Fixed nmake parameter.
Disabled debug_* targets for MSVC_IDE (they already exist).
Removed the make usage message for MSVC_IDE.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 36b2be9..0c068e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,6 +142,7 @@
 endif(EIGEN_BUILD_BTL)
 
 ei_testing_print_summary()
+if(NOT MSVC_IDE)
 message("")
 message("Configured Eigen ${EIGEN_VERSION_NUMBER}")
 message("You can now do the following:")
@@ -158,3 +159,4 @@
 message("make blas     | Build BLAS library (not the same thing as Eigen)")
 message("make doc      | Generate the API documentation, requires Doxygen & LaTeX")
 message("--------------+----------------------------------------------------------------")
+endif(NOT MSVC_IDE)

cmake/EigenTesting.cmake

diff --git a/cmake/EigenTesting.cmake b/cmake/EigenTesting.cmake
index 8f50b33..b8e159b 100644
--- a/cmake/EigenTesting.cmake
+++ b/cmake/EigenTesting.cmake
@@ -40,18 +40,24 @@
 macro(ei_add_test testname)
 
   set(targetname test_${testname})
-  set(debug_targetname debug_${testname})
+  if(NOT MSVC_IDE)
+    set(debug_targetname debug_${testname})
+  endif(NOT MSVC_IDE)
 
   set(filename ${testname}.cpp)
   add_executable(${targetname} ${filename})
   add_dependencies(btest ${targetname})
-  add_executable(${debug_targetname} EXCLUDE_FROM_ALL ${filename})
+  if(NOT MSVC_IDE)
+    add_executable(${debug_targetname} EXCLUDE_FROM_ALL ${filename})
+  endif(NOT MSVC_IDE)
 
   if(NOT EIGEN_NO_ASSERTION_CHECKING)
 
     if(MSVC)
       set_target_properties(${targetname} PROPERTIES COMPILE_FLAGS "/EHsc")
-      set_target_properties(${debug_targetname} PROPERTIES COMPILE_FLAGS "/EHsc")
+      if(NOT MSVC_IDE)
+        set_target_properties(${debug_targetname} PROPERTIES COMPILE_FLAGS "/EHsc")
+      endif(NOT MSVC_IDE)
     else(MSVC)
       set_target_properties(${targetname} PROPERTIES COMPILE_FLAGS "-fexceptions")
       set_target_properties(${debug_targetname} PROPERTIES COMPILE_FLAGS "-fexceptions")
@@ -60,13 +66,17 @@
     option(EIGEN_DEBUG_ASSERTS "Enable debuging of assertions" OFF)
     if(EIGEN_DEBUG_ASSERTS)
       ei_add_target_property(${targetname} COMPILE_FLAGS "-DEIGEN_DEBUG_ASSERTS=1")
-      ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_DEBUG_ASSERTS=1")
+      if(NOT MSVC_IDE)
+        ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_DEBUG_ASSERTS=1")
+      endif(NOT MSVC_IDE)
     endif(EIGEN_DEBUG_ASSERTS)
 
   else(NOT EIGEN_NO_ASSERTION_CHECKING)
 
     ei_add_target_property(${targetname} COMPILE_FLAGS "-DEIGEN_NO_ASSERTION_CHECKING=1")
-    ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_NO_ASSERTION_CHECKING=1")
+    if(NOT MSVC_IDE)
+      ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_NO_ASSERTION_CHECKING=1")
+    endif(NOT MSVC_IDE)
 
   endif(NOT EIGEN_NO_ASSERTION_CHECKING)
 
@@ -80,11 +90,15 @@
     # O0 is in principle redundant here, but doesn't hurt
     ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-O0 -g3")
   elseif(MSVC)
-    ei_add_target_property(${debug_targetname} COMPILE_FLAGS "/Od /Zi")
+    if(NOT MSVC_IDE)
+      ei_add_target_property(${debug_targetname} COMPILE_FLAGS "/Od /Zi")
+    endif(NOT MSVC_IDE)
   endif(CMAKE_COMPILER_IS_GNUCXX)
 
   ei_add_target_property(${targetname} COMPILE_FLAGS "-DEIGEN_TEST_FUNC=${testname}")
-  ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_TEST_FUNC=${testname}")
+  if(NOT MSVC_IDE)
+    ei_add_target_property(${debug_targetname} COMPILE_FLAGS "-DEIGEN_TEST_FUNC=${testname}")
+  endif(NOT MSVC_IDE)
 
   target_link_libraries(${targetname} ${EXTERNAL_LIBS})
   if(${ARGC} GREATER 2)
@@ -92,7 +106,9 @@
     string(LENGTH "${ARGV2_stripped}" ARGV2_stripped_length)
     if(${ARGV2_stripped_length} GREATER 0)
       target_link_libraries(${targetname} ${ARGV2})
-      target_link_libraries(${debug_targetname} ${ARGV2})
+      if(NOT MSVC_IDE)
+        target_link_libraries(${debug_targetname} ${ARGV2})
+      endif(NOT MSVC_IDE)
     endif(${ARGV2_stripped_length} GREATER 0)
   endif(${ARGC} GREATER 2)
 

test/testsuite.cmake

diff --git a/test/testsuite.cmake b/test/testsuite.cmake
index b223345..5d0cb65 100644
--- a/test/testsuite.cmake
+++ b/test/testsuite.cmake
@@ -175,7 +175,7 @@
   else(EIGEN_GENERATOR_TYPE)
     set(CTEST_CMAKE_COMMAND "${CTEST_CMAKE_COMMAND} -G \"NMake Makefiles\" -DCMAKE_MAKE_PROGRAM=nmake")
     SET (CTEST_INITIAL_CACHE "
-      MAKECOMMAND:STRING=nmake -i
+      MAKECOMMAND:STRING=nmake /i
       CMAKE_MAKE_PROGRAM:FILEPATH=nmake
       CMAKE_GENERATOR:INTERNAL=NMake Makefiles
       CMAKE_BUILD_TYPE:STRING=Release