Merge topic 'use_generator_is_multi_config'

3c413e2a GENERATOR_IS_MULTI_CONFIG: Use for multi-config checks in Modules
c267ea1c GENERATOR_IS_MULTI_CONFIG: Use for multi-config checks in Tests

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1627

47 files changed, 176 insertions, 102 deletions

diff --git a/Modules/CMakeExpandImportedTargets.cmake b/Modules/CMakeExpandImportedTargets.cmake
index ad065f0..21a3065 100644
--- a/Modules/CMakeExpandImportedTargets.cmake
+++ b/Modules/CMakeExpandImportedTargets.cmake
@@ -50,6 +50,10 @@ function(CMAKE_EXPAND_IMPORTED_TARGETS _RESULT )
    endif()
 
    if(NOT CEIT_CONFIGURATION)
+      # Would be better to test GENERATOR_IS_MULTI_CONFIG global property,
+      # but the documented behavior specifically says we check
+      # CMAKE_CONFIGURATION_TYPES and fall back to CMAKE_BUILD_TYPE if no
+      # config types are defined.
       if(CMAKE_CONFIGURATION_TYPES)
          list(GET CMAKE_CONFIGURATION_TYPES 0 CEIT_CONFIGURATION)
       else()
diff --git a/Modules/CTestTargets.cmake b/Modules/CTestTargets.cmake
index 1d1d14c..838fbbf 100644
--- a/Modules/CTestTargets.cmake
+++ b/Modules/CTestTargets.cmake
@@ -38,7 +38,8 @@ endif()
 #
 
 set(__conf_types "")
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   # We need to pass the configuration type on the test command line.
   set(__conf_types -C "${CMAKE_CFG_INTDIR}")
 endif()
diff --git a/Modules/DeployQt4.cmake b/Modules/DeployQt4.cmake
index 8ada451..28054f8 100644
--- a/Modules/DeployQt4.cmake
+++ b/Modules/DeployQt4.cmake
@@ -259,7 +259,8 @@ function(install_qt4_plugin_path plugin executable copy installed_plugin_path_va
                         file(MAKE_DIRECTORY "${plugins_path}")
                         file(COPY "${plugin}" DESTINATION "${plugins_path}")
                 else()
-                        if(configurations AND (CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE))
+                        get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+                        if(configurations AND (_isMultiConfig OR CMAKE_BUILD_TYPE))
                                 set(configurations CONFIGURATIONS ${configurations})
                         else()
                                 unset(configurations)
@@ -295,7 +296,8 @@ function(install_qt4_plugin plugin executable copy installed_plugin_path_var)
                         set(plugin_debug "${plugin_release}")
                 endif()
 
-                if(CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE)
+                get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+                if(_isMultiConfig OR CMAKE_BUILD_TYPE)
                         install_qt4_plugin_path("${plugin_release}" "${executable}" "${copy}" "${installed_plugin_path_var}_release" "${plugins_dir}" "${component}" "Release|RelWithDebInfo|MinSizeRel")
                         install_qt4_plugin_path("${plugin_debug}" "${executable}" "${copy}" "${installed_plugin_path_var}_debug" "${plugins_dir}" "${component}" "Debug")
 
diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index 30626f1..30176bb 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -1790,7 +1790,8 @@ function(_ep_get_build_command name step cmd_var)
         set(cmd "${CMAKE_COMMAND}")
       endif()
       set(args --build ".")
-      if(CMAKE_CONFIGURATION_TYPES)
+      get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+      if(_isMultiConfig)
         if (CMAKE_CFG_INTDIR AND
             NOT CMAKE_CFG_INTDIR STREQUAL "." AND
             NOT CMAKE_CFG_INTDIR MATCHES "\\$")
@@ -1815,7 +1816,7 @@ function(_ep_get_build_command name step cmd_var)
       if("x${step}x" STREQUAL "xTESTx")
         string(REGEX REPLACE "^(.*/)cmake([^/]*)$" "\\1ctest\\2" cmd "${cmd}")
         set(args "")
-        if(CMAKE_CONFIGURATION_TYPES)
+        if(_isMultiConfig)
           list(APPEND args -C ${config})
         endif()
       endif()
@@ -1955,7 +1956,8 @@ endfunction()
 #
 function(_ep_get_configuration_subdir_suffix suffix_var)
   set(suffix "")
-  if(CMAKE_CONFIGURATION_TYPES)
+  get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+  if(_isMultiConfig)
     set(suffix "/${CMAKE_CFG_INTDIR}")
   endif()
   set(${suffix_var} "${suffix}" PARENT_SCOPE)
@@ -2085,7 +2087,8 @@ function(ExternalProject_Add_Step name step)
     set_property(SOURCE ${stamp_file} PROPERTY SYMBOLIC 1)
     set(touch)
     # Remove any existing stamp in case the option changed in an existing tree.
-    if(CMAKE_CONFIGURATION_TYPES)
+    get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+    if(_isMultiConfig)
       foreach(cfg ${CMAKE_CONFIGURATION_TYPES})
         string(REPLACE "/${CMAKE_CFG_INTDIR}" "/${cfg}" stamp_file_config "${stamp_file}")
         file(REMOVE ${stamp_file_config})
diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index 0786248..a0fd90f 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -275,13 +275,14 @@ endif()
 macro(_Boost_ADJUST_LIB_VARS basename)
   if(Boost_INCLUDE_DIR )
     if(Boost_${basename}_LIBRARY_DEBUG AND Boost_${basename}_LIBRARY_RELEASE)
-      # if the generator supports configuration types then set
-      # optimized and debug libraries, or if the CMAKE_BUILD_TYPE has a value
-      if(CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE)
+      # if the generator is multi-config or if CMAKE_BUILD_TYPE is set for
+      # single-config generators, set optimized and debug libraries
+      get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+      if(_isMultiConfig OR CMAKE_BUILD_TYPE)
         set(Boost_${basename}_LIBRARY optimized ${Boost_${basename}_LIBRARY_RELEASE} debug ${Boost_${basename}_LIBRARY_DEBUG})
       else()
-        # if there are no configuration types and CMAKE_BUILD_TYPE has no value
-        # then just use the release libraries
+        # For single-config generators where CMAKE_BUILD_TYPE has no value,
+        # just use the release libraries
         set(Boost_${basename}_LIBRARY ${Boost_${basename}_LIBRARY_RELEASE} )
       endif()
       # FIXME: This probably should be set for both cases
diff --git a/Modules/FindCUDA.cmake b/Modules/FindCUDA.cmake
index 7d000c0..4f4453b 100644
--- a/Modules/FindCUDA.cmake
+++ b/Modules/FindCUDA.cmake
@@ -578,12 +578,15 @@ mark_as_advanced(
   CUDA_SEPARABLE_COMPILATION
   )
 
-# Makefile and similar generators don't define CMAKE_CONFIGURATION_TYPES, so we
-# need to add another entry for the CMAKE_BUILD_TYPE.  We also need to add the
-# standerd set of 4 build types (Debug, MinSizeRel, Release, and RelWithDebInfo)
-# for completeness.  We need run this loop in order to accommodate the addition
-# of extra configuration types.  Duplicate entries will be removed by
-# REMOVE_DUPLICATES.
+# Single config generators like Makefiles or Ninja don't usually have
+# CMAKE_CONFIGURATION_TYPES defined (but note that it can be defined if set by
+# projects or developers). Even CMAKE_BUILD_TYPE might not be defined for
+# single config generators (and should not be defined for multi-config
+# generators). To ensure we get a complete superset of all possible
+# configurations, we combine CMAKE_CONFIGURATION_TYPES, CMAKE_BUILD_TYPE and
+# all of the standard configurations, then weed out duplicates with
+# list(REMOVE_DUPLICATES). Looping over the unique set then ensures we have
+# each configuration-specific set of nvcc flags defined and marked as advanced.
 set(CUDA_configuration_types ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE} Debug MinSizeRel Release RelWithDebInfo)
 list(REMOVE_DUPLICATES CUDA_configuration_types)
 foreach(config ${CUDA_configuration_types})
diff --git a/Modules/FindQt4.cmake b/Modules/FindQt4.cmake
index 714e4af..a65c533 100644
--- a/Modules/FindQt4.cmake
+++ b/Modules/FindQt4.cmake
@@ -398,13 +398,14 @@ macro (_QT4_ADJUST_LIB_VARS _camelCaseBasename)
 
       # if the release- as well as the debug-version of the library have been found:
       if (QT_${basename}_LIBRARY_DEBUG AND QT_${basename}_LIBRARY_RELEASE)
-        # if the generator supports configuration types then set
-        # optimized and debug libraries, or if the CMAKE_BUILD_TYPE has a value
-        if (CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE)
+        # if the generator is multi-config or if CMAKE_BUILD_TYPE is set for
+        # single-config generators, set optimized and debug libraries
+        get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+        if(_isMultiConfig OR CMAKE_BUILD_TYPE)
           set(QT_${basename}_LIBRARY       optimized ${QT_${basename}_LIBRARY_RELEASE} debug ${QT_${basename}_LIBRARY_DEBUG})
         else()
-          # if there are no configuration types and CMAKE_BUILD_TYPE has no value
-          # then just use the release libraries
+          # For single-config generators where CMAKE_BUILD_TYPE has no value,
+          # just use the release libraries
           set(QT_${basename}_LIBRARY       ${QT_${basename}_LIBRARY_RELEASE} )
         endif()
         set(QT_${basename}_LIBRARIES       optimized ${QT_${basename}_LIBRARY_RELEASE} debug ${QT_${basename}_LIBRARY_DEBUG})
diff --git a/Modules/SelectLibraryConfigurations.cmake b/Modules/SelectLibraryConfigurations.cmake
index dce6f99..fe3bb00 100644
--- a/Modules/SelectLibraryConfigurations.cmake
+++ b/Modules/SelectLibraryConfigurations.cmake
@@ -38,11 +38,12 @@ macro( select_library_configurations basename )
         set(${basename}_LIBRARY_DEBUG "${basename}_LIBRARY_DEBUG-NOTFOUND" CACHE FILEPATH "Path to a library.")
     endif()
 
+    get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
     if( ${basename}_LIBRARY_DEBUG AND ${basename}_LIBRARY_RELEASE AND
            NOT ${basename}_LIBRARY_DEBUG STREQUAL ${basename}_LIBRARY_RELEASE AND
-           ( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE ) )
-        # if the generator supports configuration types or CMAKE_BUILD_TYPE
-        # is set, then set optimized and debug options.
+           ( _isMultiConfig OR CMAKE_BUILD_TYPE ) )
+        # if the generator is multi-config or if CMAKE_BUILD_TYPE is set for
+        # single-config generators, set optimized and debug libraries
         set( ${basename}_LIBRARY "" )
         foreach( _libname IN LISTS ${basename}_LIBRARY_RELEASE )
             list( APPEND ${basename}_LIBRARY optimized "${_libname}" )
diff --git a/Tests/CMakeBuildTest.cmake.in b/Tests/CMakeBuildTest.cmake.in
index 71bcb18..b4b1286 100644
--- a/Tests/CMakeBuildTest.cmake.in
+++ b/Tests/CMakeBuildTest.cmake.in
@@ -29,11 +29,10 @@ if(RESULT)
   message(FATAL_ERROR "Error running cmake --build")
 endif()
 
-# check for configuration types
-set(CMAKE_CONFIGURATION_TYPES @CMAKE_CONFIGURATION_TYPES@)
-# run the executable out of the Debug directory if there
-# are configuration types
-if(CMAKE_CONFIGURATION_TYPES)
+# run the executable out of the Debug directory if using a
+# multi-config generator
+set(_isMultiConfig @_isMultiConfig@)
+if(_isMultiConfig)
   set(RUN_TEST "@CMAKE_BUILD_TEST_BINARY_DIR@/Debug/@CMAKE_BUILD_TEST_EXE@")
 else()
   set(RUN_TEST "@CMAKE_BUILD_TEST_BINARY_DIR@/@CMAKE_BUILD_TEST_EXE@")
diff --git a/Tests/CMakeInstall.cmake b/Tests/CMakeInstall.cmake
index fda8c54..d9d85f7 100644
--- a/Tests/CMakeInstall.cmake
+++ b/Tests/CMakeInstall.cmake
@@ -14,7 +14,18 @@ if(CMake_TEST_INSTALL)
   set(CMake_TEST_INSTALL_PREFIX ${CMake_BINARY_DIR}/Tests/CMakeInstall)
   set(CMAKE_INSTALL_PREFIX "${CMake_TEST_INSTALL_PREFIX}")
 
-  if(CMAKE_CONFIGURATION_TYPES)
+  # 3.9 or later provides a definitive answer to whether we are multi-config
+  # through a global property. Prior to 3.9, CMAKE_CONFIGURATION_TYPES being set
+  # is assumed to mean multi-config, but developers might modify it so it is
+  # technically not as reliable.
+  if(NOT CMAKE_VERSION VERSION_LESS 3.9)
+    get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+  elseif(CMAKE_CONFIGURATION_TYPES)
+    set(_isMultiConfig True)
+  else()
+    set(_isMultiConfig False)
+  endif()
+  if(_isMultiConfig)
     # There are multiple configurations.  Make sure the tested
     # configuration is the one that is installed.
     set(CMake_TEST_INSTALL_CONFIG --config $<CONFIGURATION>)
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 5d8c2fe..fb7313f 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -38,9 +38,21 @@ set(ENV{HOME} \"${TEST_HOME}\")
 ")
 endif()
 
+# 3.9 or later provides a definitive answer to whether we are multi-config
+# through a global property. Prior to 3.9, CMAKE_CONFIGURATION_TYPES being set
+# is assumed to mean multi-config, but developers might modify it so it is
+# technically not as reliable.
+if(NOT CMAKE_VERSION VERSION_LESS 3.9)
+  get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+elseif(CMAKE_CONFIGURATION_TYPES)
+  set(_isMultiConfig True)
+else()
+  set(_isMultiConfig False)
+endif()
+
 # Choose a default configuration for CTest tests.
 set(CTestTest_CONFIG Debug)
-if(NOT CMAKE_CONFIGURATION_TYPES AND CMAKE_BUILD_TYPE)
+if(NOT _isMultiConfig AND CMAKE_BUILD_TYPE)
   set(CTestTest_CONFIG ${CMAKE_BUILD_TYPE})
 endif()
 
@@ -3190,7 +3202,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
           OUTPUT_QUIET ERROR_QUIET RESULT_VARIABLE _result
           )
         if(_result EQUAL 0)
-          if(CMAKE_CONFIGURATION_TYPES)
+          if(_isMultiConfig)
             set (JAVAH_LIBRARY_PATH ${CMake_BINARY_DIR}/Tests/JavaJavah/$<CONFIGURATION>)
           else()
             set (JAVAH_LIBRARY_PATH ${CMake_BINARY_DIR}/Tests/JavaJavah)
diff --git a/Tests/CMakeOnly/SelectLibraryConfigurations/CMakeLists.txt b/Tests/CMakeOnly/SelectLibraryConfigurations/CMakeLists.txt
index 6d1628a..3676b17 100644
--- a/Tests/CMakeOnly/SelectLibraryConfigurations/CMakeLists.txt
+++ b/Tests/CMakeOnly/SelectLibraryConfigurations/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.9)
 
 project(SelectLibraryConfigurations NONE)
 
@@ -15,7 +15,8 @@ macro(check_slc basename expect)
   endif ()
 endmacro(check_slc)
 
-if (NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_BUILD_TYPE)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if (NOT _isMultiConfig AND NOT CMAKE_BUILD_TYPE)
   set(NOTYPE_RELONLY_LIBRARY_RELEASE "opt")
   check_slc(NOTYPE_RELONLY "opt")
 
diff --git a/Tests/CTestConfig/CMakeLists.txt b/Tests/CTestConfig/CMakeLists.txt
index f46d89a..8c19adb 100644
--- a/Tests/CTestConfig/CMakeLists.txt
+++ b/Tests/CTestConfig/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.9)
 project(CTestConfig)
 
 include(CTest)
@@ -8,32 +8,41 @@ include(CTest)
 # 'ctest -S script.cmake' call.
 #
 # In either case, we expect CMAKE_BUILD_TYPE to be defined for single-configuration
-# build trees and not defined for multi-configuration build trees.
+# build trees and not defined for multi-configuration build trees. The value of
+# CMAKE_CONFIGURATION_TYPES should not be relied upon to determine whether we
+# are using a multi-config generator or not, the GENERATOR_IS_MULTI_CONFIG
+# global property is the canonical way to do that as of CMake 3.9.
 #
-if(CMAKE_CONFIGURATION_TYPES)
-  # multi-configuration: expect not defined, error if defined
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
+  if(NOT DEFINED CMAKE_CONFIGURATION_TYPES OR CMAKE_CONFIGURATION_TYPES STREQUAL "")
+    message(FATAL_ERROR "CMAKE_CONFIGURATION_TYPES is not defined or is empty "
+        "(but must be defined and non-empty for a multi-configuration generator)")
+  endif()
   if(DEFINED CMAKE_BUILD_TYPE AND NOT CMAKE_BUILD_TYPE STREQUAL "")
-    message(FATAL_ERROR "CMAKE_CONFIGURATION_TYPES='${CMAKE_CONFIGURATION_TYPES}' CMAKE_BUILD_TYPE='${CMAKE_BUILD_TYPE}' is defined and non-empty (but should not be for a multi-configuration generator)")
+    message(FATAL_ERROR "CMAKE_BUILD_TYPE='${CMAKE_BUILD_TYPE}' is defined and non-empty "
+        "(but should not be for a multi-configuration generator)")
   endif()
+  set(_configs ${CMAKE_CONFIGURATION_TYPES})
 else()
-  # single-configuration: expect defined, error if not defined
+  # Populating CMAKE_CONFIGURATION_TYPES even for single config generators is
+  # common enough for user projects that we don't want to consider it an error.
+  # We just need CMAKE_BUILD_TYPE to be set and ignore CMAKE_CONFIGURATION_TYPES.
   if(NOT DEFINED CMAKE_BUILD_TYPE OR CMAKE_BUILD_TYPE STREQUAL "")
-    message(FATAL_ERROR "CMAKE_BUILD_TYPE is not defined or is empty (but should be defined and non-empty for a single-configuration generator)")
+    message(FATAL_ERROR "CMAKE_BUILD_TYPE is not defined or is empty "
+        "(but should be defined and non-empty for a single-configuration generator)")
   endif()
-endif()
-
-
-if(DEFINED CMAKE_BUILD_TYPE AND NOT CMAKE_BUILD_TYPE STREQUAL "")
   add_definitions(-DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE}")
+  set(_configs ${CMAKE_BUILD_TYPE})
 endif()
 
 add_executable(ctc CTestConfig.cxx)
 
 
-foreach(cfg ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE})
+foreach(cfg ${_configs})
   add_test(NAME ctc-${cfg} CONFIGURATIONS ${cfg} COMMAND ctc --config $<CONFIGURATION>)
 
-  if(CMAKE_CONFIGURATION_TYPES)
+  if(_isMultiConfig)
     set_property(TEST ctc-${cfg}
       PROPERTY PASS_REGULAR_EXPRESSION "CMAKE_INTDIR is ${cfg}")
     set_property(TEST ctc-${cfg}
diff --git a/Tests/CTestConfig/dashboard.cmake.in b/Tests/CTestConfig/dashboard.cmake.in
index 143fe71..4bb1262 100644
--- a/Tests/CTestConfig/dashboard.cmake.in
+++ b/Tests/CTestConfig/dashboard.cmake.in
@@ -1,4 +1,4 @@
-set(CMAKE_CONFIGURATION_TYPES "@CMAKE_CONFIGURATION_TYPES@")
+set(_isMultiConfig "@_isMultiConfig@")
 set(CTEST_SOURCE_DIRECTORY "@CMake_SOURCE_DIR@/Tests/CTestConfig")
 set(CTEST_BINARY_DIRECTORY "@CMake_BINARY_DIR@/Tests/CTestConfig/@cfg@-dashboard")
 
@@ -11,7 +11,7 @@ message("CMAKE_COMMAND='${CMAKE_COMMAND}'")
 message("CMAKE_CTEST_COMMAND='${CMAKE_CTEST_COMMAND}'")
 
 set(arg "")
-if(NOT CMAKE_CONFIGURATION_TYPES)
+if(NOT _isMultiConfig)
   set(arg "-DCMAKE_BUILD_TYPE:STRING=@cfg@")
 endif()
 
diff --git a/Tests/CustomCommandByproducts/CMakeLists.txt b/Tests/CustomCommandByproducts/CMakeLists.txt
index 3289e8f..d0bf648 100644
--- a/Tests/CustomCommandByproducts/CMakeLists.txt
+++ b/Tests/CustomCommandByproducts/CMakeLists.txt
@@ -1,4 +1,5 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.9)
+cmake_policy(SET CMP0058 OLD)
 project(CustomCommandByproducts C)
 
 # Generate a byproduct in a rule that runs in the target consuming it.
@@ -81,7 +82,8 @@ add_custom_command(OUTPUT timestamp8.txt
 
 # Generate the library file of an imported target as a byproduct
 # of an external project.
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(cfg /${CMAKE_CFG_INTDIR})
 else()
   set(cfg)
@@ -105,7 +107,7 @@ add_dependencies(ExternalLibrary ExternalTarget)
 # Generate the library file of an imported target as a byproduct
 # of an external project. The byproduct uses <BINARY_DIR> that is substituted
 # by the real binary path
-if(CMAKE_CONFIGURATION_TYPES)
+if(_isMultiConfig)
   set(cfg /${CMAKE_CFG_INTDIR})
 else()
   set(cfg)
diff --git a/Tests/ExportImport/CMakeLists.txt b/Tests/ExportImport/CMakeLists.txt
index eaad3d4..dc621eb 100644
--- a/Tests/ExportImport/CMakeLists.txt
+++ b/Tests/ExportImport/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.7.20090711)
+cmake_minimum_required (VERSION 3.9)
 project(ExportImport C CXX)
 if(NOT DEFINED CMake_TEST_NESTED_MAKE_PROGRAM AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
   set(CMake_TEST_NESTED_MAKE_PROGRAM "${CMAKE_MAKE_PROGRAM}")
@@ -15,7 +15,8 @@ set_property(
   PROPERTY SYMBOLIC 1
   )
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(NESTED_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
 else()
   if(CMAKE_BUILD_TYPE)
diff --git a/Tests/FortranModules/CMakeLists.txt b/Tests/FortranModules/CMakeLists.txt
index 3996600..d056b43 100644
--- a/Tests/FortranModules/CMakeLists.txt
+++ b/Tests/FortranModules/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.1)
+cmake_minimum_required (VERSION 3.9)
 project(FortranModules Fortran)
 
 if(NOT DEFINED CMake_TEST_NESTED_MAKE_PROGRAM AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
@@ -56,7 +56,8 @@ add_executable(test_non_pp_include test_non_pp_include_main.f90)
 
 # Build the external project separately using a custom target.
 # Make sure it uses the same build configuration as this test.
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(External_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
   set(External_BUILD_TYPE)
 else()
diff --git a/Tests/JavaExportImport/CMakeLists.txt b/Tests/JavaExportImport/CMakeLists.txt
index a075301..c70704a 100644
--- a/Tests/JavaExportImport/CMakeLists.txt
+++ b/Tests/JavaExportImport/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.5)
+cmake_minimum_required (VERSION 3.9)
 project(JavaExportImport)
 if(NOT DEFINED CMake_TEST_NESTED_MAKE_PROGRAM AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
   set(CMake_TEST_NESTED_MAKE_PROGRAM "${CMAKE_MAKE_PROGRAM}")
@@ -17,7 +17,8 @@ set_property(
   PROPERTY SYMBOLIC 1
   )
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(NESTED_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
 else()
   if(CMAKE_BUILD_TYPE)
diff --git a/Tests/MacRuntimePath/CMakeLists.txt b/Tests/MacRuntimePath/CMakeLists.txt
index 3e9ab8a..a3c6fd9 100644
--- a/Tests/MacRuntimePath/CMakeLists.txt
+++ b/Tests/MacRuntimePath/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8)
+cmake_minimum_required (VERSION 3.9)
 project(MacRuntimePath)
 if(NOT DEFINED CMake_TEST_NESTED_MAKE_PROGRAM AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
   set(CMake_TEST_NESTED_MAKE_PROGRAM "${CMAKE_MAKE_PROGRAM}")
@@ -18,7 +18,8 @@ set_property(
 configure_file(${MacRuntimePath_SOURCE_DIR}/InitialCache.cmake.in
                ${MacRuntimePath_BINARY_DIR}/InitialCache.cmake @ONLY)
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(NESTED_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
 else()
   if(CMAKE_BUILD_TYPE)
diff --git a/Tests/MissingInstall/CMakeLists.txt b/Tests/MissingInstall/CMakeLists.txt
index 91624f7..365b31f 100644
--- a/Tests/MissingInstall/CMakeLists.txt
+++ b/Tests/MissingInstall/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.12)
+cmake_minimum_required (VERSION 3.9)
 project(TestMissingInstall)
 
 set(CMAKE_SKIP_INSTALL_RULES ON)
@@ -8,11 +8,7 @@ set(CMAKE_SKIP_INSTALL_RULES ON)
 set(CMAKE_SKIP_INSTALL_ALL_DEPENDENCY 1)
 set(CMAKE_SKIP_PACKAGE_ALL_DEPENDENCY 1)
 
-if(CMAKE_CONFIGURATION_TYPES)
-  set(MULTI_CONFIG ON)
-else()
-  set(MULTI_CONFIG OFF)
-endif()
+get_property(MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
 
 add_executable(mybin mybin.cpp)
 install(TARGETS mybin RUNTIME DESTINATION bin)
diff --git a/Tests/OutDir/CMakeLists.txt b/Tests/OutDir/CMakeLists.txt
index 88468c3..823ab08 100644
--- a/Tests/OutDir/CMakeLists.txt
+++ b/Tests/OutDir/CMakeLists.txt
@@ -1,7 +1,8 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.9)
 project(OutDir C)
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   foreach(config ${CMAKE_CONFIGURATION_TYPES})
     string(TOUPPER "${config}" CONFIG)
     list(APPEND configs "${CONFIG}")
diff --git a/Tests/PrecompiledHeader/CMakeLists.txt b/Tests/PrecompiledHeader/CMakeLists.txt
index a804538..58f4863 100644
--- a/Tests/PrecompiledHeader/CMakeLists.txt
+++ b/Tests/PrecompiledHeader/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 3.9)
 project(PrecompiledHeader C)
 
 # Make sure the proper compiler is in use.
@@ -7,7 +7,8 @@ if(NOT MSVC AND NOT CMAKE_C_COMPILER_ID STREQUAL "Intel")
 endif()
 
 # Compute a custom name for the precompiled header.
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(PCH_DIR "${CMAKE_CURRENT_BINARY_DIR}/PCH/${CMAKE_CFG_INTDIR}")
   foreach(cfg ${CMAKE_CONFIGURATION_TYPES})
     file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/PCH/${cfg})
diff --git a/Tests/Qt4Deploy/CMakeLists.txt b/Tests/Qt4Deploy/CMakeLists.txt
index 646ea9f..c73a38c 100644
--- a/Tests/Qt4Deploy/CMakeLists.txt
+++ b/Tests/Qt4Deploy/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.9)
 
 project(Qt4Deploy)
 set(CMAKE_INSTALL_PREFIX ${CMAKE_CURRENT_BINARY_DIR}/install)
@@ -10,7 +10,8 @@ add_executable(testdeploy MACOSX_BUNDLE testdeploy.cpp)
 target_link_libraries(testdeploy ${QT_LIBRARIES})
 set_target_properties(testdeploy PROPERTIES INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}")
 
-if(CMAKE_CONFIGURATION_TYPES AND QT_QTCORE_LIBRARY_RELEASE AND QT_QTCORE_LIBRARY_DEBUG)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig AND QT_QTCORE_LIBRARY_RELEASE AND QT_QTCORE_LIBRARY_DEBUG)
   # note: installing debug Qt libraries from a Qt installation configured with
   # -debug-and-release not yet supported (very low priority).
   install(CODE "
@@ -58,7 +59,7 @@ if(QT_QSQLITE_PLUGIN_DEBUG OR QT_QSQLITE_PLUGIN_RELEASE)
   endif()
 
   # custom target to install and test the installation at build time
-  if(CMAKE_CONFIGURATION_TYPES)
+  if(_isMultiConfig)
     set(install_config "-DCMAKE_INSTALL_CONFIG_NAME=${CMAKE_CFG_INTDIR}")
   endif()
 
diff --git a/Tests/QtAutogen/Complex/CMakeLists.txt b/Tests/QtAutogen/Complex/CMakeLists.txt
index e9feea0..a18cc04 100644
--- a/Tests/QtAutogen/Complex/CMakeLists.txt
+++ b/Tests/QtAutogen/Complex/CMakeLists.txt
@@ -36,7 +36,8 @@ add_custom_command(
   DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/myotherinterface.h.in"
 )
 
-if (NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_GENERATOR STREQUAL Ninja)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig AND NOT CMAKE_GENERATOR STREQUAL Ninja)
   set(debug_srcs "$<$<CONFIG:Debug>:debug_class.cpp>" $<$<CONFIG:Debug>:debug_resource.qrc>)
   set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS $<$<CONFIG:Debug>:TEST_DEBUG_CLASS>)
 endif()
diff --git a/Tests/QtAutogen/TestMacros.cmake b/Tests/QtAutogen/TestMacros.cmake
index 966f3b8..bc7c7e2 100644
--- a/Tests/QtAutogen/TestMacros.cmake
+++ b/Tests/QtAutogen/TestMacros.cmake
@@ -1,6 +1,6 @@
 # Autogen build options
 set(Autogen_BUILD_OPTIONS "-DQT_TEST_VERSION=${QT_TEST_VERSION}")
-if(NOT CMAKE_CONFIGURATION_TYPES)
+if(NOT _isMultiConfig)   # Set in Tests/CMakeLists.txt
   list(APPEND Autogen_BUILD_OPTIONS "-DCMAKE_BUILD_TYPE=$<CONFIGURATION>")
 endif()
 list(APPEND Autogen_BUILD_OPTIONS
diff --git a/Tests/QtAutogen/UicInterface/CMakeLists.txt b/Tests/QtAutogen/UicInterface/CMakeLists.txt
index a216aff..e0421a2 100644
--- a/Tests/QtAutogen/UicInterface/CMakeLists.txt
+++ b/Tests/QtAutogen/UicInterface/CMakeLists.txt
@@ -35,8 +35,8 @@ set_property(TARGET KI18n APPEND PROPERTY
 
 # END upstream
 
-get_property(_GENERATOR_IS_MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
-if(_GENERATOR_IS_MULTI_CONFIG)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
 set(INC_DIR "include_$<CONFIG>" )
 else()
 set(INC_DIR "include" )
diff --git a/Tests/RunCMake/AutoExportDll/RunCMakeTest.cmake b/Tests/RunCMake/AutoExportDll/RunCMakeTest.cmake
index f268de7..27a609d 100644
--- a/Tests/RunCMake/AutoExportDll/RunCMakeTest.cmake
+++ b/Tests/RunCMake/AutoExportDll/RunCMakeTest.cmake
@@ -12,7 +12,7 @@ if("${RunCMake_GENERATOR}" MATCHES "Watcom WMake|Borland Makefiles")
 endif()
 # we build debug so the say.exe will be found in Debug/say.exe for
 # Visual Studio generators
-if("${RunCMake_GENERATOR}" MATCHES "Visual Studio|Xcode")
+if(RunCMake_GENERATOR_IS_MULTI_CONFIG)
   set(INTDIR "Debug/")
 endif()
 # build AutoExport
diff --git a/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake b/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
index 1bf8fbc..3445beb 100644
--- a/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
+++ b/Tests/RunCMake/BuildDepends/RunCMakeTest.cmake
@@ -11,7 +11,7 @@ function(run_BuildDepends CASE)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/${CASE}-build)
   set(RunCMake_TEST_NO_CLEAN 1)
-  if(RunCMake_GENERATOR MATCHES "Make|Ninja")
+  if(NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
     set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Debug)
   endif()
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
diff --git a/Tests/RunCMake/CMP0060/CMP0060-Common.cmake b/Tests/RunCMake/CMP0060/CMP0060-Common.cmake
index e0a56e6..06955ee 100644
--- a/Tests/RunCMake/CMP0060/CMP0060-Common.cmake
+++ b/Tests/RunCMake/CMP0060/CMP0060-Common.cmake
@@ -1,6 +1,7 @@
 # Always build in a predictable configuration.  For multi-config
 # generators we depend on RunCMakeTest.cmake to do this for us.
-if(NOT CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig)
   set(CMAKE_BUILD_TYPE Debug)
 endif()
 
diff --git a/Tests/RunCMake/CMP0060/CMP0060-WARN-ON-stderr.txt b/Tests/RunCMake/CMP0060/CMP0060-WARN-ON-stderr.txt
index f6cc978..e2c280e 100644
--- a/Tests/RunCMake/CMP0060/CMP0060-WARN-ON-stderr.txt
+++ b/Tests/RunCMake/CMP0060/CMP0060-WARN-ON-stderr.txt
@@ -12,5 +12,5 @@
   will ask the linker to search for these by library name.
 Call Stack \(most recent call first\):
   CMP0060-WARN-ON.cmake:[0-9]+ \(include\)
-  CMakeLists.txt:3 \(include\)
+  CMakeLists.txt:4 \(include\)
 This warning is for project developers.  Use -Wno-dev to suppress it.$
diff --git a/Tests/RunCMake/CMP0060/CMakeLists.txt b/Tests/RunCMake/CMP0060/CMakeLists.txt
index db6b701..291d34d 100644
--- a/Tests/RunCMake/CMP0060/CMakeLists.txt
+++ b/Tests/RunCMake/CMP0060/CMakeLists.txt
@@ -1,3 +1,4 @@
-cmake_minimum_required(VERSION 3.2)
+cmake_minimum_required(VERSION 3.9)
+cmake_policy(VERSION 3.2)
 project(${RunCMake_TEST} C)
 include(${RunCMake_TEST}.cmake)
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index aa075b0..8eb8568 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -1,5 +1,8 @@
 # See adjacent README.rst for documentation of this test infrastructure.
 
+# Note that the _isMultiConfig variable is set in the parent directory's
+# CMakeLists.txt (slightly complex logic to support CMake versions before 3.9)
+
 macro(add_RunCMake_test test)
   set(TEST_ARGS ${ARGN})
   if ("${ARGV1}" STREQUAL "TEST_DIR")
@@ -14,6 +17,7 @@ macro(add_RunCMake_test test)
   endif()
   add_test(NAME RunCMake.${test} COMMAND ${CMAKE_CMAKE_COMMAND}
     -DCMAKE_MODULE_PATH=${CMAKE_CURRENT_SOURCE_DIR}
+    -DRunCMake_GENERATOR_IS_MULTI_CONFIG=${_isMultiConfig}
     -DRunCMake_GENERATOR=${CMAKE_GENERATOR}
     -DRunCMake_GENERATOR_INSTANCE=${CMAKE_GENERATOR_INSTANCE}
     -DRunCMake_GENERATOR_PLATFORM=${CMAKE_GENERATOR_PLATFORM}
@@ -47,6 +51,7 @@ function(add_RunCMake_test_group test types)
       add_test(NAME RunCMake.${test}_${type} COMMAND ${CMAKE_CMAKE_COMMAND}
         -DTEST_TYPE=${type}
         -DCMAKE_MODULE_PATH=${CMAKE_CURRENT_SOURCE_DIR}
+        -DRunCMake_GENERATOR_IS_MULTI_CONFIG=${_isMultiConfig}
         -DRunCMake_GENERATOR=${CMAKE_GENERATOR}
         -DRunCMake_GENERATOR_INSTANCE=${CMAKE_GENERATOR_INSTANCE}
         -DRunCMake_GENERATOR_PLATFORM=${CMAKE_GENERATOR_PLATFORM}
diff --git a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_ARGS.cmake b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_ARGS.cmake
index 1f76fd0..dcb992d 100644
--- a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_ARGS.cmake
+++ b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_ARGS.cmake
@@ -1,4 +1,5 @@
-if(NOT CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig)
   set(CMAKE_BUILD_TYPE Debug)
 endif()
 include(ExternalProject)
diff --git a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_DEFAULT_ARGS.cmake b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_DEFAULT_ARGS.cmake
index 1b619c8..4b4b40e 100644
--- a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_DEFAULT_ARGS.cmake
+++ b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_DEFAULT_ARGS.cmake
@@ -1,4 +1,5 @@
-if(NOT CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig)
   set(CMAKE_BUILD_TYPE Debug)
 endif()
 include(ExternalProject)
diff --git a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_mix.cmake b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_mix.cmake
index 192776b..2fb0705 100644
--- a/Tests/RunCMake/ExternalProject/CMAKE_CACHE_mix.cmake
+++ b/Tests/RunCMake/ExternalProject/CMAKE_CACHE_mix.cmake
@@ -1,4 +1,5 @@
-if(NOT CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig)
   set(CMAKE_BUILD_TYPE Debug)
 endif()
 include(ExternalProject)
diff --git a/Tests/RunCMake/ExternalProject/UsesTerminal.cmake b/Tests/RunCMake/ExternalProject/UsesTerminal.cmake
index cd87403..d3494fd 100644
--- a/Tests/RunCMake/ExternalProject/UsesTerminal.cmake
+++ b/Tests/RunCMake/ExternalProject/UsesTerminal.cmake
@@ -1,4 +1,5 @@
-if(NOT CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(NOT _isMultiConfig)
   set(CMAKE_BUILD_TYPE Debug)
 endif()
 include(ExternalProject)
diff --git a/Tests/RunCMake/File_Generate/RunCMakeTest.cmake b/Tests/RunCMake/File_Generate/RunCMakeTest.cmake
index 616e210..94aaca8 100644
--- a/Tests/RunCMake/File_Generate/RunCMakeTest.cmake
+++ b/Tests/RunCMake/File_Generate/RunCMakeTest.cmake
@@ -5,7 +5,7 @@ run_cmake(CMP0070-OLD)
 run_cmake(CMP0070-WARN)
 
 run_cmake(CommandConflict)
-if("${RunCMake_GENERATOR}" MATCHES "Visual Studio|Xcode")
+if(RunCMake_GENERATOR_IS_MULTI_CONFIG)
   run_cmake(OutputConflict)
 endif()
 run_cmake(EmptyCondition1)
diff --git a/Tests/RunCMake/GenerateExportHeader/RunCMakeTest.cmake b/Tests/RunCMake/GenerateExportHeader/RunCMakeTest.cmake
index 9423ef5..55625a8 100644
--- a/Tests/RunCMake/GenerateExportHeader/RunCMakeTest.cmake
+++ b/Tests/RunCMake/GenerateExportHeader/RunCMakeTest.cmake
@@ -4,7 +4,7 @@ function(run_GEH)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/GEH-build)
   set(RunCMake_TEST_NO_CLEAN 1)
-  if(RunCMake_GENERATOR MATCHES "Make|Ninja")
+  if(NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
     set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Debug)
   endif()
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
diff --git a/Tests/RunCMake/GeneratorExpression/ValidTarget-TARGET_PDB_FILE.cmake b/Tests/RunCMake/GeneratorExpression/ValidTarget-TARGET_PDB_FILE.cmake
index 38e47f9..a66394b 100644
--- a/Tests/RunCMake/GeneratorExpression/ValidTarget-TARGET_PDB_FILE.cmake
+++ b/Tests/RunCMake/GeneratorExpression/ValidTarget-TARGET_PDB_FILE.cmake
@@ -3,7 +3,8 @@ enable_language(C)
 
 add_library(empty SHARED empty.c)
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   list(GET CMAKE_CONFIGURATION_TYPES 0 FIRST_CONFIG)
   set(GENERATE_CONDITION CONDITION $<CONFIG:${FIRST_CONFIG}>)
 endif()
diff --git a/Tests/RunCMake/GoogleTest/RunCMakeTest.cmake b/Tests/RunCMake/GoogleTest/RunCMakeTest.cmake
index 73014d1..209e769 100644
--- a/Tests/RunCMake/GoogleTest/RunCMakeTest.cmake
+++ b/Tests/RunCMake/GoogleTest/RunCMakeTest.cmake
@@ -4,7 +4,7 @@ function(run_GoogleTest)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/GoogleTest-build)
   set(RunCMake_TEST_NO_CLEAN 1)
-  if(RunCMake_GENERATOR MATCHES "Make|Ninja")
+  if(NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
     set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Debug)
   endif()
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
diff --git a/Tests/RunCMake/RuntimePath/RunCMakeTest.cmake b/Tests/RunCMake/RuntimePath/RunCMakeTest.cmake
index a9a7f05..3f238f2 100644
--- a/Tests/RunCMake/RuntimePath/RunCMakeTest.cmake
+++ b/Tests/RunCMake/RuntimePath/RunCMakeTest.cmake
@@ -5,7 +5,7 @@ function(run_SymlinkImplicit)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/SymlinkImplicit-build)
   set(RunCMake_TEST_NO_CLEAN 1)
-  if(RunCMake_GENERATOR MATCHES "Make|Ninja")
+  if(NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
     set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Debug)
   endif()
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
diff --git a/Tests/RunCMake/get_property/RunCMakeTest.cmake b/Tests/RunCMake/get_property/RunCMakeTest.cmake
index 017990f..06a0c67 100644
--- a/Tests/RunCMake/get_property/RunCMakeTest.cmake
+++ b/Tests/RunCMake/get_property/RunCMakeTest.cmake
@@ -23,6 +23,10 @@ run_cmake(NoSource)
 run_cmake(NoProperty)
 run_cmake(NoCache)
 
+# Since we are testing the GENERATOR_IS_MULTI_CONFIG property itself,
+# don't rely on RunCMake_GENERATOR_IS_MULTI_CONFIG being set correctly
+# and instead explicitly check for a match against those generators we
+# expect to be multi-config
 if(RunCMake_GENERATOR MATCHES "Visual Studio|Xcode")
   run_cmake(IsMultiConfig)
 else()
diff --git a/Tests/RunCMake/test_include_dirs/RunCMakeTest.cmake b/Tests/RunCMake/test_include_dirs/RunCMakeTest.cmake
index d1633e4..72056ae 100644
--- a/Tests/RunCMake/test_include_dirs/RunCMakeTest.cmake
+++ b/Tests/RunCMake/test_include_dirs/RunCMakeTest.cmake
@@ -4,7 +4,7 @@ function(run_TID)
   # Use a single build tree for a few tests without cleaning.
   set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/TID-build)
   set(RunCMake_TEST_NO_CLEAN 1)
-  if(RunCMake_GENERATOR MATCHES "Make|Ninja")
+  if(NOT RunCMake_GENERATOR_IS_MULTI_CONFIG)
     set(RunCMake_TEST_OPTIONS -DCMAKE_BUILD_TYPE=Debug)
   endif()
   file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
diff --git a/Tests/SimpleInstall/CMakeLists.txt b/Tests/SimpleInstall/CMakeLists.txt
index b6a472e..a07f687 100644
--- a/Tests/SimpleInstall/CMakeLists.txt
+++ b/Tests/SimpleInstall/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 3.9)
 project (TestSimpleInstall)
 set(CMAKE_VERBOSE_MAKEFILE 1)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
@@ -307,7 +307,8 @@ else()
         INSTALL_NAME_DIR @executable_path/../lib)
 endif()
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(SI_CONFIG --config $<CONFIGURATION>)
 else()
   set(SI_CONFIG)
diff --git a/Tests/SimpleInstallS2/CMakeLists.txt b/Tests/SimpleInstallS2/CMakeLists.txt
index ea2701e..22150ca 100644
--- a/Tests/SimpleInstallS2/CMakeLists.txt
+++ b/Tests/SimpleInstallS2/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 3.9)
 project (TestSimpleInstall)
 set(CMAKE_VERBOSE_MAKEFILE 1)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
@@ -307,7 +307,8 @@ else()
         INSTALL_NAME_DIR @executable_path/../lib)
 endif()
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(SI_CONFIG --config $<CONFIGURATION>)
 else()
   set(SI_CONFIG)
diff --git a/Tests/StagingPrefix/CMakeLists.txt b/Tests/StagingPrefix/CMakeLists.txt
index 49ff7fe..64a3cd2 100644
--- a/Tests/StagingPrefix/CMakeLists.txt
+++ b/Tests/StagingPrefix/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.9)
 project(StagingPrefix)
 
 # Wipe out the install tree
@@ -17,7 +17,8 @@ set_property(
   PROPERTY SYMBOLIC 1
   )
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(NESTED_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
 else()
   if(CMAKE_BUILD_TYPE)
diff --git a/Tests/VSGNUFortran/CMakeLists.txt b/Tests/VSGNUFortran/CMakeLists.txt
index 229c315..993d0d6 100644
--- a/Tests/VSGNUFortran/CMakeLists.txt
+++ b/Tests/VSGNUFortran/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.9)
 project(VSGNUFortran)
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
@@ -9,7 +9,8 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")
 # because gmake build of fortran will not be in a config
 # directory, and for easier testing we want the exe and .dll
 # to be in the same directory.
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   foreach(config ${CMAKE_CONFIGURATION_TYPES})
     string(TOUPPER "${config}" config)
     set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_${config}