BUG: fix for bug 80, check include cxx now has an optional argument that can is added to the cxx flags

Modules/CheckIncludeFileCXX.cmake

@@ -4,6 +4,7 @@
 # CHECK_INCLUDE_FILE - macro which checks the include file exists.
 # INCLUDE - name of include file
 # VARIABLE - variable to return result
+# OPTIONAL - a third argument can be extra flags which are passed to the compiler
 #
 
 MACRO(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
@@ -12,10 +13,20 @@ MACRO(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
     SET(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
     CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in
       ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.cxx IMMEDIATE)
+    IF(${ARGC} EQUAL 2)
+      SET(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS})
+      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARGV2}")
+    ENDIF(${ARGC} EQUAL 2)
+
     TRY_COMPILE(${VARIABLE}
       ${CMAKE_BINARY_DIR}
       ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.cxx
       OUTPUT_VARIABLE OUTPUT)
+
+    IF(${ARGC} EQUAL 2)
+      SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS_SAVE})
+    ENDIF(${ARGC} EQUAL 2)
+
     IF(${VARIABLE})
       MESSAGE(STATUS "Checking for CXX include file ${INCLUDE} -- found")
       SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")