ENH: add mingw test to cxx

Modules/CMakeDetermineCXXCompiler.cmake

@@ -61,7 +61,13 @@ IF(NOT CMAKE_COMPILER_IS_GNUCXX_RUN)
       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
         "Determining if the C++ compiler is GNU failed with "
         "the following output:\n${CMAKE_COMPILER_OUTPUT}\n\n")
-    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
+    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" ) 
+    IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_MINGW.*" )
+      SET(CMAKE_COMPILER_IS_MINGW 1)
+    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_MINGW.*" )
+    IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
+      SET(CMAKE_COMPILER_IS_CYGWIN 1)
+    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
   ENDIF(NOT CMAKE_COMPILER_RETURN)
 ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX_RUN)