From ab047793cfe926244d5513e96f86f8126fd67f0e Mon Sep 17 00:00:00 2001
From: kervala <kervala@localhost>
Date: Sun, 4 Dec 2016 19:16:34 +0100
Subject: [PATCH] Fixed: Compatibility with CMake 2.8

---
 code/CMakeModules/PCHSupport.cmake | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/code/CMakeModules/PCHSupport.cmake b/code/CMakeModules/PCHSupport.cmake
index 50853c964..45e1aa766 100644
--- a/code/CMakeModules/PCHSupport.cmake
+++ b/code/CMakeModules/PCHSupport.cmake
@@ -27,6 +27,19 @@ ELSE()
   ENDIF()
 ENDIF()
 
+MACRO(APPEND_DEFINITION _NAME _VAL)
+  # value is not empty
+  IF(${_VAL})
+    IF(CMAKE_VERSION VERSION_LESS "2.8.12")
+      # don't support logical expressions, append definition
+      LIST(APPEND ${_NAME} "-D${_VAL}")
+    ELSE()
+      # support logical expressions, use them
+      LIST(APPEND ${_NAME} "$<$<BOOL:${_VAL}>:-D$<JOIN:${_VAL},-D>>")
+    ENDIF()
+  ENDIF()
+ENDMACRO()
+
 # Set PCH_FLAGS for common flags, PCH_ARCH_XXX_FLAGS for specific archs flags and PCH_ARCHS for archs
 MACRO(PCH_SET_COMPILE_FLAGS _target)
   SET(PCH_FLAGS)
@@ -77,28 +90,28 @@ MACRO(PCH_SET_COMPILE_FLAGS _target)
   GET_DIRECTORY_PROPERTY(DEFINITIONS COMPILE_DEFINITIONS)
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
   GET_DIRECTORY_PROPERTY(DEFINITIONS COMPILE_DEFINITIONS_${_UPPER_BUILD})
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
   GET_DIRECTORY_PROPERTY(DEFINITIONS DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS)
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
   GET_DIRECTORY_PROPERTY(DEFINITIONS DIRECTORY ${CMAKE_SOURCE_DIR} COMPILE_DEFINITIONS_${_UPPER_BUILD})
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
@@ -122,14 +135,14 @@ MACRO(PCH_SET_COMPILE_FLAGS _target)
   GET_TARGET_PROPERTY(DEFINITIONS ${_target} COMPILE_DEFINITIONS)
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
   GET_TARGET_PROPERTY(DEFINITIONS ${_target} COMPILE_DEFINITIONS_${_UPPER_BUILD})
   IF(DEFINITIONS)
     FOREACH(item ${DEFINITIONS})
-      LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+      APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
     ENDFOREACH()
   ENDIF()
 
@@ -151,7 +164,7 @@ MACRO(PCH_SET_COMPILE_FLAGS _target)
 
         IF(_DEFINITIONS)
           FOREACH(item ${_DEFINITIONS})
-            LIST(APPEND GLOBAL_DEFINITIONS "$<$<BOOL:${item}>:-D$<JOIN:${item},-D>>")
+            APPEND_DEFINITION(GLOBAL_DEFINITIONS ${item})
           ENDFOREACH()
         ENDIF()
       ENDIF()