BUG: Run testSystemDir test only if -isystem flag is available.

Tests/Complex/Executable/CMakeLists.txt

@@ -118,10 +118,10 @@ ADD_DEPENDENCIES(notInAllCustom notInAllExe)
 #
 ADD_SUBDIRECTORY(Temp)
 
-IF(CMAKE_COMPILER_IS_GNUCXX)
+IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
   ADD_EXECUTABLE(testSystemDir testSystemDir.cxx)
   SET_TARGET_PROPERTIES(testSystemDir PROPERTIES COMPILE_FLAGS "-Werror")
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
 
 #
 # Extra coverage.Not used.

Tests/ComplexOneConfig/Executable/CMakeLists.txt

@@ -118,10 +118,10 @@ ADD_DEPENDENCIES(notInAllCustom notInAllExe)
 #
 ADD_SUBDIRECTORY(Temp)
 
-IF(CMAKE_COMPILER_IS_GNUCXX)
+IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
   ADD_EXECUTABLE(testSystemDir testSystemDir.cxx)
   SET_TARGET_PROPERTIES(testSystemDir PROPERTIES COMPILE_FLAGS "-Werror")
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
 
 #
 # Extra coverage.Not used.

Tests/ComplexRelativePaths/Executable/CMakeLists.txt

@@ -118,10 +118,10 @@ ADD_DEPENDENCIES(notInAllCustom notInAllExe)
 #
 ADD_SUBDIRECTORY(Temp)
 
-IF(CMAKE_COMPILER_IS_GNUCXX)
+IF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
   ADD_EXECUTABLE(testSystemDir testSystemDir.cxx)
   SET_TARGET_PROPERTIES(testSystemDir PROPERTIES COMPILE_FLAGS "-Werror")
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+ENDIF(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_INCLUDE_SYSTEM_FLAG_CXX)
 
 #
 # Extra coverage.Not used.