Makefile: Optionally disable target completion messages in build output

Add a TARGET_MESSAGES property to control whether Makefile targets print
the "Built target " completion messages.  Default to ON to preserve
existing behavior.

Help/manual/cmake-properties.7.rst

@@ -40,6 +40,7 @@ Properties of Global Scope
    /prop_gbl/RULE_LAUNCH_LINK
    /prop_gbl/RULE_MESSAGES
    /prop_gbl/TARGET_ARCHIVES_MAY_BE_SHARED_LIBS
+   /prop_gbl/TARGET_MESSAGES
    /prop_gbl/TARGET_SUPPORTS_SHARED_LIBS
    /prop_gbl/USE_FOLDERS
 

Help/prop_gbl/TARGET_MESSAGES.rst

@@ -0,0 +1,20 @@
+TARGET_MESSAGES
+---------------
+
+Specify whether to report the completion of each target.
+
+This property specifies whether :ref:`Makefile Generators` should
+add a progress message describing that each target has been completed.
+If the property is not set the default is ``ON``.  Set the property
+to ``OFF`` to disable target completion messages.
+
+This option is intended to reduce build output when little or no
+work needs to be done to bring the build tree up to date.
+
+If a ``CMAKE_TARGET_MESSAGES`` cache entry exists its value
+initializes the value of this property.
+
+Non-Makefile generators currently ignore this property.
+
+See the counterpart property :prop_gbl:`RULE_MESSAGES` to disable
+everything except for target completion messages.

Help/release/dev/makefile-target-messages.rst

@@ -0,0 +1,6 @@
+makefile-target-messages
+------------------------
+
+* A :prop_gbl:`TARGET_MESSAGES` global property was added to tell the
+  :ref:`Makefile Generators` whether to generate commands to print output
+  after each target is completed.

Modules/CMakeGenericSystem.cmake

@@ -52,6 +52,9 @@ if(CMAKE_GENERATOR MATCHES "Make")
   if(DEFINED CMAKE_RULE_MESSAGES)
     set_property(GLOBAL PROPERTY RULE_MESSAGES ${CMAKE_RULE_MESSAGES})
   endif()
+  if(DEFINED CMAKE_TARGET_MESSAGES)
+    set_property(GLOBAL PROPERTY TARGET_MESSAGES ${CMAKE_TARGET_MESSAGES})
+  endif()
   if(CMAKE_GENERATOR MATCHES "Unix Makefiles")
     set(CMAKE_EXPORT_COMPILE_COMMANDS OFF CACHE BOOL
       "Enable/Disable output of compile commands during generation."

Source/cmGlobalUnixMakefileGenerator3.cxx

@@ -801,8 +801,20 @@ cmGlobalUnixMakefileGenerator3
         }
       progress.Arg = progressArg.str();
       }
-      lg->AppendEcho(commands, "Built target " + name,
+
-        cmLocalUnixMakefileGenerator3::EchoNormal, &progress);
+      bool targetMessages = true;
+      if (const char* tgtMsg = this->GetCMakeInstance()
+                                   ->GetState()
+                                   ->GetGlobalProperty("TARGET_MESSAGES"))
+        {
+        targetMessages = cmSystemTools::IsOn(tgtMsg);
+        }
+
+      if (targetMessages)
+        {
+        lg->AppendEcho(commands, "Built target " + name,
+          cmLocalUnixMakefileGenerator3::EchoNormal, &progress);
+        }
 
       this->AppendGlobalTargetDepends(depends, gtarget);
       lg->WriteMakeRule(ruleFileStream, "All Build rule for target.",