Split the GeneratorExpression test into a third part.

Avoid command lines beyond NMake limits.

 http://open.cdash.org/testDetails.php?test=196577461&build=2949683
 expanded command line '...' too long

Tests/GeneratorExpression/CMakeLists.txt

@@ -1,6 +1,9 @@
 cmake_minimum_required (VERSION 2.8.8)
 project(GeneratorExpression CXX)
 
+# This test is split into multiple parts as needed to avoid NMake command
+# length limits.
+
 add_custom_target(check-part1 ALL
   COMMAND ${CMAKE_COMMAND}
     -Dtest_0=$<0:nothing>
@@ -60,7 +63,7 @@ add_custom_target(check-part1 ALL
     -Dtest_colons_4=$<1:C:\\CMake>
     -Dtest_colons_5=$<1:C:/CMake>
     -P ${CMAKE_CURRENT_SOURCE_DIR}/check-part1.cmake
-  COMMAND ${CMAKE_COMMAND} -E echo "check done (part 1 of 2)"
+  COMMAND ${CMAKE_COMMAND} -E echo "check done (part 1 of 3)"
   VERBATIM
   )
 
@@ -130,13 +133,20 @@ add_custom_target(check-part2 ALL
     -Dtest_arbitrary_content_comma_8=$<1:a,,b>
     -Dtest_arbitrary_content_comma_9=$<1:a,,b,,>
     -Dtest_arbitrary_content_comma_10=$<1:,,a,,b,,>
+    -P ${CMAKE_CURRENT_SOURCE_DIR}/check-part2.cmake
+  COMMAND ${CMAKE_COMMAND} -E echo "check done (part 2 of 3)"
+  VERBATIM
+)
+
+add_custom_target(check-part3 ALL
+  COMMAND ${CMAKE_COMMAND}
     -Dtest_version_greater_1=$<VERSION_GREATER:1.0,1.1.1>
     -Dtest_version_greater_2=$<VERSION_GREATER:1.1.1,1.0>
     -Dtest_version_less_1=$<VERSION_LESS:1.1.1,1.0>
     -Dtest_version_less_2=$<VERSION_LESS:1.0,1.1.1>
     -Dtest_version_equal_1=$<VERSION_EQUAL:1.0.1,1.1>
     -Dtest_version_equal_2=$<VERSION_EQUAL:1.1,1.1>
-    -P ${CMAKE_CURRENT_SOURCE_DIR}/check-part2.cmake
-  COMMAND ${CMAKE_COMMAND} -E echo "check done (part 2 of 2)"
+    -P ${CMAKE_CURRENT_SOURCE_DIR}/check-part3.cmake
+  COMMAND ${CMAKE_COMMAND} -E echo "check done (part 3 of 3)"
   VERBATIM
   )

Tests/GeneratorExpression/check-part2.cmake

@@ -44,9 +44,3 @@ check(test_arbitrary_content_comma_7 ",,a")
 check(test_arbitrary_content_comma_8 "a,,b")
 check(test_arbitrary_content_comma_9 "a,,b,,")
 check(test_arbitrary_content_comma_10 ",,a,,b,,")
-check(test_version_greater_1 "0")
-check(test_version_greater_2 "1")
-check(test_version_less_1 "0")
-check(test_version_less_2 "1")
-check(test_version_equal_1 "0")
-check(test_version_equal_2 "1")

Tests/GeneratorExpression/check-part3.cmake

@@ -0,0 +1,9 @@
+
+include(${CMAKE_CURRENT_LIST_DIR}/check-common.cmake)
+
+check(test_version_greater_1 "0")
+check(test_version_greater_2 "1")
+check(test_version_less_1 "0")
+check(test_version_less_2 "1")
+check(test_version_equal_1 "0")
+check(test_version_equal_2 "1")