Add 'ANDROID_GUI' target property to mark Android applications

Also add a 'CMAKE_ANDROID_GUI' variable to set the property default
so a project can easily make all executables Android applications.
An Android application executable file has the same extension as a
shared library (.so).

Help/manual/cmake-properties.7.rst

@@ -79,6 +79,7 @@ Properties on Targets
    :maxdepth: 1
 
    /prop_tgt/ALIASED_TARGET
+   /prop_tgt/ANDROID_GUI
    /prop_tgt/ARCHIVE_OUTPUT_DIRECTORY_CONFIG
    /prop_tgt/ARCHIVE_OUTPUT_DIRECTORY
    /prop_tgt/ARCHIVE_OUTPUT_NAME_CONFIG

Help/manual/cmake-variables.7.rst

@@ -204,6 +204,7 @@ Variables that Control the Build
 .. toctree::
    :maxdepth: 1
 
+   /variable/CMAKE_ANDROID_GUI
    /variable/CMAKE_ARCHIVE_OUTPUT_DIRECTORY
    /variable/CMAKE_AUTOMOC_MOC_OPTIONS
    /variable/CMAKE_AUTOMOC

Help/prop_tgt/ANDROID_GUI.rst

@@ -0,0 +1,9 @@
+ANDROID_GUI
+-----------
+
+Build an executable as an application package on Android.
+
+When this property is set to true the executable when built for Android
+will be created as an application package.  This property is initialized
+by the value of the :variable:`CMAKE_ANDROID_GUI` variable if it is set
+when a target is created.

Help/variable/CMAKE_ANDROID_GUI.rst

@@ -0,0 +1,5 @@
+CMAKE_ANDROID_GUI
+-----------------
+
+Default value for the :prop_tgt:`ANDROID_GUI` target property of
+executables.  See that target property for additional information.

Source/cmTarget.cxx

@@ -446,6 +446,10 @@ void cmTarget::SetMakefile(cmMakefile* mf)
     this->SetPropertyDefault("VISIBILITY_INLINES_HIDDEN", 0);
     }
 
+  if(this->TargetTypeValue == cmTarget::EXECUTABLE)
+    {
+    this->SetPropertyDefault("ANDROID_GUI", 0);
+    }
   if(this->TargetTypeValue == cmTarget::SHARED_LIBRARY
       || this->TargetTypeValue == cmTarget::MODULE_LIBRARY)
     {
@@ -3504,7 +3508,10 @@ const char* cmTarget::GetSuffixVariableInternal(bool implib) const
     case cmTarget::EXECUTABLE:
       return (implib
               ? "CMAKE_IMPORT_LIBRARY_SUFFIX"
-              : "CMAKE_EXECUTABLE_SUFFIX");
+                // Android GUI application packages store the native
+                // binary as a shared library.
+              : (this->IsAndroid && this->GetPropertyAsBool("ANDROID_GUI")?
+                 "CMAKE_SHARED_LIBRARY_SUFFIX" : "CMAKE_EXECUTABLE_SUFFIX"));
     default:
       break;
     }
@@ -3528,7 +3535,12 @@ const char* cmTarget::GetPrefixVariableInternal(bool implib) const
               ? "CMAKE_IMPORT_LIBRARY_PREFIX"
               : "CMAKE_SHARED_MODULE_PREFIX");
     case cmTarget::EXECUTABLE:
-      return (implib? "CMAKE_IMPORT_LIBRARY_PREFIX" : "");
+      return (implib
+              ? "CMAKE_IMPORT_LIBRARY_PREFIX"
+                // Android GUI application packages store the native
+                // binary as a shared library.
+              : (this->IsAndroid && this->GetPropertyAsBool("ANDROID_GUI")?
+                 "CMAKE_SHARED_LIBRARY_PREFIX" : ""));
     default:
       break;
     }