Add macro for checking if a swequence of includes can be includes

Modules/CheckIncludeFiles.cmake

@@ -0,0 +1,40 @@
+#
+# Check if the files can be included
+#
+# CHECK_INCLUDE_FILES - macro which checks the include file exists.
+# INCLUDE - list of files to include
+# VARIABLE - variable to return result
+#
+
+MACRO(CHECK_INCLUDE_FILES INCLUDE VARIABLE)
+  IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+    SET(CHECK_INCLUDE_FILES_CONTENT "/* */\n")
+    STRING(ASCII 35 POUND)
+    STRING(ASCII 40 41 PARENTS)
+    FOREACH(FILE ${INCLUDE})
+      SET(CHECK_INCLUDE_FILES_CONTENT
+            "${CHECK_INCLUDE_FILES_CONTENT}${POUND}include <${FILE}>\n")
+    ENDFOREACH(FILE)
+    SET(CHECK_INCLUDE_FILES_CONTENT
+        "${CHECK_INCLUDE_FILES_CONTENT}\n\nvoid main${PARENTS}{}\n")
+    WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFiles.c 
+               "${CHECK_INCLUDE_FILES_CONTENT}")
+    
+    MESSAGE(STATUS "Looking for set of ${INCLUDE}")
+    TRY_COMPILE(${VARIABLE}
+               ${CMAKE_BINARY_DIR}
+               ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFiles.c
+               OUTPUT_VARIABLE OUTPUT)
+    IF(${VARIABLE})
+      MESSAGE(STATUS "Looking for set of ${INCLUDE} - found")
+      SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
+    ELSE(${VARIABLE})
+      MESSAGE(STATUS "Looking for set of ${INCLUDE} - not found.")
+      SET(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
+      WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log 
+        "Determining if files ${INCLUDE} "
+        "exist failed with the following output:\n"
+        "${OUTPUT}\n" APPEND)
+    ENDIF(${VARIABLE})
+  ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ENDMACRO(CHECK_INCLUDE_FILES)