From f0165eb624403c26989d1039c076d61536cc3074 Mon Sep 17 00:00:00 2001
From: "Daniele E. Domenichelli" <ddomenichelli@drdanz.it>
Date: Fri, 20 Jan 2017 19:02:29 +0100
Subject: FeatureSummary: Allow lists of dependencies in ADD_FEATURE_INFO

---
 Modules/FeatureSummary.cmake                               | 14 ++++++++++++--
 .../FeatureSummaryMultipleDepends-stdout.txt               | 10 ++++++++++
 .../FeatureSummary/FeatureSummaryMultipleDepends.cmake     | 12 ++++++++++++
 Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake           |  1 +
 4 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends-stdout.txt
 create mode 100644 Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends.cmake

diff --git a/Modules/FeatureSummary.cmake b/Modules/FeatureSummary.cmake
index dce0330..490c956 100644
--- a/Modules/FeatureSummary.cmake
+++ b/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 ()
diff --git a/Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends-stdout.txt b/Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends-stdout.txt
new file mode 100644
index 0000000..d5875e0
--- /dev/null
+++ b/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\.
diff --git a/Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends.cmake b/Tests/RunCMake/FeatureSummary/FeatureSummaryMultipleDepends.cmake
new file mode 100644
index 0000000..f355ae7
--- /dev/null
+++ b/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)
diff --git a/Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake b/Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake
index 585a6ee..97c23f9 100644
--- a/Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake
+++ b/Tests/RunCMake/FeatureSummary/RunCMakeTest.cmake
@@ -13,3 +13,4 @@ run_cmake(FeatureSummaryTypes)
 run_cmake(FeatureSummaryFatalOnMissingRequiredPackages)
 run_cmake(FeatureSummaryIncludeQuietPackages)
 run_cmake(FeatureSummaryQuietOnEmpty)
+run_cmake(FeatureSummaryMultipleDepends)
-- 
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