FeatureSummary: Allow lists of dependencies in ADD_FEATURE_INFO

Modules/FeatureSummary.cmake

@@ -477,7 +477,8 @@ endfunction()
     add_feature_info(<name> <enabled> <description>)
 
   Use this macro to add information about a feature with the given ``<name>``.
-  ``<enabled>`` contains whether this feature is enabled or not.
+  ``<enabled>`` contains whether this feature is enabled or not. It can be a
+  variable or a list of conditions.
   ``<description>`` is a text describing the feature.  The information can
   be displayed using ``feature_summary()`` for ``ENABLED_FEATURES`` and
   ``DISABLED_FEATURES`` respectively.
@@ -489,7 +490,16 @@ endfunction()
      option(WITH_FOO "Help for foo" ON)
      add_feature_info(Foo WITH_FOO "The Foo feature provides very cool stuff.")
 #]=======================================================================]
-function(ADD_FEATURE_INFO _name _enabled _desc)
+function(ADD_FEATURE_INFO _name _depends _desc)
+  set(_enabled 1)
+  foreach(_d ${_depends})
+    string(REGEX REPLACE " +" ";" _d "${_d}")
+    if(${_d})
+    else()
+      set(_enabled 0)
+      break()
+    endif()
+  endforeach()
   if (${_enabled})
     set_property(GLOBAL APPEND PROPERTY ENABLED_FEATURES "${_name}")
   else ()

Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends-stdout.txt

@@ -0,0 +1,10 @@
+-- The following features have been enabled:
+
+ \* Bar, Bar\.
+ \* Baz, Baz\.
+ \* Goo, Goo\.
+
+-- The following features have been disabled:
+
+ \* Foo, Foo\.
+ \* Fez, Fez\.

Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends.cmake

@@ -0,0 +1,12 @@
+include(FeatureSummary)
+
+set(WITH_FOO 1)
+set(WITH_BAR 0)
+
+add_feature_info(Foo "WITH_FOO;WITH_BAR" "Foo.")
+add_feature_info(Bar "WITH_FOO;NOT WITH_BAR" "Bar.")
+add_feature_info(Baz "WITH_FOO AND NOT WITH_BAR" "Baz.")
+add_feature_info(Goo "WITH_FOO OR WITH_BAR" "Goo.")
+add_feature_info(Fez "NOT WITH_FOO OR WITH_BAR" "Fez.")
+
+feature_summary(WHAT ALL)

Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake

@@ -13,3 +13,4 @@ run_cmake(FeatureSummaryTypes)
 run_cmake(FeatureSummaryFatalOnMissingRequiredPackages)
 run_cmake(FeatureSummaryIncludeQuietPackages)
 run_cmake(FeatureSummaryQuietOnEmpty)
+run_cmake(FeatureSummaryMultipleDepends)