAKE_SOURCE_DIR}/src/shared/Database
+  ${CMAKE_SOURCE_DIR}/src/game
   ${MYSQL_INCLUDE_DIR}
 )
 
@@ -343,3 +346,8 @@ endif(NOT DO_SCRIPTS)
 add_library(game STATIC ${game_STAT_SRCS})
 ADD_DEPENDENCIES(game revision.h)
 
+# Generate precompiled header
+IF(DO_PCH AND CMAKE_COMPILER_IS_GNUCXX)
+        ADD_PRECOMPILED_HEADER(game ${CMAKE_SOURCE_DIR}/src/game/pchlinux.h)
+ENDIF(DO_PCH AND CMAKE_COMPILER_IS_GNUCXX)
+

src/game/pchlinux.cpp

@@ -0,0 +1 @@
+#include "pchdef.h"

src/game/pchlinux.h

@@ -0,0 +1,12 @@
+//add here most rarely modified headers to speed up debug build compilation
+#include "WorldSocket.h"                                    // must be first to make ACE happy with ACE includes in it
+#include "Common.h"
+
+#include "MapManager.h"
+#include "Log.h"
+#include "ObjectAccessor.h"
+#include "ObjectDefines.h"
+#include "Database/SQLStorage.h"
+#include "Opcodes.h"
+#include "SharedDefines.h"
+#include "ObjectMgr.h"